Low-lead free-cutting anti-corrosion tin-brass alloy material

Abstract

The invention discloses a low-lead free-cutting anti-corrosion tin-brass alloy material. The material includes the following components: 60.0 to 65.0 percent of Cu (copper), 0.5 to 1.5 percent of Sn (tin), 0.1 to 0.7 percent of Si (silicon), 0.02 to 0.12 percent of As (arsenic), 0.002 to 0.015 percent of B (boron), 0.01 to 0.25 percent of Pb (plumbum), 0.03 to 0.3 percent of Bi (bismuth), Sb (antimony) and P (phosphorus), as well as zinc and no more than 0.25 percent of impurities, wherein the Bi content is less than 0.10 percent, the Sb content is less than 0.10 percent, the P content ranges from 0.01 percent to 0.1 percent, the Fe (ferrum) content is less than 0.1 percent, the Ni (nickel) content is less than 0.1 percent, the Al (aluminum) content is less than 0.1 percent, the weight ratio of Si and Sn is 0.1-0.5 to 1, and the weight ratio of As and B is 5-60 to 1. The low-lead free-cutting anti-corrosion tin-brass alloy material has the advantages of high machinability, good cold / hot working property, mechanical property and welding property, as well as high dezincification resistance and stress corrosion resistance.

Description

Technical field: [0001] The present invention relates to a low-lead (Pb 0.01-0.25%) tin yellow which is easy to cut and has excellent corrosion resistance (the maximum resistance to dezincification is below 100um (micron)), good cutting performance, cold and hot processing performance, mechanical performance and welding performance. Copper alloy material. Background technique: [0002] Since 2014 in the United States, pipe fittings, valves and other objects in contact with drinking water need to implement the laws of California. That is, the lead content of metal materials in contact with drinking water shall not be higher than 0.25%. Developed countries such as Japan, Europe, and Canada have followed suit one after another. my country has also promulgated the standards for lead precipitation in water immersion tests for metal materials that are in contact with drinking water. Strict restrictions are imposed on the lead content in metal materials. At present, the lead-fre...

AI Technical Summary

Problems solved by technology

Silicon brass with high copper content (greater than >70%) can meet the requirements of materials against dezincification, but silicon brass has high copper content, high cost and poor economy

The dezincification resistance and cutting performance of H62 and H59 cannot meet the requirements

The processing performance and dezincification resistance of C46500 can not meet the requirements. Bismuth brass and silicon bismuth brass are not well accepted by the market due to the bismuth content, which is difficult to accept.

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