Process for producing extra high tensile steel in 1080 MPa yield

Details Process for producing extra high tensile steel in 1080 MPa yield Process for producing extra high tensile steel in 1080 MPa yield

1993-10-28

1995-09-05

Yee, Deborah

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

148653, C21D 802

Patent

active

054475813

ABSTRACT:
An extra high tensile steel having an excellent stress corrosion cracking resistance and a yield strength of 1080 MPa or more is provided. A slab comprising, in terms of % by weight, 0.03 to 0.08% of C, 0.01 to 0.10% of Si, 0.05 to 0.65% of Mn, 8.0 to 11.0% of Ni, 0.5 to 1.5% of Mo, 0.2 to 1.5% of Cr, 0.02 to 0.20% of V and 0.01 to 0.08% of Al with the balance consisting of iron and unavoidable impurities is heated to a temperature between 1000.degree. C. and 1250.degree. C., hot-rolled in an austenite recrystallization temperature region with a reduction ratio of 30 to 70%, subsequently rolled in an austenite nonrecrystallization temperature region with a reduction ratio of 20 to 60%, subjected to roll finishing, water-cooled from a temperature of 600.degree. C. or above, reheated to so as to have an area ratio of non-diffusion type reverse transformed austenite grains of 40 to 80% and an area ratio of diffusion type reverse transformed austenite grains of 20 to 60%, quenched and then tempered at a temperature of A.sub.c1 point or below.

REFERENCES:
patent: 4814141 (1989-03-01), Imai et al.
patent: 4826543 (1989-05-01), Yano et al.
patent: 4946516 (1990-08-01), Yano et al.

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