Steel composition and parts forged by a forging die

摘要

The invention relates to a steel composition, comprising the following components: C; 0.12-0.45 wt. % Si; 0.10-1.00 wt. % Mn; 0.50-1.95 wt. % S; 0.005-0.060 wt. % Al; 0.004-0.050 wt. % Ti; 0.004-0.050 wt. % Cr; 0-0.60 wt. % Ni; 0-0.60 wt. % Co; 0-0.60 wt. % W; 0-0.60 wt. % B; 0-0.01 Mo; 0-0.60 wt. % Cu; 0-0.60 wt. % Nb; 0-0.050 wt. % V; 0.10-0.40 wt. % N; 0.015-0.040 wt. % remaining: Fe and unavoidable impurities with the proviso that: 1) wt. % V×wt. % N=0.0021 0.0120 2) 1.6×wt. % S+1.5×wt. % Al+2.4×wt. % Nb+1.2×wt. % Ti=0.035 0.140 3) 1.2×wt. % Mn+1.4×wt. % Cr+1.0×wt. % Ni+1.1×wt. % Cu+1.8×wt. % Mo=1.00 3.50. The steel composition is highly suitable for use in the production of highly resistant, highly tenacious parts forged by a forging die without terminal quenching, which can be used as chassis parts for passenger cars and commercial vehicles.