Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Patent
1997-01-30
1998-04-14
Ip, Sikyin
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
148643, C22C 3800
Patent
active
057387397
ABSTRACT:
A method for producing a steel section by a rolling process including a rough rolling step, an intermediate rolling step and a finishing rolling step. The intermediate rolling step comprises water-cooling the flange portion of the rough-rolled steel section between rolling passes in the intermediate rolling step to cool the surface layer of the flange to a temperature not higher than 750.degree. C., and rolling the flange portion during recuperation of the surface layer of the flange at least one time between the rolling passes with a total draft not less than 20% and at an average rolling temperature not higher than 950.degree. C. and, after the finishing rolling step the outer surface of the flange is cooled at a cooling rate ranging from 0.5.degree. to 10.degree. C./sec depending on the thickness of the flange. Also the carbon equivalent of the steel is controlled. The advantage is that steel sections of various contours and dimensions can be produced from minimized varieties of steel compositions.
REFERENCES:
Frantz et al., "Advanced Thermomechanical Rolling Technologies for Heavy Beams", Metallurgical Plant and Technology Mar. 1989, pp. 94, 96, 100, 102, 106, page with Figure 12.
Patent Abstracts of Japan, vol. 18, No. 191 (C-1186), Apr. 4, 1994, & JP-A-05 345915 (Nippon Steel Corp.), Dec. 27, 1993, *abstract*.
Patent Abstracts of Japan, vol. 18, No. 151 (M-1576), Mar. 14, 1994, & JP-A-05 329521 (Kawasaki Steel Corp.), Dec. 14, 1993, *abstract*.
Patent Abstracts of Japan, vol. 16, No. 419 (C-981), Sep. 3, 1992, & JP-A-04 143224 (Kawasaki Steel Corp.), May 18, 1992, *abstract*.
Patent Abstracts of Japan, vol. 15, No. 208 (M-1117), May 28, 1991, & JP-A-03 057509 (Nippon Steel Corp.), Mar. 12, 1991, *abstract*.
Patent Abstracts of Japan, vol. 16, No. 342 (C-966), Jul. 24, 1992, & JP-A-04 103720 (Kawasaki Steel Corp.), Apr. 6, 1992, *abstract*.
Patent Abstracts of Japan, vol. 6, No. 224 (M-170), Nov. 9, 1982, & JP-A-57 127501 (Nippon Kokan K.K.), Aug. 7, 1982, *abstract*.
Inagaki Akira
Oda Naoki
Takeshima Yasushi
Yamamoto Kohichi
Ip Sikyin
Nippon Steel Corporation
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