CN114540662B - Brass alloy and preparation method thereof - Google Patents
Brass alloy and preparation method thereof Download PDFInfo
- Publication number
- CN114540662B CN114540662B CN202210162683.5A CN202210162683A CN114540662B CN 114540662 B CN114540662 B CN 114540662B CN 202210162683 A CN202210162683 A CN 202210162683A CN 114540662 B CN114540662 B CN 114540662B
- Authority
- CN
- China
- Prior art keywords
- copper
- brass
- alloy
- molten copper
- weight percent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
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
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Forging (AREA)
Abstract
The invention discloses a brass alloy which is characterized by comprising the following components in percentage by mass: 59-63 wt%, si:0.2 to 0.8 weight percent of Sn:0.4 to 1.0 weight percent of Pb:0.05 to 0.15 weight percent of Al:0.1 to 0.2wt percent As:0.02 to 0.15wt% of Zn and unavoidable impurities in balance. The alloy of the invention meets the environmental protection requirement, and simultaneously utilizes the proportion control of Cu and Si elements and the addition of Sn and As elements to obtain 10-25% of beta phase, thereby being capable of reaching the standard of dezincification corrosion resistance test below 100 microns, greatly reducing the failure of products in the valve and bathroom industries caused by dezincification, and simultaneously solving the problem that the conventional dezincification resistant alpha single-phase brass is difficult to be hot forged.
Description
Technical Field
The invention belongs to the technical field of copper alloy, and particularly relates to a brass alloy and a preparation method thereof.
Background
Brass alloy is lead brass which is most widely used, because lead is not basically dissolved in copper-zinc alloy and is generally distributed on grain boundaries in free particles, cutting chips are easy to break during material turning, and meanwhile, the lead brass has a lubricating effect, so that the lead brass has good cutting performance. However, with the development of society, people find that the materials can have a great influence on human health in the use process, especially in the valve and water heating bathroom industry, the damage to the brain center and the nervous system can be caused by the excessive lead content in water, and the influence on the digestive system, the blood system and the immune system can be caused. So that the government of each country has continuously put on related laws and regulations to strictly limit the application range and content of lead brass. The NSF standard in the united states and the JIS standard in japan and the GB standard in China are all regulated with respect to the heavy metal deposition amount of the drinking water contact product. Therefore, in recent years, a plurality of lead-free and low-lead series free-cutting brass has been developed at home and abroad, and the machinability improvement is realized mainly by replacing lead with bismuth, replacing lead with silicon, replacing lead with antimony and the like, and the comprehensive performance of the brass is improved by adding other alloy elements. In the industries of valves and water heating bathrooms, bismuth brass is easy to generate defects in the hot processing process, and the problems of difficult recycling and poor welding performance and the like of the corner materials are solved, so that bismuth is replaced by lead and cannot be implemented on a large scale. Antimony brass has toxicity because of antimony, and the precipitation test of valve and water nozzle products cannot meet the requirement of 0.6 mug/L as specified by NSF61 standard, and has hidden danger of harming human health, so the antimony brass cannot be applied to valve and water heating bathroom industries.
Besides the requirements of environmental protection and free cutting, valve and water heating products are generally produced by hot forging, so that brass materials are required to have excellent hot forging performance. In addition, the service performance of the brass is dezincification corrosion resistance and mirror polishing performance, because dezincification corrosion of brass is one of the main failure modes, and polishing is for the beautiful and elegant appearance of the final water heating bathroom product. Among these, dezincification corrosion of brass is a selective corrosion, and generally takes on two forms, one is uniform layered dezincification and one is plug corrosion. The requirements of dezincification corrosion resistance and the testing method are specified no matter the ISO standard, the Australian AS standard and the national GB standard. The quality of dezincification corrosion resistance often determines the service life of the product.
Disclosure of Invention
The first technical problem to be solved by the invention is to provide a brass alloy with low lead content and excellent cutting, hot forging and dezincification corrosion resistance.
The invention solves the first technical problem by adopting the technical scheme that: the brass alloy is characterized by comprising the following components in percentage by mass: 59-63 wt%, si:0.2 to 0.8 weight percent of Sn:0.4 to 1.0 weight percent of Pb:0.05 to 0.15 weight percent of Al:0.1 to 0.2wt percent As:0.02 to 0.15wt% of Zn and unavoidable impurities in balance.
The brass is alpha+beta double-phase brass, cu is a main element for determining the proportion of alpha phase, and the content of Cu is limited to 59-63 wt% by combining the content of other elements, so that the required alpha phase and beta phase proportion is obtained.
