Cold rolled steel sheets having an improved press formability

Details Cold rolled steel sheets having an improved press formability Cold rolled steel sheets having an improved press formability

1986-12-19

1988-10-04

Zimmerman, John J.

Stock material or miscellaneous articles

All metal or with adjacent metals

Having variation in thickness

428687, 428925, B21D 5300

Patent

active

047755997

ABSTRACT:
A cold rolled steel sheet or plated steel sheet having an improved press formability as well as excellent phosphatability, resistance to galling and spot weldability is produced by controlling a surface roughness pattern of the steel sheet so as to satisfy a center-line average surface roughness of 0.3-2.0 .mu.m and a regularity parameter in at least one direction of not more than 0.25 defining the regularity of surface roughness.

REFERENCES:
patent: 2941544 (1961-07-01), Gotsch et al.
patent: 3619881 (1971-11-01), Bills et al.
patent: 4071657 (1978-01-01), Rault
patent: 4679288 (1987-07-01), Monfort et al.
Cahiers D'Informations Techniques de la Revue de Metallurgie, vol. 80, No. 5, May 1983, pp. 393-401, Paris, Fr. J. Crahay, et al; "Gravure de la Rugosite des Cylindres de Laminoir Par Impulsions Laser".

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