Critical solid solution and critical multiple heating variable temperature aging composite heat treatment method

Abstract

The invention provides a critical solid solution and critical multiple-heating variable-temperature aging composite heat treatment method. The method comprises a critical solid solution heat treatment process and a critical multiple-heating variable-temperature aging composite heat treatment process. The scheme provided by the invention has technical feasibility, process adaptability, quality reliability, economic rationality and use safety, and can effectively enhance the advantages and avoid the disadvantages of the traditional mainstream heat treatment method of the austenitic stainless steel; the problems that existing austenitic stainless steel heat treatment is poor in quality stability, low in qualified rate, low in hardness, low in mechanical property, poor in consistency, poor in discoloration and corrosion resistance, long in heating time, low in efficiency, low in cost and the like are fundamentally solved. And the method is particularly suitable for the technical field of hot working engineering such as smelting, steel rolling, forging and heat treatment related to austenitic stainless steel in steel mills and manufacturers.

Description

technical field [0001] The invention relates to the technical field of material heat treatment, in particular to a composite heat treatment method of critical solid solution and critical multiple temperature rises, variable temperature and aging. Background technique [0002] The heat treatment principles of austenitic stainless steel (see GB / T1220, GB / T1221, GB / T12773, etc.) Transformation (good heat treatment process), therefore, alloy structural steel is very easy to greatly improve hardness (or mechanical properties) through quenching and tempering heat treatment methods; while austenitic stainless steel cannot undergo high-temperature austenite transformation under high temperature conditions ( Therefore, it is extremely difficult for austenitic stainless steel to greatly improve the hardness (or mechanical properties) through heat treatment methods such as solid solution and aging. [0003] The meaning of solid solution heat treatment is: heat the austenitic stainless...

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Problems solved by technology

[0017] The technical problem to be solved by the present invention is to provide a composite heat treatment method of critical solid solution and critical multiple temperature rises, variable temperature and aging, which fundamentally solves the problems of poor quality stability, low qualified product rate, low hardness, Low mechanical properties and poor consistency, poor resistance to discoloration and corrosion, long heating time, low efficiency, poor heating reliability of heat treatment equipment, low service life of high-temperature components and high cost" and other unique heat treatment technologies of "one long, one high, four differences and five lows" problem

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