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US Patent 11466337 High-strength steel sheet and method for producing same

Patent 11466337 was granted and assigned to Kobe Steel on October, 2022 by the United States Patent and Trademark Office.

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Is a
Patent
Patent
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Patent attributes

Patent Applicant
Kobe Steel
Kobe Steel
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Current Assignee
Kobe Steel
Kobe Steel
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Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
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Patent Number
114663370
Patent Inventor Names
Toshio Murakami0
Tadao Murata0
Kenji Saito0
Hirokazu Natsumeda0
Date of Patent
October 11, 2022
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Patent Application Number
166177360
Date Filed
May 22, 2018
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Patent Primary Examiner
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Seth Dumbris
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CPC Code
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C21D 8/0236
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C21D 8/0263
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C21D 9/46
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C21D 9/48
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C21D 2211/001
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C21D 2211/002
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C21D 2211/005
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C21D 2211/008
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...

Disclosed is a high-strength sheet containing: C: 0.15% by mass to 0.35% by mass, a total of Si and Al: 0.5% by mass to 3.0% by mass, Al: 0.01% by mass or more, N: 0.01% by mass or less, Mn: 1.0% by mass to 4.0% by mass, P: 0.05% by mass or less, and S: 0.01% by mass or less, with the balance being Fe and inevitable impurities, wherein the steel structure satisfies that: a ferrite fraction is 5% or less, the total fraction of tempered martensite and tempered bainite is 60% or more, the amount of retained austenite is 10% or more, MA has an average size of 1.0 μm or less, retained austenite has an average size of 1.0 μm or less, retained austenite having a size of 1.5 μm or more accounts for 2% or more of the total amount of retained austenite, and the amount of solute nitrogen in a steel sheet is 0.002% by mass or less.

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