High-nickel austenite nodular cast iron heat treatment oxidation prevention process

Abstract

The invention discloses a high-nickel austenite nodular cast iron heat treatment oxidation prevention process. The heat treatment temperature is 950 to 1200 DEG C. the process is characterized in that firstly, cast iron chips are used for covering the surface of a high-nickel austenite nodular cast iron casting, and then, the high-nickel austenite nodular cast iron casting is sent into a furnace to be subjected to heat treatment. Compared with the traditional oxidation prevention method, the oxidation prevention process provided by the invention has the advantages that a reduction production layer is formed on the surface of the casting by the cast iron chips, the casting is prevented from being oxidized during the high-temperature heat treatment, and the fast cooling requirement of the casing after the heat treatment and furnace discharge can also be met, so higher material performance can be obtained, the heat treatment advantages can be sufficiently realized, the raw materials of the process can be easily obtained, the cost is low, the operation is simple, the requirement on heat treatment equipment is low, and the popularization is very easy.

Description

technical field [0001] The invention belongs to the field of heat treatment of high-nickel austenitic nodular cast iron, and in particular relates to an anti-oxidation process of high-nickel austenitic nodular cast iron during heat treatment. Background technique [0002] As human beings attach importance to environmental protection, the development of automobile technology must adapt to the requirements of human beings for environmental protection. The demand for engines with small displacement and high power has greatly increased. High-strength heat-resistant materials (such as high-nickel austenitic ductile iron) are used in the engine Widely used, and some cast heat-resistant material parts need to carry out necessary heat treatment to improve performance. However, the particularity of the high-nickel austenitic nodular cast iron heat treatment process (quick cooling after heat preservation at 950°C to 1200°C) and large batches and dimensions make it impossible to use ad...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the oxidation problem of high-nickel austenitic nodular cast iron during heat treatment at high temperature (950°C ~ 1200°C), and to provide an anti-oxidation process for heat treatment of high-nickel austenitic nodular cast iron with simple operation and low cost