Si mainly improves the casting and cutting properties of the alloy, and at the same time, since the zinc equivalent of Si is 10, the proportion of the α phase is reduced, and the β phase ratio required in the product is also ensured. However, as the Si content increases, dezincification corrosion resistance becomes poor, so that the Si content should not be too high and should be controlled to be 0.2 to 0.8wt% in order to ensure dezincification corrosion resistance.
The Sn improves dezincification corrosion resistance, and the better the dezincification corrosion resistance with the increase of the Sn content, so that the Sn content is controlled to be 0.4-1.0 wt%, and the excessive Sn content can cause the influence of cutting performance and increase the raw material cost of the product.
The Al element can improve the fluidity of the alloy, improve the hot forging performance and increase the tensile strength of the alloy, but the too high content of the Al can enlarge the beta phase to influence the dezincification resistance, so the content of the Al element is controlled to be 0.1-0.2 wt%.
As element can block Cu 2+ The zinc removal corrosion resistance of the brass can be obviously inhibited, and the copper-arsenic alloy mode is adopted to add the copper-arsenic alloy, so that the copper-arsenic alloy type copper-arsenic alloy composite material is more environment-friendly and effective than the direct addition of simple substance arsenic. As is controlled in the range of 0.02-0.15 wt%, and too high As cannot meet the precipitation standard of drinking water systems in various countries or regions.
Preferably, the matrix structure of the brass alloy comprises an alpha phase and a beta phase, and the area ratio of the beta phase is 10-25%. The brass is alpha+beta double-phase brass, alpha-phase atoms are distributed in a face-centered cubic structure, and the brass has good plasticity, so that the material can be smoothly subjected to cold working deformation. The beta phase ratio determines dezincification resistance and hot forging resistance of the brass of the invention, and if the beta phase is high, dezincification resistance cannot be achieved, and if the beta phase is less, the hot forging performance is poor, so the area ratio of the beta phase is 10-25%.
Preferably, the brass alloy has a dezincification corrosion resistance depth of 100 μm or less, and a machinability index of 65% or more of that of lead brass HPb 59-1.
The second technical problem to be solved by the invention is to provide a preparation method of brass alloy.
The invention solves the second technical problem by adopting the technical scheme that: a preparation method of a brass alloy is characterized by comprising the following steps: the preparation method comprises the following preparation steps:
1) And (3) batching: weighing Cu, si, sn, pb, al, zn and copper-arsenic intermediate alloy and aluminum rare earth according to the required components;
2) Smelting: adding Cu, si and Sn into a power frequency smelting furnace with the voltage of 350-400V, stirring and melting, reducing the power of the smelting furnace after the Cu, si and Sn are melted, controlling the temperature to 1000-1050 ℃, adding Pb, al, zn and copper-arsenic intermediate alloy into the furnace for melting, stirring after the materials are melted, adding a brass slag remover, and fishing out slag by using a slag fishing tool;
3) Component testing: sampling in molten copper, detecting the components of the molten copper, controlling the temperature of molten copper at 950-1000 ℃ after the components meet the requirements, pressing aluminum rare earth to be molten below the liquid level of the molten copper according to 0.1-0.3 wt% of the total adding amount, heating the molten copper to 1100-1150 ℃, spraying fire for 2-5 min, controlling the molten copper to keep the temperature of 1050-1100 ℃ and standing for 5-10 min, and then converting the molten copper in a smelting furnace to a heat-preserving furnace;
4) Casting: continuously casting and leading out a copper bar blank;
5) Drawing: drawing the copper bar blank into a copper bar;
6) Annealing: the copper bar is insulated for 3 to 4 hours at the temperature of 450 to 520 ℃, and is cooled to below 100 ℃ according to the cooling speed of 120 to 180 ℃ per hour after being discharged.
In the annealing heat treatment process, the temperature of the copper bar is increased to be more than 450 ℃ so that alpha+beta phase is converted to alpha phase, the temperature is not too high and the time is not too long, or grains slowly grow up, and the recrystallization conversion cannot be completed if the temperature is low. The copper bar needs to be cooled rapidly after being discharged from the furnace, the beta phase begins to precipitate again and is dispersed, if the cooling speed is insufficient, the beta phase is continuously distributed in a strip shape, so that the dezincification corrosion resistance is poor, and therefore, the copper bar is cooled to below 100 ℃ according to the cooling speed of 120-180 ℃/h after being discharged from the furnace.
