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Process for producing cold-rolled strips and sheets of austenitic stainless steel
| Details |
Inventors: Suehiro, Toshiyuki; Sumitomo, Hidehiko; Ueda, Masanori; Ogawa, Shigeru;
Assignee: Nippon Steel Corporation (Tokyo, JP)
Primary Examiner: Seidel; Richard K.
Assistant Examiner:
Attorney, Agent or Firm: Kenyon & Kenyon
Disclosed is a process for the producing coldrolled strips and sheets of austenitic stainless steel, which comprises preparing a cast strip having a thickness not larger than 10 mm, which is composed of an austenitic stainless steel, by a continuous casting machine, in which the wall surface of a casting mold moves synchronously with the cast strip, and cold rolling the cast strip by a hard rolls having a surface hardness not lower than the Vickers hardness of 600. A preferred embodiment of the present invention is characterized in that crystal grains of the cast strip are made finer by cooling the cast strip at a cooling rate of at least 50.degree. C./sec in the temperature range of from the temperature for initiation of solidification of the cast strip to 1200.degree. C. and the cast strip is then coldrolled by the hard rolls, another preferred embodiment of the present invention is characterized in that the hard rolls are composed of a material having a Young's modulus of at least 30000 kgf/mm.sup.2 and the cast strip is cold-rolled by such hard rolls, and another preferred embodiment of the present invention is characterized in that for cast strip which is descaled by pickling, especially with nitric and fluoric acid, prior to cold rolling, the cast strip is cooled at a cooling rate of at least 10.degree. C./sec in the Cr carbide-precipitating temperature range of from 900.degree. to 550.degree. C. |
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DETAILED DESCRIPTION The inventors took note of austenitic stainless steels in which no problem arose with respect to the surface state of the product in the conventional process, and a melt of SUS 304, which is a typical example of austenitic stainless steel, was cast into a strip having a thickness of 1 to 5 mm by a twin-roll continuous casting machine of the internal water-cooling system, the cast strip was cold-rolled, a part of the cold-rolled strip was annealed and pickled to obtain 2B (dull finish) product, and another part of the cold-rolled strip was bright-annealed to obtain BA (bright finish) product.
Furthermore, a continuously cast slab having a thickness of 100 mm or more was hot-rolled and cold-rolled, and 2B and BA products were prepared.
When the surface states of these products were examined and compared in detail it was found surface defects, in the products obtained by using the twin-roll continuous casting machine, fine crepe-like undulations hereinafter referred to as ("roping") peculiarly generated through this process, and uneven gloss, were observed.
The present invention relates to a process for producing an austenitic stainless steel strips and sheets by cold-rolling a cast strip having a thickness close to the thickness of a product, which is cast by a synchronous continuous casting process in which there is no difference in the relative speed of the cast strip and the inner wall surface of a casting mold, and an object of the present invention is to provide a simple process capable of providing a product in which above-mentioned surface defects, such as roping and uneven gloss, do not appear.
More specifically, in accordance with the present invention, the above-mentioned object can be attained by a process for producing cold-rolled strips and sheets of austenitic stainless steel, which comprises preparing a cast strip having a thickness not larger than 10 mm, which is composed of an austenitic stainless steel, by a continuous casting machine, in which the wall surface of a casting mold moves synchronously with the cast strip, and cold rolling the cast strip by hard rolls having a surface hardness not lower than the Vickers hardness of 600
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