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
Stats
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Jun 11, 2013
Grant Date -
Sep 30, 2010
app pub date -
Feb 18, 2010
filing date -
Mar 31, 2009
priority date (Note) -
In Force
status (Latency Note)
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Abstract
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.
First Claim
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Family

- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
Patent Owner | Address | |
---|---|---|
KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL LTD ) | KOBE-SHI HYOGO 651-8585 |
International Classification(s)

- 2010 Application Filing Year
- B32B Class
- 4989 Applications Filed
- 2308 Patents Issued To-Date
- 46.27 % Issued To-Date
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Futamura, Yuichi | Kakogawa, JP | 32 | 212 |
# of filed Patents : 32 Total Citations : 212 | |||
Hoshika, Tetsuji | Kakogawa, JP | 6 | 61 |
# of filed Patents : 6 Total Citations : 61 | |||
Matsumoto, Hiroaki | Kakogawa, JP | 75 | 1513 |
# of filed Patents : 75 Total Citations : 1513 | |||
Miura, Masaaki | Kakogawa, JP | 40 | 278 |
# of filed Patents : 40 Total Citations : 278 | |||
Mizuta, Sae | Kakogawa, JP | 6 | 61 |
# of filed Patents : 6 Total Citations : 61 | |||
Ohta, Hiroki | Kakogawa, JP | 15 | 189 |
# of filed Patents : 15 Total Citations : 189 | |||
Utsumi, Yukihiro | Kakogawa, JP | 17 | 199 |
# of filed Patents : 17 Total Citations : 199 |
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Patent Citation Ranking
- 3 Citation Count
- B32B Class
- 7.74 % this patent is cited more than
- 12 Age
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Maintenance Fees
Fee | Large entity fee | small entity fee | micro entity fee | due date |
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Fee | Large entity fee | small entity fee | micro entity fee |
---|---|---|---|
Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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