Title:
METHOD OF MANUFACTURING HOT ROLLED STEEL PLATE EXCELLENT IN LONGITUDINAL CRACK RESISTANCE
Document Type and Number:
Japanese Patent JP3855556
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method of manufacturing a hot rolled steel plate excel lent in longitudinal crack resistance, and particularly a thick hot rolled steel plate of ≥4 mm plate thickness.
SOLUTION: At hot finish rolling of a slab of a steel having a composition containing, by weight, 0.001-0.03% C, 0-0.5% Si, 0-2% Mn, ≤0.02% P, ≤0.02% S, ≤0.1% sol. Al and ≤0.005% N, rolling is performed under the conditions of: ≤95% total finish rolling rate; ≥55% total draft at ≥2 (Ar3 transformation point + 70°C); and finish rolling temperature between the Ar3 transformation point and (Ar3 transformation point + 40°C).
Inventors:
Yasuhiro Matsuki
Kunikazu Tomita
Takato Keiji
Tetsuo Yamamoto
Kunikazu Tomita
Takato Keiji
Tetsuo Yamamoto
Application Number:
JP26504399A
Publication Date:
December 13, 2006
Filing Date:
September 20, 1999
Export Citation:
Assignee:
jfe Steel Corporation
International Classes:
C21D8/04; C21D9/48; C22C38/00; C22C38/06; C22C38/14; (IPC1-7): C21D9/48; C21D8/04; C22C38/00; C22C38/06; C22C38/14
Domestic Patent References:
| JP9170027A | ||||
| JP62192539A | ||||
| JP60155625A | ||||
| JP10130736A |
Attorney, Agent or Firm:
Yasuo Ishikawa