Heat treatment process of multi-alloy wear-resisting steel casting

Abstract

The invention provides a heat treatment process of a multi-alloy wear-resisting steel casting, and relates to the technical field of steel casting production. The process comprises the following stepsthat the steel casting is washed, then flushed by cold water and out into an oven to be dried; the steel casting is put into a pre-heating box to be preheated; the steel casting is put into a carburizing furnace to be subjected to nitrocarburizing for the first time and is subjected to oil cooling to the 320-340 DEG C; the steel casting is put into the carburizing furnace again to be subjected tonitrocarburizing for the second time and is naturally cooled to the room temperature; and the steel casting is put into a calcining furnace to be subjected to heat treatment, and is naturally cooledto obtain the product. The steel casting is subjected to nitrocarburizing twice, twice nitrocarburizing is mutually matched in a rapid pressure relief mode and a slow pressure relief mode separately,nitrogen and carbon better permeate into the steel casting, the prepared steel casting is good in wear resistance, high in hardness and good in corrosion resistance, the permeating layer is stably distributed through the later heat treatment mode, and the performance of the steel casting is effectively improved.

Description

technical field [0001] The invention relates to the technical field of steel casting production, in particular to a heat treatment process for multi-alloy wear-resistant steel castings. Background technique [0002] Steel castings refer to parts made of cast steel, which have similar properties to cast iron, but are stronger than cast iron. Steel castings are widely used in ships and vehicles, construction machinery, engineering machinery, power station equipment, mining machinery and metallurgical equipment, aviation and aerospace equipment, oil wells and chemical equipment and other fields. [0003] Steel castings usually need to be heat treated during the casting process. Although the performance of the treated steel castings is better than before, its wear resistance has been difficult to improve. In this way, due to severe wear during use, its service life Short and expensive to use. Contents of the invention [0004] Aiming at the deficiencies in the prior art, the...

AI Technical Summary

Problems solved by technology

[0003] Steel castings usually need to be heat treated during the casting process. Although the performance of the treated steel castings is better than before, its wear resistance has been difficult to improve. In this way, due to severe wear during use, its service life short, expensive to use