US20090311130A1 - Tin-free, lead-free free-cutting magnesium brass alloy and its manufacturing method - Google Patents
Tin-free, lead-free free-cutting magnesium brass alloy and its manufacturing method Download PDFInfo
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- US20090311130A1 US20090311130A1 US12/354,510 US35451009A US2009311130A1 US 20090311130 A1 US20090311130 A1 US 20090311130A1 US 35451009 A US35451009 A US 35451009A US 2009311130 A1 US2009311130 A1 US 2009311130A1
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- free
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- brass alloy
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- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 122
- 239000000956 alloy Substances 0.000 title claims abstract description 122
- 229910001369 Brass Inorganic materials 0.000 title claims abstract description 57
- 239000010951 brass Substances 0.000 title claims abstract description 57
- 239000011777 magnesium Substances 0.000 title claims abstract description 53
- 238000005520 cutting process Methods 0.000 title claims abstract description 49
- 229910052749 magnesium Inorganic materials 0.000 title claims abstract description 33
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 title description 9
- 229910052802 copper Inorganic materials 0.000 claims abstract description 10
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 8
- 229910052787 antimony Inorganic materials 0.000 claims abstract description 8
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 8
- 229910052702 rhenium Inorganic materials 0.000 claims abstract description 6
- 229910052796 boron Inorganic materials 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 5
- 238000005260 corrosion Methods 0.000 abstract description 14
- 230000007797 corrosion Effects 0.000 abstract description 14
- 229910052797 bismuth Inorganic materials 0.000 abstract description 10
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 6
- 238000005266 casting Methods 0.000 abstract description 5
- 238000005242 forging Methods 0.000 abstract description 4
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 abstract description 3
- 239000007769 metal material Substances 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 23
- 239000010949 copper Substances 0.000 description 18
- 239000000155 melt Substances 0.000 description 7
- 230000007423 decrease Effects 0.000 description 6
- 229910000765 intermetallic Inorganic materials 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000011701 zinc Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000007670 refining Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000011135 tin Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 229910017758 Cu-Si Inorganic materials 0.000 description 2
- 229910017888 Cu—P Inorganic materials 0.000 description 2
- 229910017931 Cu—Si Inorganic materials 0.000 description 2
- 229910017945 Cu—Ti Inorganic materials 0.000 description 2
- 229910000861 Mg alloy Inorganic materials 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 239000003651 drinking water Substances 0.000 description 2
- 235000020188 drinking water Nutrition 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 229910001110 Alpha-beta brass Inorganic materials 0.000 description 1
- 241000282412 Homo Species 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000037406 food intake Effects 0.000 description 1
- 238000003958 fumigation Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 239000011669 selenium Substances 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
- C22C9/04—Alloys based on copper with zinc as the next major constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon
Definitions
- the present invention generally relates to a magnesium brass alloy, especially a lead-free free-cutting magnesium brass alloy which is applicable in spare parts for a water supply system.
- lead-containing brass alloys such as CuZn40Pb1, C36000, C3604 and C3771 usually contain 1.0-3.7 wt % Pb for ensuring excellent free-cuttability.
- Lead-containing brass alloys are still widely used in the manufacture of many products due to their excellent cuttability and low cost.
- Pb-contaminated steam produced by the process of smelting and casting lead-contained brass alloy and Pb-contaminated dust produced in the process of cutting and grinding the lead-contained brass alloy are harmful to the human body and the environment. If the lead-containing brass alloys are used in drinking-water installations such as faucets, valves and bushings, contamination of the drinking water by Pb is unavoidable.
- toys which are produced by Pb-containing brass alloys are more harmful, as they are touched frequently, thus increasing potential exposure to Pb.
- One object of the present invention is to provide a magnesium brass alloy which will solve the limitations of conventional brass alloy discussed above especially the problem of lead contamination.
- One object of the present invention is to provide a lead-free magnesium brass alloy which is excellent in cuttability, castability, hot and cold workability and corrosion resistance and not harmful for the environment and the human body.
- One object of the present invention is to provide a lead-free free-cutting magnesium brass alloy which is particularly applicable in spare parts for water supply systems.
- One object of the present invention is to provide a manufacturing method for a magnesium brass alloy.
- the present invention is intended to provide a lead-free free-cutting magnesium brass alloy which comprises: 56.0 to 64.0 wt % Cu, 0.6 to 2.5 wt % Mg, 0.15 to 0.4 wt % P, other elements 0.002 to 0.9 wt %, (the said other elements comprise at least two elements selected from Al, Si, Sb, Re, Ti and B) and the balance being Zn with unavoidable impurities.
