Refractory shape steel material containing oxide and process for

Details Refractory shape steel material containing oxide and process for Refractory shape steel material containing oxide and process for

1993-09-20

1994-08-09

Yee, Deborah

Metal treatment

Stock

Ferrous

148546, C21D 802, C22C 3814

Patent

active

053363396

ABSTRACT:
A cast strip for an H-shape steel having excellent fire resistance and toughness for use as a structural member for constructions and a shape steel having a flange, such as an I-shape steel, produced by accelerated cooling and controlled rolling of the cast slab, are produced in an in-line manner.
After the regulation of the oxygen concentration of a molten steel by a predeoxidation treatment in a steel making process to form a steel having predetermined ingredients, the steel is subjected to final deoxidation with a minor amount of Al to provide a cast slab containing, in a dispersed state, compound oxide precipitate having a capability of forming intragranular ferrite. The stead is then subjected to a treatment comprising a combination of water cooling between rolling passes with accelerated cooling after hot rolling to attain refinement of the structure and a low alloy steel, thereby improving the strength at room temperature and at high temperature and the toughness.

REFERENCES:
patent: 4634573 (1987-01-01), Yanagiya et al.
patent: 4851052 (1989-07-01), Nishioka et al.
patent: 4990196 (1991-02-01), Tamehiro et al.
A Newly Developed Ti-Oxide Bearing Steel Having High HAZ Touchness, K. Yamamoto, S. Matsuda, et al., Nov. 1989, ASTM STP 1042, A. S. Melilli & E. G. Nisbett, Eds. (1989) pp. 266-284 (ASTM).
Non-Metallic inclusions in ferritic steel weld metals--a review Welding in the World, vol. 27, No. 3/4, 1989, pp. 11-28.

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