U.S. patent application number 14/354950 was filed with the patent office on 2016-05-26 for low-lead bismuth-free silicon-free brass.
The applicant listed for this patent is JiaXing IDC Plumbing & Heating Technology Ltd., ZheJiang IDC Fluid Control Co., Ltd.. Invention is credited to Jiade LI.
Application Number | 20160145719 14/354950 |
Document ID | / |
Family ID | 53493075 |
Filed Date | 2016-05-26 |
United States Patent
Application |
20160145719 |
Kind Code |
A1 |
LI; Jiade |
May 26, 2016 |
LOW-LEAD BISMUTH-FREE SILICON-FREE BRASS
Abstract
The invention relates to a low-lead bismuth-free silicon-free
brass alloy with excellent cutting performance, comprising, by the
total weight of the brass alloy, 60-65 wt % copper, 0.1-0.25 wt %
lead, 0.1-0.7 wt % aluminum, 0.05-0.5 wt % tin, one or more element
selected from the group consisting of 0.05-0.3 wt % phosphorus,
0.05-0.5 wt % manganese and 0.001-0.01 wt % boron, and a balance of
zinc.
Inventors: |
LI; Jiade; (Yuhuan,
CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
JiaXing IDC Plumbing & Heating Technology Ltd.
ZheJiang IDC Fluid Control Co., Ltd. |
Haiyan
Yuhuan |
|
CN
CN |
|
|
Family ID: |
53493075 |
Appl. No.: |
14/354950 |
Filed: |
April 9, 2014 |
PCT Filed: |
April 9, 2014 |
PCT NO: |
PCT/CN2014/074938 |
371 Date: |
April 29, 2014 |
Current U.S.
Class: |
420/472 |
Current CPC
Class: |
C22C 1/02 20130101; C22F
1/08 20130101; C22C 9/04 20130101 |
International
Class: |
C22C 9/04 20060101
C22C009/04 |
Foreign Application Data
Date |
Code |
Application Number |
Jan 3, 2014 |
CN |
201410003999.5 |
Claims
1. A low-lead bismuth-free silicon-free brass alloy with excellent
cutting performance, characterized by comprising: by the total
weight of the brass alloy, 60-65 wt % copper, 0.1-0.25 wt % lead,
0.1-0.7 wt % aluminum and 0.05-0.5 wt % tin, and a balance of
zinc.
2. The brass alloy of claim 1, characterized by further comprising
0.05-0.5 wt % manganese and/or 0.05-0.3 wt % phosphorus by the
total weight of the brass alloy.
3. The brass alloy of claim 1, characterized by further comprising
one or more element selected from the group consisting of 0.05-0.3
wt % phosphorus, 0.05-0.5 wt % manganese and 0.001-0.01 wt % boron
by the total weight of the brass alloy.
4. The brass alloy of claim 1, characterized by further comprising
0.05-0.3 wt % phosphorus, 0.05-0.5 wt % manganese and 0.001-0.01 wt
% boron by the total weight of the brass alloy.
5. The brass alloy of claim 4, characterized by further comprising:
unavoidable impurities which comprise, by the total weight of the
brass alloy, 0.25 wt % or less nickel, 0.15 wt % or less chrome
and/or 0.25 wt % or less iron.
6. The brass alloy of claim 4, characterized in that a total
content of manganese, aluminum, tin, phosphorus and boron is not
larger than 2 wt % of the total weight of the brass alloy.
7. The brass alloy of claim 6, characterized in that the total
content of manganese, aluminum, tin, phosphorus and boron is not
less than 0.1 wt % of the total weight of the brass alloy.
8. A low-lead bismuth-free silicon-free brass alloy with excellent
cutting performance, characterized by comprising: by the total
weight of the brass alloy, 60-65 wt % copper, 0.1-0.25 wt % lead,
two or more elements selected from the group consisting of 0.1-0.7
wt % aluminum, 0.05-0.5 wt % tin, 0.05-0.3 wt % phosphorus,
0.05-0.5 wt % manganese and 0.001-0.01 wt % boron, and a balance of
zinc.
9. The brass alloy of claim 8, characterized by further comprising:
unavoidable impurities which comprise, by the total weight of the
brass alloy, 0.25 wt % or less nickel, 0.15 wt % or less chrome
and/or 0.25 wt % or less iron.
10. A low-lead bismuth-free silicon-free brass alloy with excellent
cutting performance, characterized by comprising: 60-65 wt %
copper, 0.1-0.25 wt % lead, 0.05-0.5 wt % tin and 0.05-0.3 wt %
phosphorus by the total weight of the brass alloy, and a balance of
zinc.
11. The brass alloy of claim 10, characterized by further
comprising two or more elements selected from the group consisting
of 0.1-0.7 wt % aluminum, 0.05-0.5 wt % manganese and 0.001-0.01 wt
% boron by the total weight of the brass alloy.
12. The brass alloy of claim 11, characterized by further
comprising: unavoidable impurities which comprise, by the total
weight of the brass alloy, 0.25 wt % or less nickel, 0.15 wt % or
less chrome and/or 0.25 wt % or less iron.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application is the U.S. national phase of International
Application No. PCT/CN2014/074938, filed on Apr. 9, 2014, which
claims the priority benefit a Chinese Patent which is application
No. 2014100039995, filed on Jan. 3, 2014. The entire contents of
which is hereby incorporated by reference.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The invention relates to a low-lead brass alloy, and
particularly to a brass alloy which is both free cutting and
resistant to dezincification.
[0004] 2. Background of Invention
[0005] Generally, the brass for processing is added with metallic
zinc by a percentage of 38-42%. In order to make it easy to process
brass, brass usually contains 2-3% lead to enhance strength and
processability. Lead-containing brass has excellent moldability
(making it easy to fabricate products of various shapes), cutting
performance, and abrasion resistance, so that it is widely applied
to mechanical part with various shapes, accounts for a large
proportion in the copper industry, and is well known as one of the
most important basic material in the world. However, during the
production or use of lead-containing brass, lead tends to dissolve
in the solid or gas state. Medical studies have shown that lead can
bring about substantial damage to the human hematopoietic and
nervous systems, especially children's kidneys and other organs.
Many countries in the world take the pollution and hazard caused by
lead very seriously. The National Sanitation Foundation (NSF) sets
a tolerance of lead element of 0.25% or less. Organizations like
the Restriction of Hazardous Substances Directive (RoHS) of
European Union successively stipulate, restrict and prohibit the
usage of brass with a high lead content.
[0006] Furthermore, when the zinc content in brass exceeds 20 wt %,
the corrosion phenomenon of dezincification is prone to occur.