- the invented alloy is in the base of alpha-beta brass and realizes excellent cuttability by the fracture of intermetallic compounds Cu 2 Mg which is formed from element Mg and Cu.
- P is an important element. It improves castability, weldability, dezincification, and corrosion resistance of the invented alloy.
- the intermetallic compounds Cu 3 P which is formed from element P and Cu is complementary for the cuttability of the invented alloy. If the content of P is lower than 0.1 wt %, its benefit for cuttability of the magnesium brass alloy is not apparent. Therefore, the addition of P is preferably set in the range of 0.15 to 0.3 wt %, more preferably in the range of 0.2 to 0.29 wt % and most preferably in the range of 0.26 to 0.28 wt %.
- the invented alloy presents multi-component alloying and grain refining which favors the intermetallic compounds Cu 2 Mg and Cu 3 P in granular form to uniformly disperse in the interior and boundary of the crystal grain and improves plasticity of the alloy.
- the conventional brass alloy in the prior art usually contains a small amount of Mg (less than 0.01 wt %) for deoxidization and grain refining, contains a small amount of P (among 0.003 to 0.006 wt %) for deoxidization and for improving weldability of the brass alloy.
- Mg less than 0.01 wt %
- P among 0.003 to 0.006 wt %
- the content of Mg and P is much higher than the prior art discussed above.
- the invented alloy has excellent integrated performance.
- the invented alloy actually is a kind of new lead-free magnesium brass alloy with a high level of P.
- Mg is one of the main elements of the invented alloy except for Zn.
- the solid solubility of Mg in the matrix of copper is 3.3 wt %.
- the solid solubility of Mg in the matrix of copper will be decreased rapidly with the temperature decrease.
- the solid solubility will be equivalent to zero when the temperature is equivalent to the room temperature, precipitated Mg with Cu will form brittle but not hard intermetallic compounds Cu 2 Mg.
- Mg is selected as one of the main elements of the invented alloy for ensuring the cuttability of the invented alloy.
- Mg also has the effect of deoxidization, grain refining and dezincification corrosion resistance.
- Mg is preferably set in the range of 0.5 to 2.0 wt % and more preferably in the range of 0.7 to 1.6 wt %.
- Sb is a beneficial element for improving dezincification corrosion resistance.
- the content of Sb is preferably set in the range of 0 to 0.25 wt %.
- Al and Si have the effects of deoxidization, solid solution strengthening and corrosion resistance. If the content of Al and Si is higher, the flowability of the alloy melt will decrease. If the content of Si is higher, hard and brittle ⁇ -phase will form from Si and Cu so that the plasticity of the alloy melt will decrease.
- the addition of Al and Si is separately set in the range of 0.1 to 0.4 wt %.
- Re, Ti and B are very effective in grain refinement. Most kinds of lead-free free-cutting brass alloy more or less comprise these elements.
- the invented alloy also contains one or two such elements for grain refinement. Re also could ease the intermetallic compounds to disperse in the boundary of crystal grain and partially transfer to the interior of crystal grain.
- Prior art alloys included the element Sn to improve corrosion resistance, amongst other reasons.
- the alloy of the present invention need not include Sn. This is an improvement over the prior art because it further reduces the cost of the alloy.
- Fe also could refine the crystal grains for brass alloy, but Fe without solution or precipitated Fe as temperature decreases will influence the corrosion resistance of the alloy and consume P which is an important element for the invented alloy.
- the amount of Fe as an unavoidable impurity in the invented alloy is less than 0.05 wt %.
- the amount of Pb as an unavoidable impurity in the invented alloy is less than 0.02 wt %.
- the cost of necessary metal materials of the invented alloy is lower than lead-free free-cutting bismuth brass alloy and antimony brass alloy and is equal to lead-contained brass alloy by election of alloy elements and design of element content.
- the manufacturing processing of the invented alloy is as follows:
- the raw materials used in the alloy in accordance with the invention include: electrolytic Cu, electrolytic Zn, brass scrap, magnesium alloy, Cu—P master alloy, Cu—Si master alloy, Cu—Ti master alloy, Cu—B master alloy, and optionally industrially pure Sb, Al, and Re.
- the raw materials are added in a non-vacuum intermediate frequency induction electric furnace with a quartz sand furnace lining, in the following order:
- electrolytic Cu, brass scraps, and covering agent that enhances slag removal efficiency are added to the furnace. These materials are heated until they have melted. Then the Cu—Si master alloy, Cu—Ti master alloy, and Cu—B master alloy are added to the melt. Thereafter, pure Sb, Al and Re may optionally be added. These materials are again heated until melted, and are thereafter stirred. Then electrolytic Zn is added to the melt. The melt is stirred, and slag is skimmed from the melt. The Cu—P master alloy is then added, and the melt is stirred further. At last the magnesium alloy is added, and the melt is stirred further. When the melt reaches a temperature of 995 to 1030 degrees Celsius, it is poured into ingot molds.
