Title:
MANUFACTURE OF EXTREMELY THICK WIDE-FLANGE STEEL EXCELLENT IN STRENGTH, TOUGHNESS AND WELDABILITY
Document Type and Number:
Japanese Patent JP3410241
Kind Code:
B2
Abstract:
PURPOSE: To obtain an extremely thick wide-flange steel excellent in strength, toughness and weldability by hot-rolling a slab whose chemical composition and C-equivalent are specified into the side-flange steel under specified conditions and, further, executing air cooling after light reduction.
CONSTITUTION: A steel base stock which consists of, by weight, 0.05-0.15% C, ≤0.10% Si, 1.00-1.80% Mn, 0.005-0.050% Al, 0.0020-0.0070% N, 0.005-0.040% Nb, further, one or more kinds of 0.005-0.020% Ti, 0.05-0.60% Cu, 0.05-0.60% Ni, 0.05-0.50% Cr, 0.02-0.30% Mo, 0.0010-0.0020% REM, 0.0002-0.0030% B, 0.0010-0.0100% Ca, 0.005-0.080% V and the balance Fe and whose C-equivalent which is expressed by the equation is ≤40% is used. This slab is heated to 1200-1350°C and hot-rolled into the wide-flange steel whose flanges are ≥40mm thick. Further, light reduction of ≤3%/pass is added at ≤900°C and hot working of ≥20% in cumulative draft is executed. Next, wide-flange steel is air-cooled to the room temp.
Inventors:
Kiyoshi Uchida
Akihiro Matsuzaki
Kenichi Amano
Akihiro Matsuzaki
Kenichi Amano
Application Number:
JP822295A
Publication Date:
May 26, 2003
Filing Date:
January 23, 1995
Export Citation:
Assignee:
Kawasaki Steel Co., Ltd.
International Classes:
B21B3/00; B21B1/08; B21B1/088; C21D8/00; C21D9/00; C22C38/00; C22C38/54; C22C38/58; (IPC1-7): B21B1/08; B21B3/00; C21D8/00; C21D9/00; C22C38/00; C22C38/54; C22C38/58
Domestic Patent References:
| JP5343663A | ||||
| JP6228634A | ||||
| JP5345915A | ||||
| JP657327A | ||||
| JP5263182A | ||||
| JP5132716A | ||||
| JP4617420B1 |
Attorney, Agent or Firm:
Yoshio Kosugi (2 outside)