Especially when brass is exposed to the chloride rich environment,
e.g. marine environment, the occurrence of corrosion phenomenon of
dezincification may be accelerated. Dezincification may severely
destroy the structure of brass alloy, so that the surface strength
of brass products is reduced and the brass tube even perforates.
This greatly reduces the lifetime of brass products and causes
problems in application.
[0007] Therefore, there is a need to provide an alloy formula for
solving the above problems, which can replace the brass with a high
lead content, is dezincification corrosion resistant, and further
has excellent casting performance, forgeability, cutting
performance, corrosion resistance and mechanical properties.
BRIEF SUMMARY OF THE INVENTION
[0008] As known in the prior art, silicon may appear in the alloy
metallographic structure as .gamma. phase (sometimes as .kappa.
phase). In this case, silicon may replace the function of lead in
the alloy to an extent, and improve cutting performance of the
alloy. Cutting performance of the alloy increases with the content
of silicon. However, silicon has a high melting point and a low
specific gravity and is prone to be oxidized. As a result, after
silicon monomer is added into the furnace in the alloy melting
process, silicon floats on the surface of alloy. When the alloy is
melt, silicon will be oxidized into silicon oxides or other oxides,
making it difficult to produce silicon-containing copper alloy. In
case silicon is added in the form of Cu--Si alloy, the economic
cost is increased.
[0009] Bismuth can be added to replace lead for forming cutting
breakpoints in the alloy structure to improve cutting performance.
However, thermal cracking is prone to occur during forging in case
of a high bismuth content, which is not conducive for
producing.
[0010] Thus, it is an object of the invention to provide a brass
alloy which exhibits excellent performance like tensile strength,
elongation rate, dezincification resistance and cutting
performance, which is suitable for cutting processed products that
require high strength and wear resistance, and which is suitable
for constituent materials for forged products and cast products.
The brass alloy of the invention can securely replace the alloy
copper with a high lead content, and can completely meet the
demands about restrictions on lead-containing products in the
development of human society.
[0011] To achieve the above object, the inventors have proposed the
following low-lead bismuth-free silicon-free brass alloys.
[0012] A low-lead bismuth-free silicon-free brass alloy with
excellent cutting performance (hereinafter referred to as the
inventive product 1) comprises, by the total weight of the brass
alloy, 60-65 wt % copper, 0.1-0.25 wt % lead, 0.1-0.7 wt %
aluminum, 0.05-0.5 wt % tin, and a balance of zinc.
[0013] In the inventive product 1, the content of lead is reduced
to 0.1-0.25 wt %, the content of copper is controlled at 60-65 wt
%, and a small quantity of aluminum and tin is added to improve
cutting performance of the alloy. The metallographic structure of
the alloy mainly comprises a phase, .beta. phase, .gamma. phase,
and soft and brittle intermetallic compounds which are distributed
in grain boundaries or grains. Copper and zinc make main
constituents of the brass alloy.
[0014] Adding tin into the alloy can form .gamma. phase, thus
increasing cutting performance of the alloy. In addition, the
addition of tin obviously increases strength, plasticity, and
corrosion resistance of the alloy. However, since adding tin may
increase cost, aluminum is added along with tin. As a result, not
only cutting performance of the alloy can be improved, but also
strength, wear resistance, cast flowability, and high temperature
oxidation resistance of the alloy can be increased. In order to
make a better use of the above effects, the content of tin and
aluminum is 0.05-0.5 wt % and 0.1-0.7 wt %, respectively.
[0015] A low-lead bismuth-free silicon-free brass alloy with
excellent cutting performance (hereinafter referred to as the
inventive product 2) comprises, by the total weight of the brass
alloy, 60-65 wt % copper, 0.1-0.25 wt % lead, 0.1-0.7 wt %
aluminum, 0.05-0.5 wt % tin, and further comprises 0.05-0.5 wt %
manganese and/or 0.05-0.3 wt % phosphorus, and a balance of
zinc.
[0016] As compared with the inventive product 1, the inventive
product 2 is further added with 0.05-0.3 wt % phosphorus and/or
0.05-0.5 wt % manganese. Although phosphorus can't form .gamma.
phase, phosphorus has a function of facilitating a good
distribution of .gamma. phase, thus increasing cutting performance
of the alloy. Meanwhile, in case phosphorus is added, .gamma. phase
will disperse crystal grains of the primary .alpha. phase, thus
increasing casting performance and corrosion resistance of the
alloy. When the content of phosphorus is lower than 0.05 wt %,
phosphorus can not play its role effectively. While when the
content of phosphorus is higher than 0.3 wt %, casting performance
and corrosion resistance will be affected adversely. Adding
manganese helps to improve dezincification resistance and cast
flowability. When the content of manganese is lower than 0.05 wt %,
manganese can not play its role effectively. While when the content
of manganese is 0.5 wt %, manganese can play its role to the
saturation value.
[0017] A low-lead bismuth-free silicon-free brass alloy with
excellent cutting performance (hereinafter referred to as the
inventive product 3) comprises, by the total weight of the brass
alloy, 60-65 wt % copper, 0.1-0.25 wt % lead, 0.1-0.7 wt %
aluminum, 0.05-0.5 wt % tin, and further comprises one or more
element selected from the group consisting of 0.05-0.3 wt %
phosphorus, 0.05-0.5 wt % manganese and 0.001-0.01 wt % boron by
the total weight of the brass alloy, and a balance of zinc.
[0018] As compared with the inventive product 2, the inventive
product 3 is further added with trace boron, so as to better
suppress alloy dezincification, increase the mechanical strength,
and alter defect structure of cuprous oxide film on the surface of
copper alloy, thus forming a cuprous oxide film which is more
uniform, dense, and stain resistant. When the content of boron is
lower than 0.001 wt %, boron can't play its role as mentioned
above. While when the content of boron is higher than 0.01 wt %,
the above performance can't be further increased. Thus, the optimum
content of boron is 0.001-0.01 wt %. The content of phosphorus and
manganese has the same interval as that of the inventive product 2,
and this is based on the same reason as that of the inventive
product 2.
[0019] A low-lead bismuth-free silicon-free brass alloy with
excellent cutting performance (hereinafter referred to as the
inventive product 4) comprises, by the total weight of the brass
alloy, 60-65 wt % copper, 0.1-0.25 wt % lead, 0.1-0.7 wt %
aluminum, 0.05-0.5 wt % tin, 0.05-0.3 wt % phosphorus, and further
comprises 0.05-0.5 wt % manganese and 0.001-0.01 wt % boron, and a
balance of zinc.
[0020] The effects of lead, aluminum, tin, phosphorus, manganese
and boron elements in the brass alloy have been discussed above. By
adding these elements into the brass alloy simultaneously, it is
possible to further increase mechanical performance of alloy so as
to meet needs for products with strict requirements.
