Method of manufacturing high carbon cold-rolled steel sheet

Details Method of manufacturing high carbon cold-rolled steel sheet Method of manufacturing high carbon cold-rolled steel sheet

2006-06-19

2011-11-08

Le, Emily (Department: 1734)

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

C148S330000, C148S333000, C148S336000, C148S337000

Reexamination Certificate

active

08052812

ABSTRACT:
A high carbon cold-rolled steel sheet having both excellent stretch-flange formability and excellent homogeneity of hardness in the sheet thickness direction is provided by a manufacturing method having the steps of: hot-rolling a steel containing 0.2 to 0.7% C by mass at finishing temperatures of (Ar3transformation point −20° C.) or above to prepare a hot-rolled sheet; cooling the hot-rolled sheet to temperatures of 650° C. or below at cooling rates from 60° C./s or larger to smaller than 120° C./s; coiling the hot-rolled sheet after cooling at coiling temperatures of 600° C. or below; cold-rolling the coiled hot-rolled sheet at rolling reductions of 30% or more to prepare a cold-rolled sheet; and annealing the cold-rolled sheet at annealing temperatures from 600° C. or larger to Ac1transformation point or lower.

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Machine translation of JP 2003-013144.
U.S. Appl. No. 11/922,250, Confirmation No. 5950.
English-language machine translation of JP 2003-013145.
P. Spiekermann, “Legierungen—Ein Besonders Patentrecht Liches Problem . . . ”,Mitteilungen Der Deutschen Patentawaelte, pp. 178-190 (1993) together with S. Spiekermann, “Alloys—a special problem of patent law” Nonpublished English Translation of Document, pp. 1-20.

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