780mpa low-carbon low-alloy trip steel and its rapid heat treatment method

A rapid heat treatment and low-alloy technology, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve the problems of high manufacturing costs and high equipment requirements, and achieve the effects of reducing production costs, energy consumption, and time
CN109943769BActive Publication Date: 2021-06-15BAOSHAN IRON & STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BAOSHAN IRON & STEEL CO LTD
Publication Date
2021-06-15

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Abstract

780MPa low-carbon low-alloy TRIP steel and its rapid heat treatment method. The chemical composition of the steel is: C 0.16-0.22%, Si 1.2-1.6%, Mn 1.6-2.2%, and the balance is Fe and other unavoidable impurities. Its heat treatment steps include rapid heating-short-time heat preservation-rapid cooling. In the present invention, by controlling the recrystallization and phase transformation process during heating and the phase transformation process during cooling, a three-phase structure in which bainite and austenite are uniformly distributed on the ferrite matrix is ​​finally obtained, bainite and austenite The average grain size of the body is 1-3μm; the bainite is submicron granular; the austenite is island-shaped and evenly distributed equiaxed grains; the volume fraction of bainite in the three-phase structure is generally 35-75%, and the iron The volume fraction of the element body is 10-60%, and the volume fraction of the austenite is 5-15%. The rapid heat treatment improves the mechanical properties of the material while improving the heat treatment efficiency, and expands the range of material properties.
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Description

technical field

[0001] The invention belongs to the technical field of rapid heat treatment of materials, and in particular relates to a 780MPa low-carbon low-alloy TRIP steel and a rapid heat treatment method thereof. Background technique

[0002] With the gradual improvement of people's awareness of energy conservation and material safety in service, the use of high-strength steel, especially advanced high-strength steel, is increasing. This also makes iron and steel enterprises and scientific research institutes pay more and more attention to the development of advanced high-strength steel. In order to further improve the strength-plastic product of steel products, the development of advanced high-strength steel represented by TRIP (phase transformation induced plastic deformation) steel has been paid more and more attention. The cold rolling heat treatment process of cold rolled TRIP steel consists of two stages of austenitizing annealing and bainite isothermal treatmen...

Claims

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