[0021] A low-lead bismuth-free silicon-free brass alloy with
excellent cutting performance (hereinafter referred to as the
inventive product 5) comprises, by the total weight of the brass
alloy, 60-65 wt % copper, 0.1-0.25 wt % lead, 0.1-0.7 wt %
aluminum, 0.05-0.5 wt % tin, 0.05-0.3 wt % phosphorus, 0.05-0.5 wt
% manganese and 0.001-0.01 wt % boron, and a balance of zinc, and
further comprises unavoidable impurities which comprise, by the
total weight of the brass alloy, 0.25 wt % or less nickel, 0.15 wt
% or less chrome and/or 0.25 wt % or less iron.
[0022] As compared with the inventive product 4, the inventive
product 5 further comprises some unavoidable impurities, i.e.,
mechanical impurities of nickel, chrome and/or iron.
[0023] A low-lead bismuth-free silicon-free brass alloy with
excellent cutting performance (hereinafter referred to as the
inventive product 6) comprises, by the total weight of the brass
alloy, 60-65 wt % copper, 0.1-0.25 wt % lead, 0.1-0.7 wt %
aluminum, 0.05-0.5 wt % tin, 0.05-0.3 wt % phosphorus, 0.05-0.5 wt
% manganese and 0.001-0.01 wt % boron, and a balance of zinc,
wherein a total content of aluminum, tin, phosphorus, manganese and
boron is not larger than 2 wt % of the total weight of the brass
alloy.
[0024] A low-lead bismuth-free silicon-free brass alloy with
excellent cutting performance (hereinafter referred to as the
inventive product 7) comprises, by the total weight of the brass
alloy, 60-65 wt % copper, 0.1-0.25 wt % lead, 0.1-0.7 wt %
aluminum, 0.05-0.5 wt % tin, 0.05-0.3 wt % phosphorus, 0.05-0.5 wt
% manganese and 0.001-0.01 wt % boron, and a balance of zinc,
wherein a total content of aluminum, tin, phosphorus, manganese and
boron is 0.2-2 wt % of the total weight of the brass alloy.
[0025] A low-lead bismuth-free silicon-free brass alloy with
excellent cutting performance (hereinafter referred to as the
inventive product 8) comprises, by the total weight of the brass
alloy, 60-65 wt % copper, 0.1-0.25 wt % lead, and two or more
elements selected from the group consisting of, by the total weight
of the brass alloy, 0.1-0.7 wt % aluminum, 0.05-0.5 wt % tin,
0.05-0.3 wt % phosphorus, 0.05-0.5 wt % manganese and 0.001-0.01 wt
% boron, and a balance of zinc.
[0026] Whether aluminum, tin, phosphorus, manganese and/or boron
should be added depends on the requirement for cutting performance
of various products. The content to be added has the same interval
as that of the inventive product 3, and this is based on the same
reason as that of the inventive product 3.
[0027] A low-lead bismuth-free silicon-free brass alloy with
excellent cutting performance (hereinafter referred to as the
inventive product 9) comprises, by the total weight of the brass
alloy, 60-65 wt % copper, 0.1-0.25 wt % lead, and two or more
elements selected from the group consisting of, by the total weight
of the brass alloy, 0.1-0.7 wt % aluminum, 0.05-0.5 wt % tin,
0.05-0.3 wt % phosphorus, 0.05-0.5 wt % manganese and 0.001-0.01 wt
% boron, and a balance of zinc, and further comprises unavoidable
impurities which comprise, by the total weight of the brass alloy,
0.25 wt % or less nickel, 0.15 wt % or less chrome and/or 0.25 wt %
or less iron.
[0028] As compared with the inventive product 8, the inventive
product 9 further comprises some unavoidable impurities, i.e.,
mechanical impurities of nickel, chrome and/or iron.
[0029] A low-lead bismuth-free silicon-free brass alloy with
excellent cutting performance (hereinafter referred to as the
inventive product 10) comprises, by the total weight of the brass
alloy, 60-65 wt % copper, 0.1-0.25 wt % lead, 0.05-0.5 wt % tin and
0.05-0.3 wt % phosphorus, and a balance of zinc.
[0030] The content of phosphorus in the inventive product 10 has
the same interval and effect as that in the inventive product 2.
Although phosphorus can't form .gamma. phase, phosphorus has a
function of facilitating a good distribution of .gamma. phase.
Meanwhile, in case phosphorus is added, .gamma. phase will disperse
crystal grains of the primary .alpha. phase, thus increasing
casting performance and corrosion resistance of the alloy. Thus,
even if there is no aluminum, the needs for cutting performance can
still be met in the usual production situation.
[0031] A low-lead bismuth-free silicon-free brass alloy with
excellent cutting performance (hereinafter referred to as the
inventive product 11) comprises, by the total weight of the brass
alloy, 60-65 wt % copper, 0.1-0.25 wt % lead, 0.05-0.5 wt % tin and
0.05-0.3 wt % phosphorus, and further comprises two or more
elements selected from the group consisting of 0.1-0.7 wt %
aluminum, 0.05-0.5 wt % manganese and 0.001-0.01 wt % boron by the
total weight of the brass alloy, and a balance of zinc.
[0032] Whether aluminum, manganese and/or boron should be added
depends on the requirement for cutting performance of various
produc. The content to be added has the same interval as that of
the inventive product 3, and this is based on the same reason as
that of the inventive product 3.
[0033] A low-lead bismuth-free silicon-free brass alloy with
excellent cutting performance (hereinafter referred to as the
inventive product 12) comprises, by the total weight of the brass
alloy, 60-65 wt % copper, 0.1-0.25 wt % lead, 0.05-0.5 wt % tin and
0.05-0.3 wt % phosphorus, two or more elements selected from the
group consisting of 0.1-0.7 wt % aluminum, 0.05-0.5 wt % manganese
and 0.001-0.01 wt % boron by the total weight of the brass alloy,
and further comprises unavoidable impurities which comprise, by the
total weight of the brass alloy, 0.25 wt % or less nickel, 0.15 wt
% or less chrome and/or 0.25 wt % or less iron, and a balance of
zinc.
[0034] As compared with the inventive product 11, the inventive
product 12 further comprises some unavoidable impurities, i.e.,
mechanical impurities of nickel, chrome and/or iron.