Compared with the prior art, the invention has the advantages that:
1) The alloy of the invention meets the environmental protection requirement, and simultaneously utilizes the proportion control of Cu and Si elements and the addition of Sn and As elements to obtain 10-25% of beta phase, thereby being capable of reaching the standard of dezincification corrosion resistance test below 100 microns, greatly reducing the failure of products in the valve and bathroom industries caused by dezincification, and simultaneously solving the problem that the conventional dezincification resistant alpha single-phase brass is difficult to be hot forged.
2) The brass alloy does not contain Sb element, has extremely low Pb content, and can meet the lead precipitation limit of drinking water contact products such as NSF61, BS6920, GB18145 and the like. The alloy does not contain Bi element, is suitable for wide application and popularization, and does not have the problem of difficult waste recovery. The cutting performance of the material is improved by adding Si. Meanwhile, the polishing performance of the product is excellent, and the market competition advantage is obvious.
Detailed Description
The present invention is described in further detail below with reference to examples.
The present invention provides 3 examples and 1 comparative example, examples being components of the present invention and prepared according to the preparation method of the present invention.
Example 1
The brass alloy composition is 61.5wt% Cu, 0.3wt% Si, 0.6wt% Sn, 0.1wt% Pb, 0.1wt% Al, 0.1wt% As, and the balance Zn.
The preparation method of the brass alloy comprises the following steps:
1) And (3) batching: cu, si, sn, pb, al, zn and copper-arsenic intermediate alloy are weighed, wherein the copper content of the copper-arsenic intermediate alloy is 70wt% and the aluminum content of the aluminum rare earth is 90wt%.
2) Smelting: adding Cu, si and Sn into a power frequency smelting furnace with 380V voltage, stirring and melting, reducing the power of the smelting furnace after the Cu, si and Sn are melted, controlling the temperature to be 1000-1050 ℃, adding Pb, al, zn and copper-arsenic alloy into the furnace for melting, stirring after the materials are melted, adding a brass slag remover, and fishing out the slag by using a slag fishing tool.
3) Component testing: sampling in molten copper, detecting components of the molten copper, performing corresponding dilution or compensation treatment until the components meet the requirements, controlling the temperature of molten copper to 950-1000 ℃ after the components meet the requirements, pressing aluminum rare earth to be below the molten copper liquid level by 0.2wt% of the total adding amount to melt, heating the molten copper to 1100-1150 ℃, spraying fire for 2-5 min, controlling the molten copper to keep the temperature of 1050-1100 ℃ and standing for 5-10 min, and then converting the molten copper of a smelting furnace into a heat preservation furnace;
4) Casting: adopting continuous casting to cast a copper bar blank with the specification of 42.5mm;
5) Drawing: drawing the copper bar blank into a copper bar with the diameter of 41mm;
6) Annealing: the copper bar is insulated for 3 hours at 490 ℃, and cooled to below 100 ℃ according to the cooling speed of 150 ℃ per hour after being discharged.
Example 2
The brass alloy composition is 61.7wt% Cu, 0.35wt% Si, 0.7wt% Sn, 0.13wt% Pb, 0.1wt% Al, 0.12wt% As, and the balance Zn.
The preparation method of the brass alloy comprises the following steps:
1) And (3) batching: cu, si, sn, pb, al, zn and copper-arsenic intermediate alloy are weighed, wherein the copper content of the copper-arsenic intermediate alloy is 70wt% and the aluminum content of the aluminum rare earth is 90wt%.
2) Smelting: adding Cu, si and Sn into a power frequency smelting furnace with 380V voltage, stirring and melting, reducing the power of the smelting furnace after the Cu, si and Sn are melted, controlling the temperature to be 1000-1050 ℃, adding Pb, al, zn and copper-arsenic alloy into the furnace for melting, stirring after the materials are melted, adding a brass slag remover, and fishing out the slag by using a slag fishing tool.
3) Component testing: sampling in molten copper, detecting components of the molten copper, performing corresponding dilution or compensation treatment until the components meet the requirements, controlling the temperature of molten copper to 950-1000 ℃ after the components meet the requirements, pressing aluminum rare earth to be below the molten copper liquid level by 0.2wt% of the total adding amount to melt, heating the molten copper to 1100-1150 ℃, spraying fire for 2-5 min, controlling the molten copper to keep the temperature of 1050-1100 ℃ and standing for 5-10 min, and then converting the molten copper of a smelting furnace into a heat preservation furnace;
4) Casting: casting a copper bar blank by adopting continuous casting for 31.5mm;
5) Drawing: drawing the copper bar blank into a copper bar with the thickness of 30mm;
6) Annealing: the copper rod is insulated for 3.5 hours at 480 ℃, and cooled to below 100 ℃ according to the cooling speed of 160 ℃ per hour after being discharged from the furnace.