- the alloy ingots may be processed in different ways according to the method of the invention.
- the ingot may be extruded at a temperature between 550 to 720 degrees Celsius for about 1 hour with an elongation coefficient of greater than 30 to be formed, for example, into bar materials.
- the ingot may be forged at a temperature between 580 and 680 degrees Celsius to be formed, for example, into a valve body for manufacturing water supply system components.
- the ingot may be remelted and cast at a temperature between 995 to 1015 degrees Celsius at a pressure of 0.3 to 0.5 Mpa for manufacturing faucets.
- the advantages of the invented alloy are as follows. Smelting is processing in the atmosphere when the metals are protected with the covering agent.
- the addition of easily oxidized and volatile Mg is not effected by the addition of a conventional Cu'Mg master alloy or pure magnesium, but rather by Mg-based alloy whose melting point is lower than pure magnesium and boiling point is higher than pure magnesium. This reduces the consumption of Mg and is better to control the addition of Mg.
- Casting ingots rather than extruding bars are used to disposably form spare parts with complex structures for water supply systems by precision die forging. It could take out extruding process and save manufacturing cost.
- the intermetallic compounds Cu 2 Mg and grain are further refined and dispersed uniformly thereby improving the mechanical properties of the invented alloy.
- the manufacturing method of the invented alloy is easy to carry out. And the equipments for production are the same as Pb-contained brass alloy.
- FIG. 1 shows the shapes of the cutting chips formed in Examples 1, 2 and 3.
- FIG. 2 shows the shapes of the cutting chips formed in Examples 4, 5 and 6.
- FIG. 3 shows the shapes of the cutting chips formed in Examples 7, 8 and 9.
- FIG. 4 shows the shapes of the cutting chips formed in cutting lead-contained brass alloy C36000 for comparison.
- the alloy composition in examples is shown in Table 1.
- the alloy ingot is extruded at the temperature ranging from 580° C. to 700° C. with an elongation coefficient of greater than 30 into bar materials.
- Some alloy ingot is forged at the temperature ranging from 590° C. to 710° C. to be spare parts with a complex structure for a water supply system.
- Some alloy ingot is remelted at the temperature between 990 to 1015° C. to make faucets by low pressure die casting.
- the lead-free brass alloy of present invention has been tested with results as follows:
- the samples for testing are in the half-hard state.
- the same cutting tool, cutting speed and feeding quantity (0.6 mm) is approached.
- the relative cutting ratio is calculated by testing cutting resistance of alloy C36000 and the invented alloy:
- FIG. 4 shows the shapes of the cutting chips formed in cutting lead-containing brass C36000. Then the cutting ratio of examples 1, 2 and 3 is ⁇ 80% by testing the cutting resistance of alloy C36000 and examples 1, 2 and 3 of the invented alloy.
- FIG. 1 shows the shapes of the cutting chips formed in Examples 1, 2 and 3.
- the cutting ratio of examples 4, 5 and 6 is ⁇ 85% by testing the cutting resistance of alloy C36000 and examples 4, 5 and 6 of the invented alloy.
- FIG. 2 shows the shapes of the cutting chips formed in Examples 4, 5 and 6.
- the cutting ratio of examples 7, 8 and 9 is ⁇ 90% by testing the cutting resistance of alloy C36000 and examples 7, 8 and 9 of the invented alloy.
- FIG. 3 shows the shapes of the cutting chips formed in Examples 7, 8 and 9.
- the test for dezincification corrosion resistance is conducted according to the PRC national standard GB10119-88.
- the samples for testing are in the stress relief annealing state.
- the test result is shown in Table 2.
- the sample for test is from extruded bar materials, casting and forging.
- the test for stress corrosion is conducted according to PRC national standard GB/T 10567.2-1997, Ammonia fumigation test. The test result is satisfactory when no crack appears in the face of the samples.
- the sample for testing are in half-hard state.
- the specification is ⁇ 6 mm bar.
- the test results are shown in table 2.
- the test for conventional volume shrinkage and spiral simples is for measuring the flowability of the alloy.
- the test for cylindrical samples is for measuing shrinkage crack resistance of the alloy.
- the test for strip samples is for measuring linear shrinkage rate of the alloy.
