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

A rapid heat treatment and hot-dip galvanizing technology, applied in heat treatment furnaces, heat treatment equipment, hot-dip plating processes, etc., can solve problems such as the increase in the cost of precious metals, and achieve the effects of superior performance, increased elongation, and increased tensile strength.
CN109943770BActive 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 level low-carbon low-alloy hot-dip galvanized 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 unavoidable impurities. The invention finally obtains a three-phase structure in which bainite and austenite are evenly distributed on the ferrite matrix by controlling the recrystallization and phase transformation process during heating and the phase transformation process during cooling. Among them, the average grain size of bainite and austenite is 1-3 μm; bainite is submicron granular; austenite is island-shaped and evenly distributed equiaxed grains; overall, the volume of bainite in the three-phase structure The fraction is 35%-75%, the volume fraction of ferrite is 10%-60%, and the volume fraction of austenite is 5%-15%. Rapid heat treatment improves the mechanical properties of the material while improving the heat treatment efficiency, and expands the material properties Interval range.
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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 hot-dip galvanized 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 ...

Claims

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