Aluminium bronze of sand-casting high-pressure pump head

Abstract

The invention provides aluminium bronze of a sand-casting high-pressure pump head, belonging to the technical field of new non-ferrous materials. The aluminium bronze comprises 9-11.5 % of Al, 2.5-5.0 % of Fe, less than or equal to 3.5 % of Mn, 3.0-6.0 % of Ni, 0.05-0.2 % of Sn, 0.01-0.5 % of Cr, 0.5-1.0 % of Zn, 0.015-0.2 %, and the balance being Cu and less than 1 % of usual impurities. The alloy is high in mechanical properties and pressure resistance of castings, and can be used in related fields of high-voltage submersible pump heads.

Description

[0001] FIELD OF THE INVENTION The present invention relates to aluminum bronzes for use as sand cast high pressure pump heads. Background technique [0002] High pressure (pressure 200kg / cm2) used in seawater desalination, oil field and chemical engineering 2 Above) submersible pump pump head material is ZQAl10-4-4 (China), C95500 (USA), GB-CuAl10Ni (EC) and other aluminum bronze alloys. Take iron mold casting or iron mold casting plus forging, and then machined Due to the high aluminum content of the above-mentioned aluminum bronze, the strength is high, but the plasticity is low. That is, it is hard and brittle. This is because the casting structure is a coarse columnar crystal, α+γ 2 Due to the high volume of eutectoid, it is difficult to process (such as forging, etc.) and deform. At the same time, due to the thick wall thickness of the pump head casting (up to 350mm or more), the coarse columnar crystals are easy to form concentrated shrinkage cavities and shrinkage poros...

AI Technical Summary

Problems solved by technology

[0002] High pressure (pressure 200kg / cm2) used in seawater desalination, oil field and chemical engineering 2 Above) submersible pump pump head material is ZQAl10-4-4 (China), C95500 (USA), GB-CuAl10Ni (EC) and other aluminum bronze alloys. Iron mold casting or iron mold casting plus forging, and then machining Due to the high aluminum content of the above-mentioned aluminum bronze, the strength is high, but the plasticity is low. That is, it is hard and brittle. This is because the casting structure is a coarse columnar crystal, α+γ 2 Due to the high volume of eutectoids, it is difficult to process (such as forging, etc.) and deform. At the same time, due to the thick wall thickness of the pump head castings (up to 350mm or more), the thick columnar crystals are easy to form concentrated shrinkage cavities and shrinkage porosity. Low density, unable to withstand high water pressure and leakage, these problems have become the bottleneck of aluminum bronze used in high-pressure submersible pumps.

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