Process for producing extra high tensile steel having excellent

Details Process for producing extra high tensile steel having excellent Process for producing extra high tensile steel having excellent

1997-01-17

1998-10-27

Ip, Sikyin

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

148653, 148654, C21D 600

Patent

active

058273794

ABSTRACT:
An extra high tensile steel having an excellent stress corrosion cracking resistance in sea water and a yield strength of 1080 MPa or more is provided. A slab comprising, in terms of % by weight, 0.04 to 0.09% 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 at a temperature of Ar' point or above, air-cooled, reheated at a rate of 120.degree. C./min or less to a temperature region of from (A.sub.C3 point--40.degree. C.) to (A.sub.C3 point+40.degree. C.), quenched and subsequently tempered at a temperature of the A.sub.C1 point or below.

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Patent Abstract of Japan, vol. 16, No. 63 (C-911) Feb., 1992 JP32-60012 Nov. 20, 1991.
European Search Report EP 93 11 7410.6 Apr. 27, 1994.

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