- volume shrinkage samples as may be seen in Table 2, if the face of the concentrating shrinkage cavity is smooth, and no visible shrinkage porosity in the bottom of the concentrating shrinkage cavity, it indicates castability is excellent and will be shown as “ ⁇ ” in Table 2. If the face of the concentrating shrinkage cavity is smooth but the height of visible shrinkage porosity in the bottom of the concentrating shrinkage cavity is less than 5 mm, it indicates castability is good, and will be shown as “ ⁇ ” in Table 2.
- the face of the concentrating shrinkage cavity is not smooth and the height of visible shrinkage porosity in the bottom of the concentrating shrinkage cavity is more than 5 mm, it indicates castability is poor, and will be shown as “ ⁇ ” in Table 2.
- the linear shrinkage rate is not more than 1.5%.
- For cylindrical samples as may be seen in Table 2, if no visible shrinkage crack is shown, it indicates castability is excellent and will be shown as “ ⁇ ” in Table 2. If the visible shrinkage crack is shown, it indicates the castability is poor, and will be shown as “ ⁇ ” in Table 2.
- Spiral samples are for measuring the flowability of the invented alloy. The test results of castability are shown in Table 2. The above results indicate the castability of the alloy is fine.
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Abstract
A tin-free lead-free free-cutting magnesium brass alloy comprises 56.0 to 64.0 wt % Cu, 0.6 to 2.5 wt % Mg, 0.15 to 0.4 wt % P and other elements 0.002 to 0.9 wt % which comprise at least two elements selected from the group consisting of Al, Si, Sb, Re, Ti and B and the balance being Zn with unavoidable impurities. The process for producing such alloy is also proposed. The invented alloy is excellent in cuttability, castability, hot and cold workability, corrosion resistance, mechanical properties and weldability and particularly applicable in spare parts, forging and casting which need cutting and grinding process. The cost of necessary metal materials of the invented alloy is lower than lead-free free-cutting bismuth and antimony brass alloy and is equivalent to lead-contained brass alloy.
Description
- This application is a continuation of U.S. patent application Ser. No. 12/208,043 filed on Sep. 10, 2008, which is a continuation-in-part of U.S. patent application Ser. No. 12/207,136 filed Sep. 9, 2008, which claims priority from Chinese Patent Application No. 200810110818.3 filed Jun. 11, 2008.
- The present invention generally relates to a magnesium brass alloy, especially a lead-free free-cutting magnesium brass alloy which is applicable in spare parts for a water supply system.
- It is well-known that lead-containing brass alloys such as CuZn40Pb1, C36000, C3604 and C3771 usually contain 1.0-3.7 wt % Pb for ensuring excellent free-cuttability.
- Lead-containing brass alloys are still widely used in the manufacture of many products due to their excellent cuttability and low cost. However, Pb-contaminated steam produced by the process of smelting and casting lead-contained brass alloy and Pb-contaminated dust produced in the process of cutting and grinding the lead-contained brass alloy are harmful to the human body and the environment. If the lead-containing brass alloys are used in drinking-water installations such as faucets, valves and bushings, contamination of the drinking water by Pb is unavoidable. In addition, toys which are produced by Pb-containing brass alloys are more harmful, as they are touched frequently, thus increasing potential exposure to Pb.
- Ingestion of lead by humans is harmful, so the use of lead is being strictly banned by law in many countries due to the concerns on health and environment. For dealing with this challenge, metallurgists and manufacturers of copper materials actively research and develop lead-free free-cutting brass alloys. Some of them use Si instead of Pb, but the cuttability is not remarkably improved and the cost increases due to the high quantity of copper. Therefore, silicon brass alloys are not commercially competitive at present. One commonly used type of lead-free free-cutting brass alloy is a bismuth brass alloy, which uses bismuth instead of Pb. Many kinds of bismuth brass alloys with high or low zinc have been developed and their formal alloy grades have been registered in the United States. These kinds of brass alloy contain valuable tin, nickel and selenium as well as bismuth. Although their cuttability is 85%-97% of lead-contained brass alloy C36000, their cost is far higher than lead-contained brass alloy C36000. Therefore, these kinds of bismuth brass alloys are not competitively priced. Bismuth brass alloys also have been researched and developed in Japan and China and filed in their Patent Office. Considering that bismuth element is expensive, rare in the reserves and has poor cold and hot workability, using a bismuth brass alloy instead of a lead-containing brass alloy may be financially problematic. The invention of a free-cutting antimony brass alloy which use Sb instead of Pb has been patented in China (ZL200410015836.5). A corresponding U.S.(US2006/0289094) is currently pending.
