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Environment-friendly lead-free easily-cutting anti-heat-cracking brass alloy material and preparation method thereof

A brass alloy and free-cutting technology is applied in the field of environmentally friendly lead-free free-cutting hot-crack-resistant brass alloy materials and their preparation, which can solve the problem of difficulty in taking into account cutting performance and cold and hot processing performance, high price of rare earth elements, and the addition of rare earth elements. There are many types of elements, etc., to achieve the effects of excellent thermal crack resistance, simple production equipment and process, and excellent cutting performance.

Inactive Publication Date: 2016-08-31
SICHUAN XINJU MINERAL RESOURCE DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, lead-free brass with bismuth replacing lead is the most researched. Throughout the various researches on bismuth brass by experts and scholars at home and abroad, there are many types of added elements, large amount of added elements, high price of rare earth elements, high cost of raw materials and Difficulty in industrial application and other problems, and it is difficult to balance excellent cutting performance and cold and hot processing performance

Method used

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  • Environment-friendly lead-free easily-cutting anti-heat-cracking brass alloy material and preparation method thereof
  • Environment-friendly lead-free easily-cutting anti-heat-cracking brass alloy material and preparation method thereof
  • Environment-friendly lead-free easily-cutting anti-heat-cracking brass alloy material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] (1) Melting

[0048] Add 58 parts of cathode copper into the smelting furnace, and heat up and melt under the cover of charcoal protective agent; after the cathode copper is completely melted, add 0.03 part of phosphor-bronze master alloy for deoxidation to avoid selenium dioxide poisoning during the process of adding selenium; adjust the furnace temperature to 1150°C, add 0.03 parts of high-purity selenium, add 0.3 parts of high-purity tin and 0.4 parts of high-purity bismuth successively, after completely melting, stir the molten pool, adjust the temperature of the molten pool to 1020 °C, add 43 parts of electrolytic zinc, and heat up the slag , adjust the molten pool temperature to 1000 ℃, slag casting or traction molding.

[0049] (2) extrusion

[0050] Casting or traction-molded ingots, after passing the composition and surface quality inspections, are placed in an induction furnace, heated to 70±5°C, and kept warm for 5 minutes to make the grains evenly refined, ...

Embodiment 2

[0057] (1) Melting

[0058] Put 64 parts of cathode copper into the smelting furnace, and under the cover of charcoal protective agent, heat up and melt; after the cathode copper is completely melted, add 0.05 part of phosphor-bronze master alloy for deoxidation to avoid selenium dioxide poisoning during the process of adding selenium; adjust the furnace temperature to 1250°C, add 0.2 parts of high-purity selenium, add 0.7 parts of high-purity tin and 1.5 parts of high-purity bismuth successively, after completely melting, stir the molten pool, adjust the temperature of the molten pool to 1020-1050 °C, add 36 parts of electrolytic zinc, and heat up To melt slag, adjust the temperature of the molten pool to 1000-1050°C, and then slag-removed for casting or traction molding.

[0059] (2) extrusion

[0060] Casting or traction-molded ingots, after passing the composition and surface quality inspections, are placed in an induction furnace, heated to 650±5°C, and kept for 10 minutes...

Embodiment 3

[0066] (1) Melting

[0067] Put 60 parts of cathode copper into the smelting furnace, and under the cover of charcoal protective agent, heat up and melt; after the cathode copper is completely melted, add 0.04 part of phosphor-bronze master alloy for deoxidation to avoid selenium dioxide poisoning during the process of adding selenium; adjust the furnace temperature to 1200℃, add 0.1 parts of high-purity selenium, add 0.7 parts of high-purity tin and 0.8 parts of high-purity bismuth successively, after completely melting, stir the molten pool, adjust the temperature of the molten pool to 1020-1050 °C, add 40 parts of electrolytic zinc, and heat up To melt slag, adjust the temperature of the molten pool to 1000-1050°C, and then slag-removed for casting or traction molding.

[0068] (2) extrusion

[0069] Casting or traction-molded ingots, after passing the composition and surface quality inspections, are placed in an induction furnace, heated to 640±5°C, and kept for 8 minutes...

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Abstract

The invention discloses an environment-friendly lead-free easily-cutting anti-heat-cracking brass alloy material and a preparation method thereof. The brass alloy material is characterized by comprising, by weight, 58-64 parts of Cu, 0.4-1.5 parts of Bi, 0.3-0.7 part of Sn, 0.03-0.2 part of Se, 34-41 parts of Zn, and less than 0.2 part of other impurities. The alloy material with the required specifications is prepared through the steps of conventional material preparation, batching, smelting and cold and hot machining. The tensile strength sigma b of the brass alloy material is 400-550 MPa, the hardness HRB of the brass alloy material is 65-80, and the elongation delta of the brass alloy material is greater than 10%. The contents of Pb, Fe and Cd of the brass alloy material meet the national standards, and the brass alloy material has excellent cutting performance and cold and hot machining performance and is applicable to various kinds of connecting parts, valves, valve rod bearings, plumbing bathroom accessories, electronic products and clock instruments.

Description

technical field [0001] The invention relates to an environment-friendly lead-free easy-cutting heat-cracking-resistant brass alloy material and a preparation method thereof, belonging to the field of synthesis of metal materials. Background technique [0002] Lead brass is widely used in various connectors, valves, valve stem bearings, plumbing and sanitary ware, electronic appliances, watch instruments and other fields. However, lead is an element harmful to the environment and the human body. Since 2006, countries around the world including the United States, the European Union, Japan, and China have imposed strict restrictions on the lead content in copper alloys and the leaching of lead in drinking water. The application of leaded brass faces strict restrictions and challenges. [0003] The development of lead-free free-cutting copper alloys to replace lead brass has become a major issue in the metal material manufacturing industry in the world today. At present, lead-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/04C22C1/02C22F1/08
CPCC22C9/04C22C1/02C22F1/08
Inventor 吕忠华侯龙超侯仁义
Owner SICHUAN XINJU MINERAL RESOURCE DEV CO LTD
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