Metal treatment – Compositions – Heat treating
Patent
1988-12-09
1989-11-28
Yee, Deborah
Metal treatment
Compositions
Heat treating
148 12E, 164476, 164477, B22D 2506
Patent
active
048835447
ABSTRACT:
In a continuously cast piece of austenitic stainless steel having a large amount of Mo, segregation of alloy elements such as Mo and Cr is caused at the center part in the thickness direction of the slab, and the .sigma.-phase is precipitated during the step of cooling the cast piece. When a heavy plate or hot coil is prepared from this cast piece as the starting material, cracking occurs in the hot-working step and the corrosion resistance of the final product is degraded. According to the present invention, at the cast piece-forming step, the super-heating degree of the molten steel is controlled to at least 25.degree. C., whereby the equiaxed zone ratio is controlled to below 25%. When the heating times at the soaking and hot rolling treatments and the conditions for annealing the obtained steel sheet are controlled, the pitting resistance of the steel plate is greatly improved and cracking is prevented at the hot-working step.
REFERENCES:
patent: 4043838 (1977-08-01), Deverell
patent: 4494998 (1985-01-01), Ueda et al.
Patent Abstracts of Japan, vol. 12, No. 83 (M-677)[2930], 16th Mar. 1988; Japan-A-62 224 462 (Nippon Kokan K.K.) 2-10-87.
Patent Abstracts of Japan, vol. 6, No. 242 (M-175)[1120], 30th Nov. 1982; Japan-A-57 139 455 (Kawasaki Seitetsu K.K.), 8-28-82.
Continuous Casting, vol. 2, 1984, pp. 169-193, I.S.S. of AIME, Warrendale, US.; J. E. Lait et al., "Solidification During Continuous Casting of Steel."
Hot Workability of Austenitic Stainless Steels Containing Delta Ferrite, Authors: Tatsuo Kawasaki; Isao Takada; Hiroshi Ohtsubo and Shigeharu Suzuki.
Manufacturing Process and Properties of Stainless Steels Developed by Kawasaki Steel, Authors: Yutaka Ono and Hiroyuki Kaito.
Abe Masayuki
Kurosawa Fumio
Shitani Kensai
Ueda Masanori
Yamamoto Hiroki
Nippon Steel Corporation
Yee Deborah
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