[0035] The invention further provides a method for fabricating
brass alloy. By taking the inventive product 3 as an example, the
method comprises the steps of:
[0036] 1) providing copper and manganese and heating to
1000-1050.degree. C. to form a copper-manganese alloy melt;
[0037] 2) decreasing the temperature of the copper-manganese alloy
melt to 950-1000.degree. C.;
[0038] 3) covering the surface of copper-manganese alloy melt with
a glass slagging agent;
[0039] 4) adding zinc to the copper-manganese alloy melt to form a
copper-manganese-zinc melt;
[0040] 5) deslagging the copper-manganese-zinc melt, and adding
lead, aluminum, tin to the brass alloy melt to form a metal
melt;
[0041] 6) elevating the temperature of the metal melt to
1000-1050.degree. C., and adding boron copper alloy, phosphorus
copper alloy to form a low-lead bismuth-free silicon-free brass
alloy melt; and
[0042] 7) discharging the brass alloy melt for casting to form the
brass alloy.
[0043] Preferably, in the above fabricating method, a
copper-manganese alloy is provided as the precursor of copper and
manganese elements.
[0044] Preferably, in the above fabricating method, the melting
furnace is a high-frequency melting furnace, and the high-frequency
melting furnace is provided with a furnace lining of graphite
crucible.
[0045] The high-frequency melting furnace has the features of a
large melting rate, a large temperature elevating rate, cleanness
without pollution, and the ability of self-stirring (i.e., under
the action of magnetic field lines) during melting.
[0046] In the invention, the low-lead bismuth-free silicon-free
brass alloy is formed by adding various constituents in respective
ratio, and then subjecting them to a process in a high-frequency
melting furnace. The resulting brass alloy has a mechanical
processability which is comparable with that of the existing
lead-containing brass, has an excellent tensile strength,
elongation rate, and dezincification resistance, and has a low
content of lead. As a result, the brass alloy is suitable for
replacing the existing lead-containing brass alloy and for
producing parts like faucet and sanitary ware.
BRIEF DESCRIPTION OF THE DRAWINGS
[0047] FIG. 1 is a flow chart illustrating a method for fabricating
the inventive product 3.
DETAILED DESCRIPTION OF THE EMBODIMENTS
[0048] The technical solutions of the invention will be described
expressly by referring to embodiments thereof.
[0049] It is not intended to limit the scope of the invention to
the described exemplary embodiments. The modifications and
alterations to features of the invention as described herein, as
well as other applications of the concept of the invention (which
will occur to the skilled in the art, upon reading the present
disclosure) still fall within the scope of the invention.
[0050] In the invention, the wording "or more", "or less" in the
expression for describing values indicates that the expression
comprises the relevant values.
[0051] The dezincification corrosion resistant performance
measurement, as used herein, is performed according to AS-2345-2006
specification in the cast state, in which 12.8 g copper chloride is
added into 1000 C.C deionized water, and the object to be measured
is placed in the resulting solution for 24 hr to measure a
dezincification depth. .circleincircle. indicates a dezincification
depth of less than 100 .mu.m; .smallcircle. indicates a
dezincification depth between 100 .mu.m and 200 .mu.m; and
indicates a dezincification depth larger than 200 .mu.m.
[0052] The cutting performance measurement, as used herein, is
performed in the cast state, in which the same cutting tool is
adopted with the same cutting speed and feed amount. The cutting
speed is 25 m/min (meter per minute), the feed amount is 0.2 mm/r
(millimeter per number of cutting edge), the cutting depth is 0.5
mm, the measurement rod has a diameter of 20 mm, and C36000 alloy
is taken as a reference. The relative cutting rate is derived by
measuring the cutting resistance.
[0053] The relative cutting rate=cutting resistance of C36000
alloy/cutting resistance of the sample.
[0054] .circleincircle. indicates a relative cutting rate larger
than 85%; and .smallcircle. indicates a relative cutting rate
larger than 70%.
[0055] Both the tensile strength measurement and the elongation
rate measurement, as used herein, are performed in the cast state
at room temperature as an elongation measurement. The elongation
rate refers to a ratio between the total deformation of gauge
section after elongation .DELTA.L and the initial gauge length L of
the sample in percentage: .delta.=.DELTA.L/L.times.100%. The
reference sample is a lead-containing brass with the same state and
specification, i.e., C36000 alloy.
[0056] According to measurement, the proportions for constituents
of C36000 alloy are listed as follow, in the unit of weight
percentage (wt %):
TABLE-US-00001 copper zinc bismuth antimony manganese aluminum lead
iron Material No. (Cu) (Zn) (Bi) (Sb) (Mn) (Al) tin (Sn) (Pb) (Fe)
C36000 alloy 60.53 36.26 0 0 0 0 0.12 2.97 0.12
[0057] FIG. 1 is a flow chart illustrating a method for fabricating
the inventive product 3, which comprises the steps of:
[0058] Step S100: providing copper and manganese. In this step, a
copper-manganese alloy can be provided as the precursor of copper
and manganese elements.
[0059] Step S102: heating the copper-manganese precursor alloy to
1000-1050.degree. C. to form a copper-manganese alloy melt. In this
step, the copper-manganese alloy can be added into the
high-frequency melting furnace, and heated to melt in the melting
furnace. The temperature can be elevated to 1000-1050.degree. C.,
and even up to 1100.degree. C., for 5-10 minutes, so that the
copper-manganese alloy is melt into a copper-manganese alloy melt.
With these actions, it is possible to prevent the melt copper
manganese from absorbing a lot of external gases (due to a too high
temperature), which may otherwise result in cracking in the molded
alloy.
[0060] Step S104: decreasing the temperature of the
copper-manganese alloy melt to 950-1000.degree. C. In this step,
when the temperature in the melting furnace is elevated to
1000-1050.degree. C. for a durationi of 5-10 minutes, the power
supply of the high-frequency melting furnace is turned off, so that
the temperature in the melting furnace is reduced to
950-1000.degree. C., while the copper-manganese alloy melt is
maintained in the melt state.
[0061] Step S106: covering the surface of copper-manganese alloy
melt with a glass slagging agent. In this step, the surface of
copper-manganese alloy melt is covered with the glass slagging
agent at 950-1000.degree. C. This step can effectively prevent the
melt from contacting the air, and prevent zinc to be added in the
next step from boiling and evaporating due to melting at a high
temperature of 950-1000.degree. C.
[0062] Step S108: adding zinc to the copper-manganese alloy melt to
form a copper-manganese-zinc melt. In this step, zinc is added to
the melting furnace, and is immersed into the copper-manganese
alloy melt, so that zinc is sufficiently melt in the
copper-manganese alloy melt to form a copper-manganese-zinc
melt.
[0063] Step S110: deslagging the copper-manganese-zinc melt. In
this step, the copper-manganese-zinc melt can be stirred and mixed
under the action high-frequency induction, and then the slagging
agent can be removed. Then, the copper-manganese-zinc melt is
deslagged with a deslagging agent.
[0064] Step S112: adding lead, aluminum, and tin to the
copper-manganese-zinc melt to form a metal melt. In this step,
copper lead precursor alloy, copper aluminum precursor alloy, and
copper tin precursor alloy can be added to the
copper-manganese-zinc melt.
