Low-calcium and easy-cutting silicon brass alloy and preparation method thereof

Abstract

The invention discloses a low-calcium and easy-cutting silicon brass alloy and a preparation method thereof. The silicon brass alloy comprises the following components of 73.5 to 78.40 wt% of copper, 3.0 to 3.45 wt% of silicon, 0.001 to 0.15 wt% of calcium, 0.030 to 0.3 wt% of rare-earth elements, 0.015 to 0.95 wt% of other elements, and the balance of zinc and inevitable impurities; the weight total percentage of the copper, the zinc, the silicon, the calcium and the rare-earth elements is larger than 98.90 wt%; the other elements are at least one element selected from aluminum, tin, phosphorus, nickel, bismuth, magnesium and antimony. The preparation method adopts an alloying processing, purifying and refining method of covering and protecting metamorphic slag removals and comprises thesteps of smelting the low-calcium and easy-cutting silicon brass alloy; continuously casting into silicon brass casting ingots at the temperature of 1030 to 1070 DEG C; carrying out hot working at the temperature of 680 to 740 DEG C; and then carrying out cold working with the working rate of 5 to 30%; carrying out intermediate heat treatment at the temperature of 550 to 650 DEG C; and carrying out stress relief annealing at the temperature lower than 370 DEG C to obtain the finished product. The product has the advantages of high tensile strength, excellent heat forming properties, excellentdezincification-resistant property and stress-corrosion-resistant property, extremely excellent health safety property and cutting property, simple and convenient production technology, low cost and easy recycle, and is beneficial to ecological environment protection and human nutrition and health.

Description

technical field [0001] The invention relates to a brass alloy, in particular to a low-calcium free-cutting silicon brass alloy with high tensile strength, excellent cutting performance, thermal forming performance and corrosion resistance and a preparation method thereof. It is especially suitable for manufacturing fields such as civil drinking water engineering and sanitary ware, pipelines, castings, valves, connectors, household appliances, auto parts, hardware decoration, etc. It is a kind of product that is beneficial to human nutrition, health and environmental protection. Recyclable metal materials are high-strength, corrosion-resistant, and easy-cutting brass alloy materials that are urgently needed by drinking water projects in the world. Background technique [0002] For a long time, due to its good cutting performance and hot and cold forming performance, lead brass has been widely used in the field of machining and cutting manufacturing in various industrial secto...

AI Technical Summary

Problems solved by technology

However, since the alloy needs to add <0.02wt% lead to improve the cutting performance, when the user requires lead-free, the alloy is subject to certain restrictions, and the cutting performance is also reduced

[0006] Another example: the patent application number CN200410004293.7 "Lead-Free Copper Alloy and Its Application" developed by Wieland Corporation in Germany, this alloy is also a lead-free free-cutting silicon brass of Cu-Zn-Si series, consisting of the following components: Copper: 70-83wt%, silicon: 1-5wt%, tin: 0.01-2wt%, iron: 0.01-0.3wt% and or cobalt: 0.01-0.3wt%, nickel: 0.01-0.3wt%, manganese: 0.01- 0.3wt%, the balance is zinc and unavoidable impurities; but because the alloy uses Sn, Ni, Mn to control the structure of the alloy, the ability to resist stress cracking, and the content is high, the cost is also high, and the Fe content is > 0.2wt% will affect the corrosion resistance and electroplating performance, the drilling performance of the alloy is not ideal

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