Method for producing a high toughness and high tensile steel

Details Method for producing a high toughness and high tensile steel Method for producing a high toughness and high tensile steel

C - Chemistry, Metallurgy

21

D

75/146, 148/31

C21D 8/00 (2006.01)

Patent

CA 1055369

ABSTRACT OF THE DISCLOSURE A method for producing a high toughness, high tensile strength steel plate comprises subjecting to a low temperature rolling a steel composition containing not more than 0.25% of carbon, not more than 0.5% of silicon, 0.5 to 2.0% of manganese, not more than 0.015% of sulfur, 0.005 to 0.1% of aluminum, not more than 0.025% of phosphorus, one or more of niobium, vanadium and titanium in an amount not less than 0.01%, and at least one rare earth metal (REM), such that REM/S is not less than 1.3 and optionally one or more of nickel, chromium and copper, with the balance being iron and unavoid- able imputities; the steel shows low notch toughness transit- ion temperature and high absorbed energy in the notch-impact test, and is suitable under as rolled condition for use as pipe lines in cold district.

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