[0065] Step S114: elevating the temperature of the metal melt to
1000-1050.degree. C., and adding copper boron alloy and phosphorus
copper alloy to form a low-lead bismuth-free silicon-free brass
alloy melt.
[0066] Step S116: discharging the brass alloy melt for casting to
form the brass alloy. In this step, the brass alloy melt is stirred
evenly, the discharging temperature is controlled at
1000-1050.degree. C., and finally the brass alloy melt is
discharged to casting a low-lead bismuth-free silicon-free brass
alloy which exhibits good processability, dezincification
resistance, and mechanical performance.
Embodiment 1
[0067] Table 1-1 lists inventive products 1 with 5 different
constituents which are fabricated with the above process, which are
respectively numbered as 1001-1005, each constituent being in the
unit of weight percentage (wt %).
TABLE-US-00002 TABLE 1-1 No. copper (Cu) zinc (Zn) lead (Pb)
aluminum (Al) tin (Sn) 1001 63.633 35.559 0.235 0.231 0.340 1002
64.365 34.183 0.250 0.700 0.500 1003 62.345 36.943 0.110 0.300
0.300 1004 65.000 34.424 0.100 0.424 0.050 1005 60.000 39.445 0.108
0.100 0.345
[0068] Measurements about cutting performance, dezincification
corrosion resistant performance, tensile strength, and elongation
rate are performed on alloys with the above constituents in the
cast state at room temperature, and the reference sample is a
lead-containing brass with the same state and specification, i.e.,
C36000 alloy.
[0069] Results of the measurements about tensile strength,
elongation rate, cutting performance, and dezincification corrosion
resistant performance are listed as follow:
TABLE-US-00003 RELA- TENSILE ELONGA- TIVE STRENGTH TION
DEZINCIFICATION CUTTING No. (N/mm.sup.2) RATE (%) LAYER RATE 1001
366 23 .circleincircle. .circleincircle. 1002 387 21
.circleincircle. .circleincircle. 1003 325 27 .circleincircle.
.circleincircle. 1004 387 25 .circleincircle. .circleincircle. 1005
295 35 .largecircle. .circleincircle. C36000 394 9 X
.circleincircle. alloy
Embodiment 2
[0070] Table 2-1 lists inventive products 2 with 5 different
constituents which are fabricated with the above process, which are
respectively numbered as 2001-2005, each constituent being in the
unit of weight percentage (wt %).
TABLE-US-00004 TABLE 2-1 aluminum manganese phosphorus No. copper
(Cu) zinc (Zn) lead (Pb) (Al) tin (Sn) (Mn) (P) 2001 60.000 39.137
0.144 0.312 0.055 0.050 0.300 2002 64.307 34.305 0.214 0.700 0.320
-- 0.152 2003 62.221 37.467 0.250 0.521 0.089 0.500 0.050 2004
65.000 32.662 0.213 0.685 0.500 0.432 -- 2005 61.331 37.922 0.100
0.100 0.050 0.443 0.252
[0071] Measurements about cutting performance, dezincification
corrosion resistant performance, tensile strength, and elongation
rate are performed on alloys with the above constituents in the
cast state at room temperature, and the reference sample is a
lead-containing brass with the same state and specification, i.e.,
C36000 alloy.
[0072] Results of the measurements about tensile strength,
elongation rate, cutting performance, and dezincification corrosion
resistant performance are listed as follow:
TABLE-US-00005 RELA- TENSILE ELONGA- TIVE STRENGTH TION
DEZINCIFICATION CUTTING No. (N/mm.sup.2) RATE (%) LAYER RATE 2001
338 23 .circleincircle. .circleincircle. 2002 307 19
.circleincircle. .circleincircle. 2003 375 31 .largecircle.
.circleincircle. 2004 381 29 .circleincircle. .circleincircle. 2005
308 17 .largecircle. .circleincircle. C36000 394 9 X
.circleincircle. alloy
Embodiment 3
[0073] Table 3-1 lists inventive products 3 with 8 different
constituents which are fabricated with the above process, which are
respectively numbered as 3001-3008, each constituent being in the
unit of weight percentage (wt %).
TABLE-US-00006 TABLE 3-1 aluminum manganese phosphorus No. copper
(Cu) zinc (Zn) lead (Pb) (Al) tin (Sn) (Mn) (P) boron (B) 3001
62.400 36.395 0.220 0.542 0.152 -- 0.288 0.001 3002 60.000 39.245
0.100 0.163 0.406 0.075 -- 0.009 3003 64.221 34.422 0.122 0.344
0.500 0.332 0.050 0.007 3004 63.443 35.250 0.203 0.700 0.351 0.050
-- 0.001 3005 63.766 34.967 0.200 0.698 0.081 -- 0.286 -- 3006
64.250 35.061 0.152 0.100 0.130 -- 0.300 0.005 3007 60.355 38.534
0.250 0.311 0.050 0.488 -- 0.010 3008 65.000 34.110 0.100 0.211
0.077 0.500 -- --
[0074] Measurements about cutting performance, dezincification
corrosion resistant performance, tensile strength, and elongation
rate are performed on alloys with the above constituents in the
cast state at room temperature, and the reference sample is a
lead-containing brass with the same state and specification, i.e.,
C36000 alloy.
[0075] Results of the measurements about tensile strength,
elongation rate, cutting performance, and dezincification corrosion
resistant performance are listed as follow:
TABLE-US-00007 RELA- TENSILE ELONGA- TIVE STRENGTH TION
DEZINCIFICATION CUTTING No. (N/mm.sup.2) RATE (%) LAYER RATE 3001
348 19 .circleincircle. .circleincircle. 3002 359 17
.circleincircle. .circleincircle. 3003 385 15 .circleincircle.
.circleincircle. 3004 379 26 .circleincircle. .circleincircle. 3005
389 18 .circleincircle. .circleincircle. 3006 392 27
.circleincircle. .circleincircle. 3007 311 39 .circleincircle.
.circleincircle. 3008 303 30 .circleincircle. .circleincircle.
C36000 394 9 X .circleincircle. alloy
Embodiment 4
[0076] Table 4-1 lists inventive products 4 with 8 different
constituents which are fabricated with the above process, which are
respectively numbered as 4001-4008, each constituent being in the
unit of weight percentage (wt %).
