Process for making coated cold-rolled dual phase steel sheet

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United States of America Patent

PATENT NO 9790567
APP PUB NO 20140141279A1
SERIAL NO

14084942

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Abstract

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A coated dual-phase steel and process for producing the coated dual-phase steel is provided. The process includes providing a steel slab with a desired chemistry, soaking the slab at an elevated temperature and then hot rolling the slab to produce hot-rolled strip. The hot-rolled strip is coiled and has a ferrite-pearlite microstructure. The coiled hot-rolled strip is cold-rolled into cold-rolled sheet with at least a 60% reduction in thickness compared to the thickness of the coiled hot-rolled strip. The cold-rolled sheet is subjected to an intercritical anneal followed by rapid cooling with the absence of an isothermal heat treatment or hold after rapid cooling near the molten metal pot temperature—during which, before or after which the steel is coated. The coated steel sheet has a dual-phase ferrite-martensite microstructure, a yield strength of at least 310 MPa, a tensile strength of at least 580 MPa and a total elongation to failure of at least 18%.

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Patent Owner(s)

Patent OwnerAddress
THYSSENKRUPP STEEL USA LLC1 THYSSENKRUPP DRIVE CALVERT AL 36513

International Classification(s)

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  • 2013 Application Filing Year
  • C21D Class
  • 530 Applications Filed
  • 450 Patents Issued To-Date
  • 84.91 % Issued To-Date
Click to zoom InYear of Issuance% of Matters IssuedCumulative IssuancesYearly Issuances20132014201520162017201820192020202120220255075100

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Bevans, Stanley Wayne S.W. Decatur, US 11 12
Boggs, Roger Dale Columbus, US 5 9
Ehrhardt, Bertram Wilhelm Mobile, US 13 14
Frimpong, Joseph Saraland, US 7 10
Jamwal, Ranbir Mobile, US 2 0
Van, Bracht Harald Theodore, US 5 10

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  • C21D Class
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Citation count rangeNumber of patents cited in rangeNumber of patents cited in various citation count ranges7894201 - 1011 - 2005101520253035404550556065707580859095100

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