Remelted low-lead low-bismuth copper alloy with no hot crack

Abstract

The invention discloses a remelted low-lead low-bismuth copper alloy with no hot crack and relates to the field of metal alloy material manufacturing technology. The remelted low-lead low-bismuth copper alloy with no hot crack comprises the following components of: by weight, 58-61% of Cu, 0.3-0.8% of Al, 0.009-0.35% of Zr, 0.008-0.035% of B, 0.05-0.20% of Pb, 0.1-0.40% of Bi, Mn being less than 0.15%, Si being less than 0.15%, Sn being less than 0.35%, Fe being less than 0.35%, and the balance being zinc and unavoidable impurities, wherein the total amount of the impurities is less than 0.25%. According to the copper alloy, the contents of the lead element and the bismuth element are minimized, thus reducing the harm to the environment and human body and decreasing the cost; The purity of gravity ingot casting melting is excellent, fluidity of the casting process is excellent, and thermal stress crack resistance is strong; the density of the microstructure is high, and crystal grains are fine and uniform; the cutting ability is raised, the polishing degree is excellent, there is no welding stress crack, the corrosion resistance is raised, and old copper materials can be recycled and reused while the cutting ability of the copper alloy is guaranteed.

Description

Technical field [0001] The invention involving the manufacturing technology field of metal alloy materials is specifically involved in the heavy melting low -lead low -lead and low -lead copper alloy. Background technique [0002] With the development of the economy and the improvement of the living standards of the people year by year, countries around the world also pay more and more attention to environmental protection, especially the factors that are more concerned about heavy metals that are more healthy with our health.Lead, as a heavy metal, has always existed in the environment and human pollution and harm. When lead -containing copper alloy will affect human health during production and use, and cause environmental pollution;High, and it is harmful to the human body, so lead -free copper materials are currently the development trend of copper alloy; but the lead combination is conducive to cutting and processing.The old materials of processing cannot be used.Therefore, ...

AI Technical Summary

Problems solved by technology

As a heavy metal, lead has always been polluting and harmful to the environment and the human body. When lead-containing copper alloys will affect human health and cause environmental pollution during production and use; bismuth, as a rare element, is relatively expensive. High and harmful to the human body, so lead-free and bismuth-free copper is the current development trend of copper alloys; but the combination of lead and bismuth is beneficial to cutting processing, and the content of bismuth in copper alloys higher than 0.5% will cause stress cracks, and Processed old materials cannot be reused