Method of producing rolled steel having excellent resistance to

Details Method of producing rolled steel having excellent resistance to Method of producing rolled steel having excellent resistance to

1988-01-22

1989-07-25

Yee, Deborah

Metal treatment

Compositions

Heat treating

148 123, C21D 800

Patent

active

048510548

ABSTRACT:
Disclosed herein is a rolled steel having excellent resistance to sulfide stress corrosion cracking. It comprises 0.20-0.40 wt. % C, .ltoreq.0.50 wt. % Si, .ltoreq.1.90 wt. % Mn, .ltoreq.0.06 wt. % Al, 0.0030-0.0090 wt. % N, 0.005-0.10 wt. % Nb, 0.005-0.050 wt. % Ti, and the balance iron and inevitable impurities. The rolled steel contains at least 4.times.10.sup.8 ultrafine carbonitride particles or 0.1 .mu.m or smaller per mm.sup.3 as a result that a bloom or slab having the above components is soaked, subjected at 1200.degree.-950.degree. C. to rough rolling under conditions of a total reduction percentage of 75% or lower, cooled at a cooling rate of 1.5.degree. C./sec. or higher after completion of the rough rolling and until the initiation of finish rolling, and then completed with its final rolling above the A.sub.1 transformation temperature. A process for producing the above rolled steel is also disclosed.

REFERENCES:
patent: 4415376 (1983-11-01), Bramfitt et al.
Greday et al., "The Combined Effect of Microalloying Steels with Columbium and Vanadium", Micro Alloying 75, Session 1, Wednesday, Oct. 1, 1975, Washington D.C., pp. 145-158.
Gray, "Precipitation in Mild Steels Containing Small Additions of Niobium", Journal of the Iron & Steel Institute, Aug. 1965, pp. 812-818.

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