High-strength cold-rolled steel sheet excellent in bending workability

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 8460800
APP PUB NO 20100247957A1
SERIAL NO

12708109

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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Disclosed is a cold-rolled steel sheet having a specific steel composition and having a composite steel structure including a ferrite structure and a martensite-containing second phase. In a surface region of the steel sheet from the surface to a depth one-tenth the gage, the number density of n-ary groups of inclusions determined by specific n-th determinations is 120 or less per 100 cm2 of a rolling plane, in which the distance in steel sheet rolling direction between outermost surfaces of two outermost particles of the group of inclusions is 80 μm or more. Also disclosed is a cold-rolled steel sheet having a specific steel composition and having a steel structure of a martensite single-phase structure. In the surface region, the number density of groups of inclusions, in which the distance between the outermost surfaces is 100 μm or more, is 120 or less per 100 cm2 of a rolling plane.

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Patent Owner(s)

Patent OwnerAddress
KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL LTD )KOBE-SHI HYOGO 651-8585

International Classification(s)

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  • 2010 Application Filing Year
  • B32B Class
  • 4989 Applications Filed
  • 2308 Patents Issued To-Date
  • 46.27 % Issued To-Date
Click to zoom InYear of Issuance% of Matters IssuedCumulative IssuancesYearly Issuances201020112012201320142015201620172018201920202021202220230255075100

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Futamura, Yuichi Kakogawa, JP 32 212
Hoshika, Tetsuji Kakogawa, JP 6 61
Matsumoto, Hiroaki Kakogawa, JP 75 1513
Miura, Masaaki Kakogawa, JP 40 278
Mizuta, Sae Kakogawa, JP 6 61
Ohta, Hiroki Kakogawa, JP 15 189
Utsumi, Yukihiro Kakogawa, JP 17 199

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Patent Citation Ranking

  • 3 Citation Count
  • B32B Class
  • 7.74 % this patent is cited more than
  • 12 Age
Citation count rangeNumber of patents cited in rangeNumber of patents cited in various citation count ranges21116674781817141301212331601 - 1011 - 2021 - 3031 - 4041 - 5051 - 6061 - 7071 - 8081 - 9091 - 100100 +0100200300400500600700800900100011001200130014001500160017001800

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