Steel that is exposed to hydrogen sulfide

Details Steel that is exposed to hydrogen sulfide Steel that is exposed to hydrogen sulfide

1985-04-24

1986-12-23

Stallard, Wayland

Metal treatment

Compositions

Heat treating

148 123, C21D 708

Patent

active

046310959

ABSTRACT:
A ferritic perlite steel is used for pipes and tubing to be highly resistant against stress corrosion cracking when exposed to H.sub.2 S, and having following alloying range, all percentages by weight: from 0.3 to 0.45 C, from 1.4 to 1.8 Mn, from 0.2 to 0.5 Si, from 0.2 to 0.5 Cr, from 0.04 to 0.1 V, up to 0.06 Nb, .ltoreq.0.003 S, the remainder being iron whereby the combined Niobium and Vandium content must obey the rule that the sum of the V content plus twice the Nb content must not be not less than 0.1%; tubing is made by hot working followed by cooling in air from the final temperature attained during hot working, so that a texture and grain size in accordance with ASTM finer than 8 obtains; the tubing has strength value of 552 N/mm.sup.2 .ltoreq.0.2% of rupture elongation limit .ltoreq.655 N/mm.sup.2 and a tensile strength exceeding 655 N/mm.sup.2.

REFERENCES:
patent: 4354882 (1982-10-01), Greer
patent: 4370178 (1983-01-01), Waid et al.
patent: 4388123 (1983-06-01), Murayama et al.
patent: 4394189 (1983-07-01), Greer
patent: 4414042 (1983-11-01), Gross et al.
patent: 4494999 (1985-01-01), Graf

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