| 摘要 |
A wide-flange beam (H-shaped) with high toughness and yield stength can be made from a steel, consisting of, by weight from about 0.05 to 0.18% C, up to about 0.60% Si, from about 1.00% to about 1.80% Mn, up to about 0.020% P, under 0.004% S, from 0.016% to 0.050% Al, from 0.04% to 0.15% V, and from 0.0070% to 0.0200% N, and one or more of from about 0.02% to about 0.60% Cu, from about 0.02% to about 0.60% Ni, from about 0.02% to about 0.50% Cr, and from about 0.01% to about 0.20% Mo; and the balance being Fe and incidental impurities. Also, (V x N)/S ≥ 0.150; the Ti content is within a rage satisfying 0.002 ≤ Ti ≤ 1.38 x N-8.59 x 10<-4>; Ceq (= C + Si/24 + Mn/6 + Ni/40 + Cr/5 + Mo/4 + V/14) is within a rage of from about 0.36 wt% to about 0.45 wt%, and the yield strength is at least 325 MPa. |
