New multicomponent heterogeneous copper alloy for valve plate casting

Abstract

The invention relates to a new multicomponent heterogeneous copper alloy for valve plate casting. The alloy comprises the following chemical compositions by weight percent: 10-12.5% of Al, wherein the content of Al is controlled below 10.3; 2.0-5.0% of Fe, 0.1-0.5% of Mn; 0.1-1.5% of Ni; more than one of 0.1-0.8% of Ti; 0.005-0.03% of B and 0.5-1.5% of Zn and the balance Cu. The alloy of the invention contains multicomponent duplex structure and fine equiaxed grains, has high mechanical property, such as impact toughness, good chemical stability, high compactness and low material cost and is widely used in the valve plate casting material. The invention provides one copper alloy which comprises the following chemical compositions by weight percent: 10-12.5% of Al, 3.0-5.0% of Fe, 0.2-0.5% of Mn, 1.5% or less of Ni, 0.01-0.02% of B, 0.8-1.2% of Zn and the balance Cu; another copper alloy is also provided which comprises the following chemical compositions by weight percent 10-12.5% of Al, 3.0-5.0% of Fe, 0.2-0.5% of Mn, 1.5% or less of Ni, 0.3-0.5% of Ti, 1.0-1.5% of Zn and the balance Cu.

Description

technical field [0001] The invention is a cast copper alloy material for a valve plate. . Background technique [0002] The valve plate is one of the main parts of the valve, which directly bears the pressure and corrosion of the medium. The materials used must meet the requirements of "valve pressure and temperature rating". Copper alloy is suitable for water, seawater, oxygen, oil and other media with PN≤2.5Mpa, as well as steam media with a temperature of -40~250℃. [0003] At present, the commonly used copper alloy grades are ZGSn 10 Zn 2 (tin bronze), H62, HPb59-1 (brass), QZAl9-2, QZAl9-4 (aluminum bronze). Tin bronze is not suitable for pressure valve parts due to its high Sn content, high material cost, and high loose tendency. Brass has poor corrosion resistance in flowing seawater, steam and other media. The casting structure of the existing aluminum bronze grades is a coarse columnar crystal with poor compactness. In addition, because the Al% is less than 9.4...

AI Technical Summary

Problems solved by technology

Tin bronze is not suitable for pressure valve parts due to its high Sn content, high material cost, and high loose tendency.

Brass has poor corrosion resistance in flowing seawater, steam and other media. The casting structure of the existing aluminum bronze grades is a coarse columnar crystal with poor compactness. In addition, because the Al% is less than 9.4%, its structure is a single-phase α Solid solution, low strength and hardness, poor wear resistance, so its mechanical properties and water pressure resistance cannot meet the design requirements of large valve valve plates

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