TABLE-US-00008 TABLE 4-1 aluminum manganese phosphorus No. copper
(Cu) zinc (Zn) lead (Pb) (Al) tin (Sn) (Mn) (P) boron (B) 4001
61.306 37.387 0.205 0.650 0.050 0.093 0.300 0.007 4002 61.560
37.539 0.100 0.165 0.413 0.170 0.050 0.001 4003 63.750 35.015 0.193
0.371 0.500 0.057 0.107 0.005 4004 62.105 36.704 0.211 0.502 0.333
0.050 0.083 0.010 4005 65.000 33.232 0.202 0.700 0.085 0.487 0.286
0.006 4006 62.950 35.663 0.188 0.304 0.132 0.498 0.260 0.003 4007
60.000 38.802 0.250 0.387 0.111 0.138 0.300 0.010 4008 61.432
37.539 0.135 0.100 0.050 0.500 0.234 0.008
[0077] Measurements about cutting performance, dezincification
corrosion resistant performance, tensile strength, and elongation
rate are performed on alloys with the above constituents in the
cast state at room temperature, and the reference sample is a
lead-containing brass with the same state and specification, i.e.,
C36000 alloy.
[0078] Results of the measurements about tensile strength,
elongation rate, cutting performance, and dezincification corrosion
resistant performance are listed as follow:
TABLE-US-00009 RELA- TENSILE ELONGA- TIVE STRENGTH TION
DEZINCIFICATION CUTTING No. (N/mm.sup.2) RATE (%) LAYER RATE 4001
302 29 .circleincircle. .circleincircle. 4002 319 19
.circleincircle. .circleincircle. 4003 383 23 .circleincircle.
.circleincircle. 4004 344 26 .circleincircle. .circleincircle. 4005
389 27 .circleincircle. .circleincircle. 4006 332 37
.circleincircle. .circleincircle. 4007 311 39 .circleincircle.
.circleincircle. 4008 303 20 .circleincircle. .circleincircle.
C36000 394 9 X .circleincircle. alloy
Embodiment 5
[0079] Table 5-1 lists inventive products 5 with 8 different
constituents which are fabricated with the above process, which are
respectively numbered as 5001-5008, each constituent being in the
unit of weight percentage (wt %).
TABLE-US-00010 TABLE 5-1 copper lead manganese aluminum phosphorus
boron nickel chrome iron No. (Cu) zinc (Zn) (Pb) (Mn) (Al) tin (Sn)
(P) (B) (Ni) (Cr) (Fe) 5001 61.783 37.673 0.100 0.067 0.155 0.050
0.105 0.002 -- 0.065 -- 5002 62.344 36.864 0.187 0.056 0.267 0.063
0.050 0.001 0.010 0.150 0.008 5003 65.000 33.638 0.250 0.500 0.100
0.172 0.211 0.010 0.007 0.097 0.015 5004 62.271 36.191 0.147 0.324
0.156 0.500 0.300 0.007 0.104 -- -- 5005 64.033 34.003 0.195 0.211
0.545 0.433 0.240 0.005 -- 0.085 0.250 5006 63.078 34.939 0.179
0.085 0.700 0.408 0.177 0.001 0.250 0.073 0.110 5007 63.730 34.926
0.188 0.050 0.398 0.383 0.285 0.006 -- 0.034 -- 5008 60.000 38.865
0.158 0.075 0.400 0.217 0.102 0.008 0.062 0.008 0.105
[0080] Measurements about cutting performance, dezincification
corrosion resistant performance, tensile strength, and elongation
rate are performed on alloys with the above constituents in the
cast state at room temperature, and the reference sample is a
lead-containing brass with the same state and specification, i.e.,
C36000 alloy.
[0081] Results of the measurements about tensile strength,
elongation rate, cutting performance, and dezincification corrosion
resistant performance are listed as follow:
TABLE-US-00011 RELA- TENSILE ELONGA- TIVE STRENGTH TION
DEZINCIFICATION CUTTING No. (N/mm.sup.2) RATE (%) LAYER RATE 5001
312 19 .circleincircle. .circleincircle. 5002 319 21
.circleincircle. .circleincircle. 5003 390 30 .circleincircle.
.circleincircle. 5004 334 17 .circleincircle. .circleincircle. 5005
389 18 .circleincircle. .circleincircle. 5006 337 25
.circleincircle. .circleincircle. 5007 321 19 .circleincircle.
.circleincircle. 5008 301 21 .circleincircle. .circleincircle.
C36000 394 9 X .circleincircle. alloy
Embodiment 6
[0082] Table 6-1 lists inventive products 6 with 8 different
constituents which are fabricated with the above process, which are
respectively numbered as 6001-6008, each constituent being in the
unit of weight percentage (wt %).
TABLE-US-00012 TABLE 6-1 copper manganese aluminum phosphorus No.
(Cu) zinc (Zn) lead (Pb) (Mn) (Al) tin (Sn) (P) boron (B) 6001
62.311 37.687 0.103 0.105 0.100 0.050 0.211 0.009 6002 60.000
39.824 0.117 0.057 0.322 0.121 0.300 0.010 6003 62.052 37.195 0.201
0.050 0.203 0.234 0.055 0.008 6004 62.261 36.613 0.250 0.213 0.104
0.500 0.050 0.007 6005 64.075 34.316 0.207 0.304 0.556 0.432 0.103
0.005 6006 63.011 35.151 0.184 0.500 0.607 0.331 0.213 0.001 6007
65.000 33.371 0.197 0.443 0.700 0.087 0.198 0.002 6008 60.079
39.028 0.100 0.116 0.433 0.102 0.137 0.003
[0083] Measurements about cutting performance, dezincification
corrosion resistant performance, tensile strength, and elongation
rate are performed on alloys with the above constituents in the
cast state at room temperature, and the reference sample is a
lead-containing brass with the same state and specification, i.e.,
C36000 alloy.
[0084] Results of the measurements about tensile strength,
elongation rate, cutting performance, and dezincification corrosion
resistant performance are listed as follow:
TABLE-US-00013 RELA- TENSILE ELONGA- TIVE STRENGTH TION
DEZINCIFICATION CUTTING No. (N/mm.sup.2) RATE (%) LAYER RATE 6001
344 30 .circleincircle. .circleincircle. 6002 313 31
.circleincircle. .circleincircle. 6003 340 27 .circleincircle.
.circleincircle. 6004 399 17 .circleincircle. .circleincircle. 6005
351 21 .circleincircle. .circleincircle. 6006 339 23
.circleincircle. .circleincircle. 6007 355 19 .circleincircle.
.circleincircle. 6008 307 21 .circleincircle. .circleincircle.
C36000 394 9 X .circleincircle. alloy
Embodiment 7
[0085] Table 7-1 lists inventive products 7 with 8 different
constituents which are fabricated with the above process, which are
respectively numbered as 7001-7008, each constituent being in the
unit of weight percentage (wt %).
TABLE-US-00014 TABLE 7-1 copper manganese aluminum phosphorus No.