- One object of the present invention is to provide a magnesium brass alloy which will solve the limitations of conventional brass alloy discussed above especially the problem of lead contamination.
- One object of the present invention is to provide a lead-free magnesium brass alloy which is excellent in cuttability, castability, hot and cold workability and corrosion resistance and not harmful for the environment and the human body.
- One object of the present invention is to provide a lead-free free-cutting magnesium brass alloy which is particularly applicable in spare parts for water supply systems.
- One object of the present invention is to provide a manufacturing method for a magnesium brass alloy.
- The objects of the present invention are achieved as follows.
- The present invention is intended to provide a lead-free free-cutting magnesium brass alloy which comprises: 56.0 to 64.0 wt % Cu, 0.6 to 2.5 wt % Mg, 0.15 to 0.4 wt % P, other elements 0.002 to 0.9 wt %, (the said other elements comprise at least two elements selected from Al, Si, Sb, Re, Ti and B) and the balance being Zn with unavoidable impurities.
- The invented alloy is in the base of alpha-beta brass and realizes excellent cuttability by the fracture of intermetallic compounds Cu2Mg which is formed from element Mg and Cu.
- In the present invention, P is an important element. It improves castability, weldability, dezincification, and corrosion resistance of the invented alloy. The intermetallic compounds Cu3P which is formed from element P and Cu is complementary for the cuttability of the invented alloy. If the content of P is lower than 0.1 wt %, its benefit for cuttability of the magnesium brass alloy is not apparent. Therefore, the addition of P is preferably set in the range of 0.15 to 0.3 wt %, more preferably in the range of 0.2 to 0.29 wt % and most preferably in the range of 0.26 to 0.28 wt %.
- The invented alloy presents multi-component alloying and grain refining which favors the intermetallic compounds Cu2Mg and Cu3P in granular form to uniformly disperse in the interior and boundary of the crystal grain and improves plasticity of the alloy.
- The conventional brass alloy in the prior art usually contains a small amount of Mg (less than 0.01 wt %) for deoxidization and grain refining, contains a small amount of P (among 0.003 to 0.006 wt %) for deoxidization and for improving weldability of the brass alloy. In the present invention, the content of Mg and P is much higher than the prior art discussed above. The invented alloy has excellent integrated performance. The invented alloy actually is a kind of new lead-free magnesium brass alloy with a high level of P.
- Mg is one of the main elements of the invented alloy except for Zn. At 722° C., the solid solubility of Mg in the matrix of copper is 3.3 wt %. The solid solubility of Mg in the matrix of copper will be decreased rapidly with the temperature decrease. The solid solubility will be equivalent to zero when the temperature is equivalent to the room temperature, precipitated Mg with Cu will form brittle but not hard intermetallic compounds Cu2Mg. Considering this characteristic of Mg, Mg is selected as one of the main elements of the invented alloy for ensuring the cuttability of the invented alloy. Mg also has the effect of deoxidization, grain refining and dezincification corrosion resistance. However, with the increasing of Mg addition, the effects of dezincification corrosion resistance and castability will decrease. If the content of Mg exceeds 2.5 wt %, the effect of oxidization resistance of the invented alloy will decrease and the face of the ingot or castings will have a darker appearance. The addition of Mg is preferably set in the range of 0.5 to 2.0 wt % and more preferably in the range of 0.7 to 1.6 wt %.
- Among other elements, Sb is a beneficial element for improving dezincification corrosion resistance. When Mg and P are contained in the invented alloy, the content of Sb is preferably set in the range of 0 to 0.25 wt %. Al and Si have the effects of deoxidization, solid solution strengthening and corrosion resistance. If the content of Al and Si is higher, the flowability of the alloy melt will decrease. If the content of Si is higher, hard and brittle γ-phase will form from Si and Cu so that the plasticity of the alloy melt will decrease. Preferably the addition of Al and Si is separately set in the range of 0.1 to 0.4 wt %. Re, Ti and B are very effective in grain refinement. Most kinds of lead-free free-cutting brass alloy more or less comprise these elements. The invented alloy also contains one or two such elements for grain refinement. Re also could ease the intermetallic compounds to disperse in the boundary of crystal grain and partially transfer to the interior of crystal grain.
- Prior art alloys included the element Sn to improve corrosion resistance, amongst other reasons. However, the alloy of the present invention need not include Sn. This is an improvement over the prior art because it further reduces the cost of the alloy.
