STEEL ALLOY FOR A LOW ALLOY STEEL FOR PRODUCING HIGH-TENSILE SEAMLESS STEEL TUBING

摘要

The invention relates to a steel alloy for a low alloy steel for producing high-tensile, weldable, hot-rolled seamless steel tubing, in particular construction tubing. The chemical composition (in % by mass) is: 0.15 - 0.18 % C; 0.20 - 0.40 % Si; 1.40 - 1.60 % Mn; max. 0.05 % P; max. 0.01 % S; >0.50 - 0.90 % Cr; > 0.50 - 0.80 % Mo; >0.10 - 0.15 % V; 0.60 - 1.00 % W; 0.0130 - 0.0220 % N; the remainder is made up of iron with production-related impurities; with the optional addition of one or more elements selected from Al, Ni, Nb, Ti, with the proviso that the relationship V/N has a value of between 4 and 12 and the Ni content of the steel is not more than 0.40 %.