Vacuole corrosion resistant hardening casting

Abstract

A kind of sclerotic casting, which can bear vacuole corrode, the components and their weight percent are as following: Carbon: 0.02-0.10; Silicon: 0.1-1.5; Manganese: 0.5-2.5; Chromium: 11.0-15.0; Nickel: 5.5-8.5; Molybdenum: 1.5-3.0; Copper: 1.5-3.5; Niobium: 0.2-0.4; the other is iron. The zero gravity index at strong corrode of the sclerotic casting, which can bear vacuole corrode, and made according to this patent, such as airscrew, sea water pump and lamina of impeller, is only 1.0mg/2h. They own excellent sea decay resistance ability and vacuole decay resistance ability is high in sea, the intensity of them is high and tenacity is well. They can fulfil the demands of large mainframe and large ship airscrew, and it also can fulfil the need of war industry.

Description

technical field [0001] The invention relates to a casting, in particular to a cavitation corrosion hardening casting, which belongs to the field of metallurgy. Background technique [0002] Seawater pump impellers and propellers widely used in coastal power stations and ships are mostly made of copper materials. The biggest problem with copper propellers and seawater pump impellers is their poor resistance to cavitation corrosion and impact corrosion, and they are often replaced. Although domestic propeller and seawater pump impeller materials are constantly updated, from manganese brass to nickel-aluminum bronze, high-manganese-aluminum bronze, beryllium-cobalt-aluminum bronze, cavitation corrosion resistance is continuously improved, but the increase is not large, and the cumulative life of high-speed propellers Only 200-300 hours; the high-speed propellers of Chinese ships are also mainly made of copper casting materials such as high-manganese aluminum bronze, which have ...

AI Technical Summary

Problems solved by technology

The stainless steel has good mechanical properties, fatigue resistance and corrosion resistance. The artificial seawater cavitation test shows that its cavitation corrosion weight loss index is 15g / m 2 h, but it still cannot meet the requirements of large main engine power and large ship propellers, or it still needs to be replaced frequently, which cannot meet the needs of long-term use, especially the needs of military industry

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