- Fe also could refine the crystal grains for brass alloy, but Fe without solution or precipitated Fe as temperature decreases will influence the corrosion resistance of the alloy and consume P which is an important element for the invented alloy. The amount of Fe as an unavoidable impurity in the invented alloy, is less than 0.05 wt %. The amount of Pb as an unavoidable impurity in the invented alloy, is less than 0.02 wt %.
- The cost of necessary metal materials of the invented alloy is lower than lead-free free-cutting bismuth brass alloy and antimony brass alloy and is equal to lead-contained brass alloy by election of alloy elements and design of element content.
- The manufacturing processing of the invented alloy is as follows:
- The raw materials used in the alloy in accordance with the invention include: electrolytic Cu, electrolytic Zn, brass scrap, magnesium alloy, Cu—P master alloy, Cu—Si master alloy, Cu—Ti master alloy, Cu—B master alloy, and optionally industrially pure Sb, Al, and Re. The raw materials are added in a non-vacuum intermediate frequency induction electric furnace with a quartz sand furnace lining, in the following order:
- First, electrolytic Cu, brass scraps, and covering agent that enhances slag removal efficiency are added to the furnace. These materials are heated until they have melted. Then the Cu—Si master alloy, Cu—Ti master alloy, and Cu—B master alloy are added to the melt. Thereafter, pure Sb, Al and Re may optionally be added. These materials are again heated until melted, and are thereafter stirred. Then electrolytic Zn is added to the melt. The melt is stirred, and slag is skimmed from the melt. The Cu—P master alloy is then added, and the melt is stirred further. At last the magnesium alloy is added, and the melt is stirred further. When the melt reaches a temperature of 995 to 1030 degrees Celsius, it is poured into ingot molds.
- The alloy ingots may be processed in different ways according to the method of the invention. First, the ingot may be extruded at a temperature between 550 to 720 degrees Celsius for about 1 hour with an elongation coefficient of greater than 30 to be formed, for example, into bar materials. Second, the ingot may be forged at a temperature between 580 and 680 degrees Celsius to be formed, for example, into a valve body for manufacturing water supply system components. Third, the ingot may be remelted and cast at a temperature between 995 to 1015 degrees Celsius at a pressure of 0.3 to 0.5 Mpa for manufacturing faucets.
- The advantages of the invented alloy are as follows. Smelting is processing in the atmosphere when the metals are protected with the covering agent. The addition of easily oxidized and volatile Mg is not effected by the addition of a conventional Cu'Mg master alloy or pure magnesium, but rather by Mg-based alloy whose melting point is lower than pure magnesium and boiling point is higher than pure magnesium. This reduces the consumption of Mg and is better to control the addition of Mg. Casting ingots rather than extruding bars are used to disposably form spare parts with complex structures for water supply systems by precision die forging. It could take out extruding process and save manufacturing cost. By die forging and extruding with an elongation coefficient greater than 30, the intermetallic compounds Cu2Mg and grain are further refined and dispersed uniformly thereby improving the mechanical properties of the invented alloy. The manufacturing method of the invented alloy is easy to carry out. And the equipments for production are the same as Pb-contained brass alloy.
- To understand the present invention, it will now be described by way of example, with reference to the accompanying drawings in which:
-
FIG. 1 shows the shapes of the cutting chips formed in Examples 1, 2 and 3. -
FIG. 2 shows the shapes of the cutting chips formed in Examples 4, 5 and 6. -
FIG. 3 shows the shapes of the cutting chips formed in Examples 7, 8 and 9. -
FIG. 4 shows the shapes of the cutting chips formed in cutting lead-contained brass alloy C36000 for comparison. - The alloy composition in examples is shown in Table 1. The alloy ingot is extruded at the temperature ranging from 580° C. to 700° C. with an elongation coefficient of greater than 30 into bar materials. Some alloy ingot is forged at the temperature ranging from 590° C. to 710° C. to be spare parts with a complex structure for a water supply system. Some alloy ingot is remelted at the temperature between 990 to 1015° C. to make faucets by low pressure die casting.
