Steel that is exposed to hydrogen sulfide

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

C - Chemistry, Metallurgy

21

D

148/34.6

C21D 8/10 (2006.01) C22C 38/04 (2006.01)

Patent

CA 1239332

ABSTRACT OF THE DISCLOSURE A ferritic perlite steel is used for pipes and tubing to be highly resistant against stress corrosion cracking when exposed to H2S, the steel having following the component ranges, in 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, up to 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 cool- ing 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 having a strength value of 552 N/mm2 ? 0,2% of rupture elongation limit ? 655 N/mm2 and a tensile strength exceeding 655 N/mm.2.

479760

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