Low alloy steel

Details Low alloy steel Low alloy steel

C - Chemistry, Metallurgy

22

C

75/120

C22C 38/22 (2006.01)

Patent

CA 1115092

ABSTRACT An improved hydrogen sulfide service, cryogenic steel is disclosed comprising carbon, manganese, phosphor- ous, sulphur, silicon, chromium, molybdenum with the balance iron having not-more than approximately 1% incidental steel-making residual elements, said steel having been heat treated and water quenched to develop a 50% tempered martensite micro-structure at the centre of the thickest section thereof. The disclosed steel is a low alloy, cryogenic steel suitable for hydrogen sulfide service and particularly suitable for arctic service in the petroleum industry. The present invention exhibits a high minimal hardenability which enables it to undergo a severe quench thus producing a micro-structure which exhibits high toughness and improved impact load resistance.

330112

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