STEEL ALLOY FOR A LOW-ALLOY HIGH-STRENGTH STEEL

摘要

A low alloy high-strength carbide-free bainitic steel for producing strips, sheets and pipes is disclosed with the following chemical composition (in weight %) 0.10-0.70 C, 0.25-4.00 Si, 0.05-3.00 Al, 1.00-3.00 Mn, 0.10-2.00 Cr, 0.001-0.50 Nb, 0.001-0.025 N, max 0.15 P, max 0.05 S, remainder iron and steel tramp elements with optional addition of one or more elements of Mo, Ni, Co, W, Nb, Ti, or V and Zr and rare earths with the proviso the for avoiding primary precipitations of AlN the condition Al×N<5×10−3 (weight %) and for suppressing the cementite formation the condition Si+Al>4×C (weight %) are satisfied.

主权项

1. A steel alloy for a low alloy high-strength carbide-free bainitic steel for producing strips, sheets and pipes with the following chemical composition (in weight %):
0.10-0.70 C 0.25-4.00 Si 0.05-3.00 Al 1.00-3.00 Mn 0.10-2.00 Cr 0.001-0.50 Nb 0.001-0.025 N max 0.15 P max 0.05 S remainder iron and steel tramp elements with optional addition of one or more elements of Mo, Ni, Co, W, Nb, Ti, or V and Zr and rare earths with the proviso the for avoiding primary precipitations of AlN the condition Al×N<5×10−3 (weight %) and for suppressing the cementite formation the condition Si+Al>4×C (weight %) is satisfied.