High-strength steel plate having excellent formability, toughness and weldability, and production method of same

A high-strength steel plate and manufacturing method technology, applied in the direction of manufacturing tools, metal rolling, furnaces, etc., can solve the problems of reduced formability and difficulty in processing, and achieve the effect of excellent toughness and weldability
CN113166865AActive Publication Date: 2021-07-23NIPPON STEEL CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NIPPON STEEL CORP
Publication Date
2021-07-23

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Abstract

The invention provides a high-strength steel plate which has excellent formability, toughness and weldability, and is characterized in that the component composition has, in mass%, C: 0.05-0.30%, Si: 2.50% or less, Mn: 0.50-3.50%, P: 0.100% or less, S: 0.0100% or less, Al: 0.001-2.500%, N: 0.0150% or less, and O: 0.0050% or less, the remainder being Fe and unavoidable impurities, wherein the microstructure of the region from 1 / 8t (t: plate thickness) to 3 / 8t (t: plate thickness) from the surface of the steel plate contains, in vol%, at least 20% acicular ferrite and at least 10% martensite (4), and is limited to no more than 20% globular ferrite and no more than 2.0% retained austenite, and the martensite satisfies expression (A).
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Description

technical field

[0001] The present invention relates to a high-strength steel sheet excellent in formability, toughness, and weldability, and a method for producing the same. Background technique

[0002] In recent years, in automobiles, high-strength steel sheets are widely used in order to reduce the weight of the vehicle body to improve fuel efficiency and reduce carbon dioxide emissions, and to absorb collision energy in the event of a collision to ensure the protection and safety of passengers. However, in general, if the strength of the steel plate is increased, the formability (ductility, hole expandability, etc.) will decrease, and it will become difficult to process into complicated shapes. Therefore, strength and formability (ductility, hole expandability, etc.) The balance is not simple, and various techniques have been proposed so far.

[0003] For example, Patent Document 1 discloses a technology in which, in a high-strength steel sheet having a tensile strengt...

Claims

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