Hot strip rolling plant and method directly combined with contin

Metal working – Method of mechanical manufacture – Combined manufacture including applying or shaping of fluent...

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148541, 164417, B21B 146

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active

056342578

ABSTRACT:
By rolling a slab with a thickness of 80 mm or less in a plant including a continuous casting machine and a hot strip rolling mill directly combined with each other, low-speed rolling can be achieved while suppressing a drop of the strip temperature and the occurrence of scales. After a slab 2 cast by a continuous casting machine 1 and being 80 mm or less thick is heated and descaled, it is rough-rolled into a bar with a thickness of 20 to 60 mm by a roughing mill 7 constructed as a 4H-twin mill. After being heated and descaled again, the bar is finish-rolled by finishing mills 19 to 21, each of which employs small-diameter work rolls having a diameter not larger than 500 mm, into a thin plate with a thickness in the range of 1.6 mm to 15 mm or a thick plate with a thickness in the range of 3 mm to 40 mm. The rolling speed on the delivery side of the finishing mills 19 to 21 is set to be as low as 350 m/minute or less with a result of small production scale, and the plant length is set to be not longer than 100 m with a result of small plant space.

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First Mini Mill with ISP.
Hitachi Review vol. 37, No. 4, (Aug. 1988), pp. 195-202.
"Recent Hot Strip Manufacture Techniques in Japan", (published by Japan Steel Association, Aug. 10, 1987, pp. 6-10, p. 176.
Hitachi Hyoron vol. 70, No. 6, (Jun. 25, 1988, pp. 67-72).
"Ein Jahr Beitriebserfahrung mit der CSP-Anlarge fur Warmbereitband bei Nucor Steel" (Stahl u. Eisen 111 1991) Nr. 1.

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