Process for producing rolled shape steel material having high st

Details Process for producing rolled shape steel material having high st Process for producing rolled shape steel material having high st

1993-09-20

1995-06-06

Dean, Richard O.

Metal treatment

Process of modifying or maintaining internal physical...

With casting or solidifying from melt

148507, 148652, 148653, 148654, C22C 3800

Patent

active

054219205

ABSTRACT:
After a predeoxidation treatment of a molten steel comprising as basic ingredients, in terms of % by weight, 0.04 to 0.20% of C, 0.05 to 0.50% of Si, 0.4 to 2.0% of Mn, 0.3 to 0.7% of Mo, 0.003 to 0.015% of N, 0.04 to 0.20% of V and less than 0.005% of Al to regulate [O %] to 0.003 to 0.015% by weight, titanium is added thereto so as to satisfy a requirement represented by the formula: -0.006.ltoreq.[Ti %]-2[O %].ltoreq.0.008 to crystallize a titanium-based oxide in an amount of 20 particles/mm.sup.2 or more, and MnS, TiN and V(C, N) are deposited on the titanium-based oxide to disperse the titanium-based oxide as a composite precipitate in the steel to provide a cast slab, and a high-strength high-toughness shape steel having an excellent fire resistance is provided by a combination of water cooling between rolling passes at the time of rolling with accelerated cooling after the completion of the rolling.

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A Newly Developed Ti-Oxide Bearing Steel Having High Haz Toughness, Nov. 1989, ASTM STP 1042, K. Yamamoto, S. Matsuda, T. Haze, R. Chijiiwa, and H. Mimura, pp. 266-284, A. S. Melilli and E. G. Nisbett, Eds., American Society for Testing and Materials, 1989.
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