Environment-friendly manganese brass alloy and manufacturing method thereof

Abstract

The invention provides an environment-friendly manganese brass alloy comprising 55-65 wt% of Cu, 1.0-6.5 wt% of Mn, 0.2-3.0 wt% of Al, 0-3.0 wt% of Fe, 0.3-2.0 wt% of Sn, 0.01-0.3 wt% of Mg, 0-0.3 wt% of Bi and / or 0-0.2 wt% of Pb, and the balance of Zn and other inevitable impurities. The alloy has favorable mechanical property, casting property, cutting property and corrosion resistance, particularly stress corrosion resistance, has the advantages of low manufacturing cost, simple production technology and the like, is suitable for parts processed by forging, casting, machining and other manufacturing methods, and is particularly suitable for a tap body and a valve processed by forging, casting and machining.

Description

technical field [0001] The invention relates to a brass alloy and a manufacturing method thereof, in particular to an environment-friendly manganese brass alloy and a manufacturing method thereof. Background technique [0002] At present, the brass materials commonly used in civil and industrial water supply systems generally contain 1.0-4.0% lead, which will be partially dissolved in water during the water supply process, resulting in excessive lead content in the water (such as US NSF / ANSI 61-2007 drinking water The standard stipulates that the lead content in water should not exceed 5μg / L, and the antimony content should not exceed 0.6μg / L), but in recent years, medical experts around the world have found that lead poses a threat to human health and environmental hygiene. Therefore, extensive research has been carried out at home and abroad. In the research of replacing lead brass, three alloy systems are basically used: Cu-Zn-Bi system, Cu-Zn-Si system and Cu-Zn-Sb syste...

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Problems solved by technology

[0005] Chinese patent ZL200410015836.5 discloses a lead-free free-cutting antimony brass alloy, which is a copper-zinc-antimony alloy. Since the alloy contains antimony, although the cutting performance and corrosion resistance can be improved, the cold workability of the alloy Unsatisfactory, affecting the subsequent processing properties of the alloy

[0006] Chinese patent ZL200710066669.0 discloses a high-manganese free-cutting copper-zinc alloy, and Chinese patent ZL 200710066947.2 discloses a free-cutting high-manganese copper alloy. Both of the above two patents use manganese as the main alloying element, and the difference is the manganese content The scope and other alloy elements are also different. As free-cutting high-manganese brass alloys, the two have good application prospects, but their high Pb content will cause the dissolution of Pb elements in water to exceed the standard and cannot be used for drinking. Components of the water supply system

[0007] At present, lead-free or low-lead free-cutting brass, such as high-copper-silicon brass, high-tin-bismuth brass, aluminum brass, antimony brass, etc., valves made by sand casting or stamping, have an assembly torque of 90-137N m, the concentration of ammonia water is 14%, and under the condition of ammonia fumigation for 24 hours, only high-copper-silicon brass and high-tin-bismuth brass exhibit excellent stress corrosion resistance, but the cost of raw materials is high, and the products lack market competitiveness

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