Heterostructure-based multi-type reinforced austenitic stainless steel and manufacturing method

Abstract

Heterostructure-based multi-type reinforced austenitic stainless steel is characterized by comprising the following chemical components in percentage by mass: less than 0.05% of C, less than 0.50% of Si, less than 1.3% of Mn, 14-16% of Cr, 7-9% of Ni, 1-3% of Mo, less than 1.4% of Cu, less than 0.01% of S, less than 0.02% of P and the balance of Fe and inevitable impurity elements. The martensite transformation temperature of the austenitic stainless steel is more than-60 DEG C and less than 40 DEG C. According to the high-strength austenitic stainless steel, austenite is stabilized by refining grains and increasing dislocation and other defects. Compared with the existing austenitic stainless steel, the heterostructure-based multi-type reinforced austenitic stainless steel needs less alloy content and has better economic efficiency. Through multiple types of strengthening modes (including fine grain strengthening, second phase strengthening, precipitation strengthening, solid solution strengthening and non-uniform deformation strengthening) based on a heterostructure, only a small amount of work hardening capacity is sacrificed, and the austenite can still keep the uniform elongation exceeding 20% while reaching the 125 steel grade (862 MPa).

Description

technical field [0001] The invention belongs to the field of high-strength plastic alloy production, and relates to a multi-type reinforced austenitic stainless steel based on a heterogeneous structure and a manufacturing method. Background technique [0002] Because of its high chemical stability in corrosive environments and good oxidation resistance at high temperatures, stainless steel is widely used in textile industry, paper industry, household appliances, clothing industry, nuclear industry, transportation vehicles, construction Industry, electronics industry, oil refining industry, energy industry, etc. In some environments, it will be subjected to external loads, so stainless steel is required to have a certain strength, such as the axial and circumferential tensile stress brought by the self-weight of the pipe string and the bottom gas pressure in the service environment of oil and gas pipes. Therefore, in these demanding environments, high-strength martensitic st...

AI Technical Summary

Problems solved by technology

Retained austenite has low chemical stability due to the alloy system, and low mechanical stability due to the residual stress in this large amount of retained austenite

Stress-induced martensitic transformation leads to premature yielding of the material and very fast strain-induced martensitic transformation leads to material with lower elongation

Therefore, the stainless steel in this alloy neutral usually has poor mechanical properties

[0005] Using the current design concept of heterogeneous structure, put forward multi-type strengthening, and rationally use this part of the alloy neutral stainless steel to prepare high-strength and tough austenitic stainless steel. At present, there are no relevant reports at home and abroad.

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