Method of manufacturing pressure vessel steel with high strength

Details Method of manufacturing pressure vessel steel with high strength Method of manufacturing pressure vessel steel with high strength

1987-05-26

1988-07-05

Rutledge, L. Dewayne

Metal treatment

Compositions

Heat treating

148 124, C21D 800

Patent

active

047552344

ABSTRACT:
A method of manufacturing pressure vessel steel having high strength and high toughness comprising the steps of heating steel to a temperature higher than 1200.degree. C., said steel containing from 0.03 to 0.12 wt. % C, 0.10 to 0.8 wt. % Si, 0.45 to 1.00 wt. % Mn, 0.80 to 3.50 wt. % Cr, 0.10 to 1.60 wt. % Mo, 0.10 to 0.53 wt. % Ni, 0.010 to 0.040 wt. % soluble aluminum, at least one of 0.05 to 0.40 wt. % V and 0.02 to 0.20 wt. % Nb, less than 0.010 wt. % Ti, 0.0002 to 0.0010 wt. % B, and less than 0.004 wt. % N, the balance of iron and impurities, the N and Ti satisfying the following equation

REFERENCES:
patent: 4325748 (1982-04-01), Nashiwa et al.
patent: 4381940 (1983-05-01), Watanabe et al.
patent: 4394184 (1983-07-01), Ohtani et al.
patent: 4406711 (1983-09-01), Nagumo et al.
patent: 4572748 (1986-02-01), Suga et al.

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