-
TABLE 1 Composition of lead-free free-cutting magnesium brass alloy (wt %) Examples Cu Mg P Sb Si Al Ti B Re Zn 1 59.25 0.58 0.29 0.21 0.38 0.20 0.04 0.0004 — Balance 2 59.20 0.61 0.26 <0.03 0.40 0.21 0.03 0.0003 — Balance 3 58.63 0.70 0.28 0.25 0.36 0.17 0.003 0.0003 0.005 Balance 4 59.80 0.89 0.20 0.16 0.33 0.15 0.03 0.0003 — Balance 5 59.76 0.94 0.15 0.11 0.35 0.10 0.02 0.0002 — Balance 6 58.89 0.97 0.18 <0.03 0.31 0.20 0.02 0.0002 — Balance 7 60.21 1.35 0.15 0.12 0.20 0.17 0.01 0.0001 — Balance 8 60.40 1.60 0.19 0.14 0.23 0.15 0.01 0.0001 — Balance 9 60.40 2.11 0.15 <0.03 0.16 0.10 0.01 0.0001 — Balance - The lead-free brass alloy of present invention has been tested with results as follows:
- 1. Cuttability Test:
- The samples for testing are in the half-hard state. The same cutting tool, cutting speed and feeding quantity (0.6 mm) is approached. The relative cutting ratio is calculated by testing cutting resistance of alloy C36000 and the invented alloy:
-
- It's assumed that the cutting ratio of alloy C36000 is 100%.
FIG. 4 shows the shapes of the cutting chips formed in cutting lead-containing brass C36000. Then the cutting ratio of examples 1, 2 and 3 is ≧80% by testing the cutting resistance of alloy C36000 and examples 1, 2 and 3 of the invented alloy.FIG. 1 shows the shapes of the cutting chips formed in Examples 1, 2 and 3. The cutting ratio of examples 4, 5 and 6 is ≧85% by testing the cutting resistance of alloy C36000 and examples 4, 5 and 6 of the invented alloy.FIG. 2 shows the shapes of the cutting chips formed in Examples 4, 5 and 6. The cutting ratio of examples 7, 8 and 9 is ≧90% by testing the cutting resistance of alloy C36000 and examples 7, 8 and 9 of the invented alloy.FIG. 3 shows the shapes of the cutting chips formed in Examples 7, 8 and 9. - Dezincification Corrosion Test:
- The test for dezincification corrosion resistance is conducted according to the PRC national standard GB10119-88. The samples for testing are in the stress relief annealing state. The test result is shown in Table 2.
- Stress Corrosion Test
- The sample for test is from extruded bar materials, casting and forging. The test for stress corrosion is conducted according to PRC national standard GB/T 10567.2-1997, Ammonia fumigation test. The test result is satisfactory when no crack appears in the face of the samples.
- Mechanical Properties Test
- The sample for testing are in half-hard state. The specification is φ6 mm bar. The test results are shown in table 2.
- Castability Test
- Several indexes can be used to measure the castability of the alloy. The test for conventional volume shrinkage and spiral simples is for measuring the flowability of the alloy. The test for cylindrical samples is for measuing shrinkage crack resistance of the alloy. The test for strip samples is for measuring linear shrinkage rate of the alloy. For volume shrinkage samples, as may be seen in Table 2, if the face of the concentrating shrinkage cavity is smooth, and no visible shrinkage porosity in the bottom of the concentrating shrinkage cavity, it indicates castability is excellent and will be shown as “∘” in Table 2. If the face of the concentrating shrinkage cavity is smooth but the height of visible shrinkage porosity in the bottom of the concentrating shrinkage cavity is less than 5 mm, it indicates castability is good, and will be shown as “Δ” in Table 2. If the face of the concentrating shrinkage cavity is not smooth and the height of visible shrinkage porosity in the bottom of the concentrating shrinkage cavity is more than 5 mm, it indicates castability is poor, and will be shown as “×” in Table 2. For strip samples, the linear shrinkage rate is not more than 1.5%. For cylindrical samples, as may be seen in Table 2, if no visible shrinkage crack is shown, it indicates castability is excellent and will be shown as “∘” in Table 2. If the visible shrinkage crack is shown, it indicates the castability is poor, and will be shown as “×” in Table 2. Spiral samples are for measuring the flowability of the invented alloy. The test results of castability are shown in Table 2. The above results indicate the castability of the alloy is fine.
-
TABLE 2 Dezincification corrosion, mechanical properties and castability of the invented alloy Examples 1 2 3 4 5 6 7 8 9 C36000 Dezincification layer 90 110 95 100 120 120 150 230 320 610 thickness/μm Mechanical Tensile 490 495 505 520 520 510 500 515 485 485 Properties strength/MPa 0.2% Yield 350 340 360 380 380 360 375 350 340 340 strength/MPa Elongation/% 13 14 12 12 11 12 10.6 10 9.5 9 Castability Concentrating ∘ ∘ ∘ ∘ ∘ ∘ ∘ ∘ □ ∘ shrinkage cavity Shrinkage ∘ ∘ ∘ ∘ ∘ ∘ ∘ ∘ ∘ ∘ crack Melt fluid 515 504 495 480 485 480 470 430 400 470 length/mm Linear 1.35~1.71 1.95~2.15 shrinkage rate/%
Claims (13)
1. A lead-free free-cutting magnesium brass alloy comprising: 56.0 to 64.0 wt % Cu, 1.0 to 2.5 wt % Mg, 0.20 to 0.4 wt % P, and other elements 0.002 to 0.9 wt % which comprise at least two elements selected from the group consisting of Al, Si, Sb, Re, Ti and B and the balance being Zn with unavoidable impurities.
