PRODUCTION OF THICK STEEL PLATE HAVING SMALLER QUALITY DIFFERENCE IN THICKNESS DIRECTION

Title:

PRODUCTION OF THICK STEEL PLATE HAVING SMALLER QUALITY DIFFERENCE IN THICKNESS DIRECTION

Document Type and Number:

Japanese Patent JPS6320410

Kind Code:

A

Abstract:

PURPOSE: To efficiently produce a high-toughness high-tensile thick steel plate having the material uniformity in the thickness direction by subjecting the thick steel plate to accelerated cooling under such water spraying conditions under which the water flow rate is gradually increased in density.

CONSTITUTION: The accelerated cooling of the thick steel plate after hot rolling is executed by starting the cooling at 0.05W0.5m3/min.m2 water flow rate density, then increasing the water spraying rate gradually until the water flow rate density attains 0.3W1.5m3/min.m2 to decrease the difference in the cooling rate at the time of passing the Ar3 transformation point on the surface and in the inside of the thick steel plate, by which the quality difference in the thickness direction is decreased.

More Like This:

JP2003039109	DEVICE FOR CONTROLLING COIL WINDING TEMPERATURE
JPH10332269	MUFFLE FOR HEAT TREATMENT
WO/1991/009980	PRODUCTION OF ANTICORROSIVE AND ANTIWEARING ALLOY

Inventors:

HAYAKAWA HATSUO
NAKADA TAKAHARU
HIGUCHI KOICHI

Application Number:

JP16645686A

Publication Date:

January 28, 1988

Filing Date:

July 15, 1986

Export Citation:

Click for automatic bibliography generation Help

Assignee:

KOBE STEEL LTD

International Classes:

C21D1/00; (IPC1-7): C21D1/00

Domestic Patent References:

JPS58120725A

1983-07-18

Attorney, Agent or Firm:

Maruhisa Yoshihisa

Previous Patent: Contents acquisition sauce selection and management

Next Patent: BARREL POLISHING METHOD