Niobium-containing weldable structural steel having good...

Details Niobium-containing weldable structural steel having good... Niobium-containing weldable structural steel having good...

C - Chemistry, Metallurgy

22

C

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C22C 38/14 (2006.01) C22C 38/04 (2006.01) C22C 38/12 (2006.01)

Patent

CA 1147173

ABSTRACT OF THE DISCLOSURE Disclosed herein is a niobium-containing weldable structural steel having good weldability which consists of 0.005 - 0.04% of C, 0.01 - 0.50% of Si, 1.20 - 2.50% of Mn, 0.01 - 0.07% of Nb, 0.005 - 0.030% of Ti, 0.005 - 0.06% of A? and the balance of iron and inevitable impurities whereby [C(%) + lON(%)] is not greater than 0.10% and Ti(%/[C(%) + lON(%)] is from 0.05 to 0.60 in order to restrict the amount of martensite islands in the weld heat affected zone to not greater than 15% in terms of the area fraction. Steel according to the present invention is advan- tageous for ultra-cold applications. The steel does not cause embrittlement of the weld heat affected zone and exhibits good notch toughness even when having been welded with a large weld heat input.

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