Example 3
The brass alloy composition is 62.5wt% Cu, 0.2wt% Si, 0.6wt% Sn, 0.1wt% Pb, 0.1wt% Al, 0.1wt% As, and the balance Zn.
The preparation method of the brass alloy comprises the following steps:
1) And (3) batching: cu, si, sn, pb, al, zn and copper-arsenic intermediate alloy are weighed, wherein the copper content of the copper-arsenic intermediate alloy is 70wt% and the aluminum content of the aluminum rare earth is 90wt%.
2) Smelting: adding Cu, si and Sn into a power frequency smelting furnace with the voltage of 390V, stirring and melting, reducing the power of the smelting furnace after the Cu, si and Sn are melted, controlling the temperature to be 1000-1050 ℃, adding Pb, al, zn and copper-arsenic alloy into the furnace for melting, stirring after the materials are melted, adding a brass slag remover, and fishing out the slag by using a slag fishing tool.
3) Component testing: sampling in molten copper, detecting components of the molten copper, performing corresponding dilution or compensation treatment until the components meet the requirements, controlling the temperature of molten copper to 950-1000 ℃ after the components meet the requirements, pressing aluminum rare earth to be below the molten copper liquid level by 0.2wt% of the total adding amount to melt, heating the molten copper to 1100-1150 ℃, spraying fire for 2-5 min, controlling the molten copper to keep the temperature of 1050-1100 ℃ and standing for 5-10 min, and then converting the molten copper of a smelting furnace into a heat preservation furnace;
4) Casting: continuously casting and leading out a copper bar blank by 20mm;
5) Drawing: drawing the copper bar blank into a copper bar 19mm;
6) Annealing: the copper bar is insulated for 3 hours at 500 ℃, and cooled to below 100 ℃ according to the cooling speed of 150 ℃ per hour after being discharged.
Comparative example: american standard number C46500:61.5wt% Cu, 0.82wt% Sn, 0.15wt% Pb,0.052wt% As, the balance being Zn.
The microstructure, machinability, polishing performance, dezincification corrosion resistance, and hot forging performance of the examples and comparative examples were tested. The specific test method is as follows, and the test results are shown in table 1.
And (3) microstructure detection: the beta phase ratio was measured according to the method defined in GB/T15749-2008 (quantitative metallographic measurement method) under item 4.6 (image analyzer measurement method).
Cutting performance test: the cutting index was evaluated according to the chip size using HPb59-1 as a reference by performing a machining test with a lathe at a rotational speed of 500r/min and a machining amount of 0.3 mm.
Polishing performance test: taking not less than 50cm 2 The outer circumferential surface of the bar is polished by a 320-mesh abrasive belt, then by a 600-mesh abrasive belt, and finally polished by a thick and a thin Braun, the surface roughness of the bar is not more than 0.2 mu m, and then the quality points of the polished surface are observed.
Dezincification corrosion resistance: the samples were tested according to the ISO 6509 Corrosion of metals and alloys-Determination of dezincification resistance of brass standard.
Hot forging performance test: the sample was heated to 650 c and free forging was performed using a 40 ton hot forging press to see if there was edge cracking.