2. The lead-free free-cutting magnesium brass alloy of claim 1 wherein the content of P is between 0.20 to 0.3 wt %
3. The lead-free free-cutting magnesium brass alloy of claim 2 wherein the content of P is between 0.2 to 0.29 wt %.
4. The lead-free free-cutting magnesium brass alloy of claim 1 wherein the content of Mg is between 1.0 to 2.0 wt %.
5. The lead-free free-cutting magnesium brass alloy of claim 4 wherein the content of Mg is between 1.0 to 1.6 wt %.
6. (canceled)
7. The lead-free free-cutting magnesium brass alloy of claim 5 wherein other elements are selected from Ti and B.
8. The lead-free free-cutting magnesium brass alloy of claim 1 wherein the content of other elements is between 0.003 to 0.8 wt %.
9. The lead-free free-cutting magnesium brass alloy of claim 8 wherein the content of other elements is between 0.003 to 0.05 wt %.
10. (canceled)
11-14. (canceled)
15. The lead-free free-cutting magnesium brass alloy of claim 1 wherein the cutting ratio percentage of said alloy is at least 85%.
16. The lead-free free-cutting magnesium brass alloy of claim 1 wherein the cutting ratio percentage of said alloy is at least 90%.
Priority Applications (2)
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US12/354,510 US20090311130A1 (en) | 2008-06-11 | 2009-01-15 | Tin-free, lead-free free-cutting magnesium brass alloy and its manufacturing method |
US12/631,603 US8425697B2 (en) | 2008-06-11 | 2009-12-04 | Tin-free lead-free free-cutting magnesium brass alloy |
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CN2008101108183A CN101285137B (en) | 2008-06-11 | 2008-06-11 | Leadless and free-cutting brass containing magnesium and manufacturing method for manufactures |
CN200810110818.3 | 2008-06-11 | ||
US20713608A | 2008-09-09 | 2008-09-09 | |
US20804308A | 2008-09-10 | 2008-09-10 | |
US12/354,510 US20090311130A1 (en) | 2008-06-11 | 2009-01-15 | Tin-free, lead-free free-cutting magnesium brass alloy and its manufacturing method |
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US20804308A Continuation-In-Part | 2008-06-11 | 2008-09-10 |
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US12/631,603 Continuation US8425697B2 (en) | 2008-06-11 | 2009-12-04 | Tin-free lead-free free-cutting magnesium brass alloy |
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US12/354,510 Abandoned US20090311130A1 (en) | 2008-06-11 | 2009-01-15 | Tin-free, lead-free free-cutting magnesium brass alloy and its manufacturing method |
US12/354,582 Abandoned US20090311127A1 (en) | 2008-06-11 | 2009-01-15 | Lead-free free-cutting magnesium brass alloy and its manufacturing method |
US12/631,603 Active US8425697B2 (en) | 2008-06-11 | 2009-12-04 | Tin-free lead-free free-cutting magnesium brass alloy |
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US12/631,603 Active US8425697B2 (en) | 2008-06-11 | 2009-12-04 | Tin-free lead-free free-cutting magnesium brass alloy |
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US (3) | US20090311130A1 (en) |
EP (1) | EP2133437B1 (en) |
CN (1) | CN101285137B (en) |
CA (1) | CA2639394C (en) |
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CN106032558A (en) * | 2015-03-19 | 2016-10-19 | 百路达(厦门)工业有限公司 | Lead-free and free-cutting brass alloy with excellent stress corrosion resistance as well as preparation method thereof |
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Also Published As
Publication number | Publication date |
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EP2133437A1 (en) | 2009-12-16 |
CN101285137B (en) | 2010-06-02 |
CN101285137A (en) | 2008-10-15 |
ES2368749T3 (en) | 2011-11-22 |
CA2639394C (en) | 2011-11-22 |
US8425697B2 (en) | 2013-04-23 |
EP2133437B1 (en) | 2011-06-15 |
US20090311127A1 (en) | 2009-12-17 |
PL2133437T3 (en) | 2011-11-30 |
CA2639394A1 (en) | 2009-01-12 |
US20100080731A1 (en) | 2010-04-01 |
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