Lead-free copper alloy with limited Al and preparation method thereof

Abstract

The invention discloses lead-free copper alloy with limited Al and a preparation method thereof. The lead-free copper alloy contains the following chemical components in percentage by weight: 60-65 percent of Cu, Sn being less than 0.0057 percent, Pb being less than 0.100-0.150 percent, 0.012 percent of Ni, 0.032 percent of Mn, 0.122-0.200 percent of Fe, 2-3 percent of Al, 0.018 percent of Si, 0.002 percent of P, S being less than 0.001 percent, 0.014 percent of Sb, 0.005 percent of As, 0.001 percent of Bi, Cr being less than 0.001, Cd being less than 0.0001 and the balance of Zn. The preparation method comprises the following steps: selecting industrial lead-free copper or a raw copper bar or copper scales with copper content being more than 62 percent as master alloy; preheating a masteralloy ingot to 1,100 DEG C until to be molten; adding required trace elements and slightly stirring and heating the trace elements and the molten alloy ingot to 1,200 DEG C; standing still an obtained mixture for half an hour and then dropping the temperature of the mixture to 1,000 DEG C; and carrying out pressure casting. Cutting, stretching and yield coefficients of an obtained pressure casting piece can all be effectively improved; and the pressure casting piece can meet the requirements of casting and machining.

Description

technical field [0001] The invention belongs to a lead-free copper alloy containing limited amount of Al and a preparation method thereof. Background technique [0002] At present, copper is widely used in various industries, especially the drinking water industry and power industry, such as sanitary equipment, drinking water equipment and environmental protection, due to its excellent cutting and tensile properties. Here, for drinking water equipment, for the sake of safety and health, it must be required to use lead-free copper or lead-free copper alloy, that is, the content of Pb (lead) element in copper or copper alloy must be less than the specified standard (lead is The element added by the manufacturer to achieve excellent cutting performance), this hard requirement has resulted in a wide variety of lead-free copper on the market, but only 1-2 specifications with a copper content between 60-65%, and because of the Pb content The reduction of the material makes it uns...

AI Technical Summary

Problems solved by technology

Here, for drinking water equipment, for the sake of safety and health, it must be required to use lead-free copper or lead-free copper alloy, that is, the content of Pb (lead) element in copper or copper alloy must be less than the specified standard (lead is The element added by the manufacturer to achieve excellent cutting performance), this hard requirement has resulted in a wide variety of lead-free copper on the market, but only 1-2 specifications with a copper content between 60-65%, and because of the Pb content The reduction of the material makes it unsuitable for casting and machining, and its cutting, stretching, yielding and other coefficients need to be further improved to meet market demand.

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