Table 1 properties of inventive examples and comparative examples
Claims (1)
1. A preparation method of a brass alloy is characterized by comprising the following steps: the brass alloy comprises the following components in percentage by mass: 59-63 wt%, si:0.2 to 0.35 weight percent of Sn:0.4 to 1.0 weight percent of Pb:0.05 to 0.15 weight percent of Al:0.1 to 0.2wt percent As:0.02 to 0.15 weight percent, and the balance of Zn and unavoidable impurities;
the preparation method comprises the following preparation steps:
1) And (3) batching: weighing Cu, si, sn, pb, al, zn and copper-arsenic intermediate alloy and aluminum rare earth according to the required components;
2) Smelting: adding Cu, si and Sn into a power frequency smelting furnace with the voltage of 350-400V, stirring and melting, reducing the power of the smelting furnace after the Cu, si and Sn are melted, controlling the temperature to 1000-1050 ℃, adding Pb, al, zn and copper-arsenic intermediate alloy into the furnace for melting, stirring after the materials are melted, adding a brass slag remover, and fishing out slag by using a slag fishing tool;
3) Component testing: sampling in molten copper, detecting the components of the molten copper, controlling the temperature of molten copper at 950-1000 ℃ after the components meet the requirements, pressing aluminum rare earth to be molten below the liquid level of the molten copper according to 0.1-0.3 wt% of the total adding amount, heating the molten copper to 1100-1150 ℃, spraying fire for 2-5 min, controlling the molten copper to keep the temperature of 1050-1100 ℃ and standing for 5-10 min, and then converting the molten copper in a smelting furnace to a heat-preserving furnace;
4) Casting: continuously casting and leading out a copper bar blank;
5) Drawing: drawing the copper bar blank into a copper bar;
6) Annealing: the copper bar is insulated for 3 to 4 hours at the temperature of 450 to 520 ℃, and is cooled to below 100 ℃ according to the cooling speed of 120 to 180 ℃ per hour after being discharged from the furnace;
the basal body structure of the brass alloy comprises an alpha phase and a beta phase, wherein the area ratio of the beta phase is 10-25%;
the dezincification corrosion resistance depth of the brass alloy is below 100 microns, and the machinability index reaches more than 65% of lead brass HPb 59-1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210162683.5A CN114540662B (en) | 2022-02-22 | 2022-02-22 | Brass alloy and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210162683.5A CN114540662B (en) | 2022-02-22 | 2022-02-22 | Brass alloy and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114540662A CN114540662A (en) | 2022-05-27 |
| CN114540662B true CN114540662B (en) | 2023-04-28 |
Family
ID=81676561
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210162683.5A Active CN114540662B (en) | 2022-02-22 | 2022-02-22 | Brass alloy and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114540662B (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160145719A1 (en) * | 2014-01-03 | 2016-05-26 | Jiaxing Idc Plumbing & Heating Technology Ltd. | Low-lead bismuth-free silicon-free brass |
| CN104404293A (en) * | 2014-11-27 | 2015-03-11 | 恒吉集团有限公司 | Low-lead free-cutting anti-corrosion tin-brass alloy material |
| CN107841651B (en) * | 2017-11-22 | 2020-08-11 | 龙岩市鸿航金属科技有限公司 | Preparation method of dezincification-resistant lead-free low-silicon arsenic brass tube |
-
2022
- 2022-02-22 CN CN202210162683.5A patent/CN114540662B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN114540662A (en) | 2022-05-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2952596B1 (en) | Lead-free easy-to-cut corrosion-resistant brass alloy with good thermoforming performance | |
| EP2133437B1 (en) | Tin-free lead-free free-cutting magnesium brass alloy and its manufacturing method | |
| CN101619404B (en) | Easy-cutting lead-free brass alloy for forging and preparation method thereof | |
| WO2016177018A1 (en) | Cuttable machinable brass alloy and manufacturing method | |
| CN104480344B (en) | A kind of phosphorous easily-cut silicon brass alloy and preparation method thereof | |
| CN102560190B (en) | High-zinc leadless brass alloy and preparation method thereof | |
| CN111655878B (en) | Easy-cutting lead-free copper alloy without containing lead and bismuth | |
| CA2732350A1 (en) | An environment-friendly manganese brass alloy and manufacturing method thereof | |
| EP2133438A1 (en) | Lead-free free-cutting phosphorus brass alloy and its manufacturing method | |
| CN111235427B (en) | Free-cutting brass alloy and preparation method and application thereof | |
| WO2015100872A1 (en) | Low-lead bismuth-free silicone-free brass | |
| US5507885A (en) | Copper-based alloy | |
| CN102286674A (en) | Environment-friendly silicon tin brass suitable for forging and preparation method thereof | |
| CN114540662B (en) | Brass alloy and preparation method thereof | |
| CN110747369A (en) | Lead-free-cutting silicon-magnesium-calcium brass alloy and preparation method thereof | |
| CN101423905A (en) | Leadless free-cutting Sb-Mg brass alloys | |
| US4007039A (en) | Copper base alloys with high strength and high electrical conductivity | |
| US3253910A (en) | Copper base alloys and the method of treating the same to improve their machinability | |
| CN115679164A (en) | 5xxx aluminum alloys, and methods of making the same | |
| CN110791679B (en) | Brass alloy and production method thereof | |
| CN102400011A (en) | Low-lead anti-corrosion forging yellow brass alloy and manufacturing method thereof | |
| CN115449655B (en) | Brass and preparation method thereof | |
| CN105886835A (en) | Nonleaded free-cutting silicon-bismuth brass and preparation method thereof | |
| CN110273082B (en) | Silicon-bismuth lead-free casting brass alloy and preparation method thereof | |
| CN112063882B (en) | Lead-free copper alloy for casting and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |