Steel plate and manufacturing method thereof

A steel plate, high-quality technology, applied to the steel plate with high Mn concentration and its manufacturing field, can solve the problems of poor uniform tensile properties, high Mn concentration, and inability to have both tensile strength and formability
CN110177896BActive Publication Date: 2021-09-14NIPPON STEEL CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NIPPON STEEL CORP
Publication Date
2021-09-14

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Abstract

The present invention provides a high Mn-containing steel sheet having excellent uniform tensile properties and high strength. The steel sheet is characterized by containing C: more than 0.10% to less than 0.55%, Si: more than 0.001% to less than 3.50%, Mn: more than 4.00% to less than 9.00%, and sol.Al: more than 0.001% in mass % And less than 3.00%, the rest is composed of iron and unavoidable impurities, wherein, in the L section, the metal structure at the position of 1 / 4 of the thickness from the surface contains 25% to 90% of tempering in terms of area % Martensite, less than 3% ferrite, 10% to 75% retained austenite and less than 5% bainite.
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Description

technical field

[0001] The present application relates to a steel sheet having excellent formability and a manufacturing method thereof, and more specifically to a steel sheet having a high Mn concentration having excellent uniform tensile properties and high strength and a manufacturing method thereof. Background technique

[0002] In order to achieve both weight reduction and safety of automobile bodies and components, the strength of steel sheets, which are their raw materials, has been increasing. In general, when the strength of a steel sheet is increased, the elongation decreases and the formability of the steel sheet is impaired. Therefore, in order to use a high-strength steel sheet as a member for automobiles, it is necessary to improve both strength and formability, which are opposite characteristics.

[0003] In order to increase the elongation, so-called TRIP steels utilizing the transformation plasticity of retained austenite (retained γ) have been proposed (fo...

Claims

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