PROCESS FOR MANUFACTURE OF COLD-ROLLED HIGH-CARBON STEEL PLATE

Title:

PROCESS FOR MANUFACTURE OF COLD-ROLLED HIGH-CARBON STEEL PLATE

Document Type and Number:

WIPO Patent Application WO/2007/000954

Kind Code:

A1

Abstract:

A process for manufacture of a cold-rolled high-carbon steel plate comprising the steps of: hot-rolling a steel containing 0.2 to 0.7% by mass of C at a finishing temperature lower by 20°C than a Ar3 transformation point or higher to produce a heat-rolled plate; cooling the heat-rolled plate to a temperature of 650°C or lower at a cooling rate of 60°C/sec or higher and lower than 120°C/sec; taking-up the cooled hot-rolled plate at a take-up temperature of 600°C or lower; cold-rolling the resulting hot-rolled plate at a pressure reduction rate of 30% or more to produce a cold-rolled plate; and annealing the cold-rolled plate at an annealing temperature ranging from 600°C and an Ac1 transformation point inclusive. The process can produce a cold-rolled high-carbon steel plate which is excellent in stretch-flange formalibity and evenness in hardness in the thickness-wise direction.

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Inventors:

KARIYA NOBUSUKE (JP)
KANAMOTO NORIO (JP)
OOKUBO HIDEKAZU (JP)
KUSUMOTO YOSHIHARU (JP)
FUJITA TAKESHI (JP)

Application Number:

PCT/JP2006/312669

Publication Date:

January 04, 2007

Filing Date:

June 19, 2006

Export Citation:

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Assignee:

JFE STEEL CORP (JP)
KARIYA NOBUSUKE (JP)
KANAMOTO NORIO (JP)
OOKUBO HIDEKAZU (JP)
KUSUMOTO YOSHIHARU (JP)
FUJITA TAKESHI (JP)

International Classes:

C21D9/46; C22C38/00; C22C38/58

Foreign References:

JP2003013144A	2003-01-15
JP2003089846A	2003-03-28
JP2004137554A	2004-05-13
JPH06271935A	1994-09-27
JPH05195056A	1993-08-03

Other References: