STEEL FOR WELDED STRUCTURES AND METHOD FOR ITS OBTAINING Russian patent published in 2012 - IPC C22C38/14 

FIELD: metallurgy.

SUBSTANCE: steel contains the following components, wt %: C from 0.015 to 0.045, Si from 0.05 to 0.20, Mn from 1.5 to 2.0, Ni from 0.10 to 1.50, Ti from 0.005 to 0.015, O from 0.0015 to 0.0035, N from 0.002 to 0.006, the rest is Fe and unpreventable impurities. In steel there limited is the content of P 0.008 % or less, S 0.005 % or less, Al 0.004 % or less, Nb 0.005 % or less, Cu 0.24 % or less, V 0.020 % or less. Steel composite parameter P_CTOD amounts 0.065 % or less, and steel hardness composite parameter CeqH amounts 0.235% or less.

EFFECT: steel is very strong at high values of crack resistance.

4 cl, 5 dwg, 4 tbl, 1 ex