(Cu) zinc (Zn) lead (Pb) (Mn) (Al) tin (Sn) (P) boron (B) 7001
60.231 38.981 0.100 0.341 0.112 0.103 0.122 0.008 7002 61.054
38.264 0.196 0.117 0.231 0.076 0.050 0.010 7003 62.013 36.904 0.133
0.500 0.100 0.050 0.292 0.006 7004 62.613 35.805 0.100 0.493 0.540
0.143 0.300 0.004 7005 65.000 33.525 0.211 0.050 0.631 0.500 0.076
0.005 7006 63.011 35.287 0.250 0.210 0.700 0.410 0.123 0.007 7007
60.000 38.747 0.201 0.077 0.487 0.377 0.100 0.009 7008 61.123
37.779 0.197 0.192 0.391 0.218 0.097 0.001
[0086] Measurements about cutting performance, dezincification
corrosion resistant performance, tensile strength, and elongation
rate are performed on alloys with the above constituents in the
cast state at room temperature, and the reference sample is a
lead-containing brass with the same state and specification, i.e.,
C36000 alloy.
[0087] Results of the measurements about tensile strength,
elongation rate, cutting performance, and dezincification corrosion
resistant performance are listed as follow:
TABLE-US-00015 RELA- TENSILE ELONGA- TIVE STRENGTH TION
DEZINCIFICATION CUTTING No. (N/mm.sup.2) RATE (%) LAYER RATE 7001
327 23 .circleincircle. .circleincircle. 7002 332 17
.circleincircle. .circleincircle. 7003 341 18 .circleincircle.
.circleincircle. 7004 354 31 .circleincircle. .circleincircle. 7005
397 37 .circleincircle. .circleincircle. 7006 393 39
.circleincircle. .circleincircle. 7007 300 28 .circleincircle.
.circleincircle. 7008 301 27 .circleincircle. .circleincircle.
C36000 394 9 X .circleincircle. alloy
Embodiment 8
[0088] Table 8-1 lists inventive products 8 with 8 different
constituents which are fabricated with the above process, which are
respectively numbered as 8001-8008, each constituent being in the
unit of weight percentage (wt %).
TABLE-US-00016 TABLE 8-1 copper manganese aluminum phosphorus No.
(Cu) zinc (Zn) lead (Pb) (Mn) (Al) tin (Sn) (P) boron (B) 8001
60.000 39.615 0.105 0.052 0.123 -- 0.102 0.001 8002 62.031 37.395
0.197 0.121 0.100 0.102 0.050 -- 8003 62.178 36.995 0.250 0.455 --
0.112 -- 0.008 8004 65.000 33.839 0.100 0.500 0.341 0.050 0.158
0.010 8005 64.175 35.328 0.211 -- -- -- 0.277 0.007 8006 64.097
34.142 0.233 0.314 0.407 0.500 0.300 0.005 8007 63.050 35.487 0.102
0.218 0.518 0.411 0.212 -- 8008 61.071 38.101 0.112 0050 0.700 --
-- 0.009
[0089] Measurements about cutting performance, dezincification
corrosion resistant performance, tensile strength, and elongation
rate are performed on alloys with the above constituents in the
cast state at room temperature, and the reference sample is a
lead-containing brass with the same state and specification, i.e.,
C36000 alloy.
[0090] Results of the measurements about tensile strength,
elongation rate, cutting performance, and dezincification corrosion
resistant performance are listed as follow:
TABLE-US-00017 RELA- TENSILE ELONGA- TIVE STRENGTH TION
DEZINCIFICATION CUTTING No. (N/mm.sup.2) RATE (%) LAYER RATE 8001
302 23 .circleincircle. .circleincircle. 8002 311 27
.circleincircle. .circleincircle. 8003 345 32 .circleincircle.
.circleincircle. 8004 342 24 .circleincircle. .circleincircle. 8005
367 37 .circleincircle. .circleincircle. 8006 366 29
.circleincircle. .circleincircle. 8007 339 31 .circleincircle.
.circleincircle. 8008 307 27 .circleincircle. .circleincircle.
C36000 394 9 X .circleincircle. alloy
Embodiment 9
[0091] Table 9-1 lists inventive products 9 with 8 different
constituents which are fabricated with the above process, which are
respectively numbered as 9001-9008, each constituent being in the
unit of weight percentage (wt %).
TABLE-US-00018 TABLE 9-1 copper lead manganese aluminum phosphorus
boron nickel chrome iron No. (Cu) zinc (Zn) (Pb) (Mn) (Al) tin (Sn)
(P) (B) (Ni) (Cr) (Fe) 9001 61.058 38.409 0.112 -- -- 0.098 0.073
-- -- -- 0.250 9002 62.025 36.933 0.109 0.102 0.500 0.050 0.050
0.010 0.009 0.113 0.099 9003 60.000 39.554 0.100 0.050 -- -- --
0.007 0.215 -- 0.074 9004 61.256 36.743 0.207 0.321 0.700 0.134
0.231 0.008 0.250 0.150 -- 9005 65.000 34.019 0.198 0.076 0.100 --
0.300 -- 0.125 0.078 0.104 9006 63.056 34.935 0.222 0.500 0.214
0.500 0.289 0.001 0.123 0.043 0.117 9007 63.340 35.447 0.250 --
0.566 -- 0.250 0.004 0.143 -- -- 9008 60.870 37.906 0.234 -- 0.452
0.430 -- -- -- 0.108 --
[0092] Measurements about cutting performance, dezincification
corrosion resistant performance, tensile strength, and elongation
rate are performed on alloys with the above constituents in the
cast state at room temperature, and the reference sample is a
lead-containing brass with the same state and specification, i.e.,
C36000 alloy.
[0093] Results of the measurements about tensile strength,
elongation rate, cutting performance, and dezincification corrosion
resistant performance are listed as follow:
TABLE-US-00019 RELA- TENSILE ELONGA- TIVE STRENGTH TION
DEZINCIFICATION CUTTING No. (N/mm.sup.2) RATE (%) LAYER RATE 9001
317 27 .circleincircle. .circleincircle. 9002 324 19
.circleincircle. .circleincircle. 9003 303 17 .circleincircle.
.circleincircle. 9004 378 36 .circleincircle. .circleincircle. 9005
389 17 .circleincircle. .circleincircle. 9006 332 37
.circleincircle. .circleincircle. 9007 391 39 .circleincircle.
.circleincircle. 9008 303 21 .circleincircle. .circleincircle.
C36000 394 9 X .circleincircle. alloy
Embodiment 10
[0094] Table 10-1 lists inventive products 1 with 5 different
constituents which are fabricated with the above process0, which
are respectively numbered as 10001-10005, each constituent being in
the unit of weight percentage (wt %).
