Title:
HOT ROLLED STEEL PLATE FREE FROM CRACK AND SURFACE FLAW AND ITS PRODUCTION
Document Type and Number:
Japanese Patent JP3180575
Kind Code:
B2
Abstract:
PURPOSE: To prevent the occurrence of cracks in a cast slab at the time of continuously casting a steel containing tramp elements in a steel composition, to improve the hot workability of the slab, and to produce a hot rolled steel plate free from surface flaw and excellent in quality.
CONSTITUTION: This hot rolled steel plate has a composition consisting of 0.01-0.15% C, ≤0.3% Si, 0.1-1.0% Mn, ≤0.03% P, ≤0.025% S, 0.01-0.07% sol.Al, ≤0.012% N, 0.04-0.4% Cu, 0.004-0.04% Sn, 0.01-0.1% Ni, 0.01-0.1% Cr, 0.01-0.1% Mo, and Fe, satisfying C+(Cu+5Sn)/3≤0.25% in the stage of a molten steel, and also satisfying Cu+10Sn≤0.4% in the stage of a slab. A steel having this composition is refined and cast into a slab by continuous casting. The cast slab is heated to ≥1100°C, and both edges of the heated slab, in a plate-width direction, are heated by means of edge heaters. Then, the slab is hot-rolled at a finishing temp. not lower than the Ar3 transformation point and coiled at 500-700°C. By this method, the hot rolled steel plate free from crack and surface flaw can be produced.
Inventors:
Moriaki Ono
Koichi Ohsawa
Koichi Ohsawa
Application Number:
JP23402094A
Publication Date:
June 25, 2001
Filing Date:
September 02, 1994
Export Citation:
Assignee:
Nippon Steel Tube Co., Ltd.
International Classes:
B21B3/00; B21B45/00; C21D8/02; C22C38/00; C22C38/44; (IPC1-7): C22C38/00; C21D8/02; C22C38/44
Domestic Patent References:
| JP7157844A | ||||
| JP5185185A | ||||
| JP5179395A | ||||
| JP5156357A |
Attorney, Agent or Firm:
Yasuo Ishikawa