LOW ALLOY STEEL WITH A HIGH YIELD STRENGTH AND HIGH SULPHIDE STRESS CRACKING RESISTANCE

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A steel contains, by weight : C : 0.3% to 0.5%, Si : 0.1% to 0.5%, Mn : 0.1% to 1%, P : 0.03% or less, S : 0.005% or less, Cr : 0.3% to 1.5%, Mo : 1.0% to 1.5%, Al : 0.01% to 0.1%, V : 0.03% to 0.06%, Nb : 0.04% to 0.15%, Ti : 0 to 0.015%, N : 0.01% or less, the remainder of the chemical com-position of the steel being constituted by Fe and impurities or residuals resulting from or necessary to steel production and casting processes. The steel enables to produce seamless tubes with a yield strength after heat treatment of 862 MPa or more which are particularly SSC-re-sistant.