TABLE-US-00020 TABLE 10-1 phosphorus No. copper (Cu) zinc (Zn) lead
(Pb) tin (Sn) (P) 10001 60.000 39.740 0.113 0.089 0.056 10002
62.345 37.272 0.100 0.050 0.231 10003 65.000 33.964 0.234 0.500
0.300 10004 61.983 37.366 0.247 0.324 0.078 10005 64.037 35.552
0.250 0.109 0.050
[0095] Measurements about cutting performance, dezincification
corrosion resistant performance, tensile strength, and elongation
rate are performed on alloys with the above constituents in the
cast state at room temperature, and the reference sample is a
lead-containing brass with the same state and specification, i.e.,
C36000 alloy.
[0096] Results of the measurements about tensile strength,
elongation rate, cutting performance, and dezincification corrosion
resistant performance are listed as follow:
TABLE-US-00021 RELA- TENSILE ELONGA- TIVE STRENGTH TION
DEZINCIFICATION CUTTING No. (N/mm.sup.2) RATE (%) LAYER RATE 10001
300 29 .circleincircle. .circleincircle. 10002 337 19
.circleincircle. .circleincircle. 10003 389 33 .circleincircle.
.circleincircle. 10004 364 26 .circleincircle. .circleincircle.
10005 379 27 .circleincircle. .circleincircle. C36000 394 9 X
.circleincircle. alloy
Embodiment 11
[0097] Table 11-1 lists inventive products 11 with 8 different
constituents which are fabricated with the above process, which are
respectively numbered as 11001-11008, each constituent being in the
unit of weight percentage (wt %).
TABLE-US-00022 TABLE 11-1 copper manganese aluminum phosphorus No.
(Cu) zinc (Zn) lead (Pb) (Mn) (Al) tin (Sn) (P) boron (B) 11001
63.521 36.133 0.119 0.098 -- 0.067 0.050 0.010 11002 62.143 37.196
0.234 0.050 0.198 0.054 0.123 -- 11003 60.000 39.228 0.235 0.178
0.100 0.103 0.150 0.006 11004 63.015 35.844 0.200 -- 0.655 0.050
0.231 0.003 11005 65.000 33.061 0.250 0.500 0.543 0.343 0.300 0.001
11006 61.197 37.214 0.179 0.377 0.433 0.500 0.098 -- 11007 61.132
37.588 0.150 0.236 0.231 0.476 0.178 0.007 11008 62.273 36.599
0.100 -- 0.700 0.214 0.104 0.008
[0098] Measurements about cutting performance, dezincification
corrosion resistant performance, tensile strength, and elongation
rate are performed on alloys with the above constituents in the
cast state at room temperature, and the reference sample is a
lead-containing brass with the same state and specification, i.e.,
C36000 alloy.
[0099] Results of the measurements about tensile strength,
elongation rate, cutting performance, and dezincification corrosion
resistant performance are listed as follow:
TABLE-US-00023 RELA- TENSILE ELONGA- TIVE STRENGTH TION
DEZINCIFICATION CUTTING No. (N/mm.sup.2) RATE (%) LAYER RATE 11001
361 23 .circleincircle. .circleincircle. 11002 354 33
.circleincircle. .circleincircle. 11003 317 39 .circleincircle.
.circleincircle. 11004 336 36 .circleincircle. .circleincircle.
11005 401 41 .circleincircle. .circleincircle. 11006 321 26
.circleincircle. .circleincircle. 11007 300 23 .circleincircle.
.circleincircle. 11008 341 21 .circleincircle. .circleincircle.
C36000 394 9 X .circleincircle. alloy
Embodiment 12
[0100] Table 12-1 lists inventive products 12 with 8 different
constituents which are fabricated with the above process, which are
respectively numbered as 12001-12008, each constituent being in the
unit of weight percentage (wt %).
TABLE-US-00024 TABLE 2-1 copper lead manganese aluminum phosphorus
boron nickel chrome iron No. (Cu) zinc (Zn) (Pb) (Mn) (Al) tin (Sn)
(P) (B) (Ni) (Cr) (Fe) 12001 61.148 38.358 0.250 0.098 -- 0.088
0.050 0.005 -- -- 0.003 12002 62.434 36.989 0.123 0.050 0.102 0.103
0.076 0.001 0.122 -- -- 12003 60.000 39.131 0.108 -- 0.234 0.231
0.136 0.010 -- 0.150 -- 12004 60.166 38.272 0.197 0.232 -- 0.455
0.220 0.007 0.250 0.098 0.103 12005 60.000 37.850 0.100 0.341 0.452
0.500 0.300 -- 0.207 -- 0.250 12006 62.126 36.129 0.102 0.500 0.100
0.341 0.276 0.006 0.198 0.109 0.113 12007 65.000 33.876 0.113 --
0.673 0.122 0.087 0.009 0.113 0.007 -- 12008 61.430 37.130 0.150
0.476 0.700 0.050 0.059 -- -- 0.004 0.001
[0101] Measurements about cutting performance, dezincification
corrosion resistant performance, tensile strength, and elongation
rate are performed on alloys with the above constituents in the
cast state at room temperature, and the reference sample is a
lead-containing brass with the same state and specification, i.e.,
C36000 alloy.
[0102] Results of the measurements about tensile strength,
elongation rate, cutting performance, and dezincification corrosion
resistant performance are listed as follow:
TABLE-US-00025 RELA- TENSILE ELONGA- TIVE STRENGTH TION
DEZINCIFICATION CUTTING No. (N/mm.sup.2) RATE (%) LAYER RATE 12001
312 29 .circleincircle. .circleincircle. 12002 317 19
.circleincircle. .circleincircle. 12003 303 13 .circleincircle.
.circleincircle. 12004 314 16 .circleincircle. .circleincircle.
12005 309 17 .circleincircle. .circleincircle. 12006 332 28
.circleincircle. .circleincircle. 12007 391 29 .circleincircle.
.circleincircle. 12008 311 21 .circleincircle. .circleincircle.
C36000 394 9 X .circleincircle. alloy
[0103] As can be seen, the lead-free bismuth-free silicon-free
brass alloy of the invention can be formed by adding various
constituents in respective ratio, and then subjecting them to a
process in a high-frequency melting furnace. The resulting brass
alloy has a mechanical processability which is comparable with that
of the existing lead-containing brass, has an excellent tensile
strength, elongation rate, and dezincification resistance, and has
a low content of lead. As a result, the brass alloy is suitable for
replacing the existing lead-containing brass alloy and for
producing parts like faucet and sanitary ware.
[0104] Although the invention has been described with respect to
embodiments thereof, these embodiments do not intend to limit the
invention. The ordinary skilled in the art can made modifications
and changes to the invention without departing from the spirit and
scope of the invention. Thus, the protection of the invention is
defined by the appended claims.
* * * * *