Heavy-wall H-shaped steel having high toughness and yield streng

Details Heavy-wall H-shaped steel having high toughness and yield streng Heavy-wall H-shaped steel having high toughness and yield streng

1999-02-25

1999-12-28

Yee, Deborah

Metal treatment

Stock

Ferrous

148332, 148333, 148334, 148336, 148654, C22C 3804, C22C 3806, C22C 3812, C21D 713

Patent

active

060076445

ABSTRACT:
A high-strength heavy-wall H-shaped steel is excellent in Z-direction toughness at the flange thickness center. The heavy-wall H-shaped steel is comprised 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.times.N)/S.gtoreq.0.150; the Ti content is within a range satisfying 0.002.ltoreq.Ti.ltoreq.1.38.times.N-8.59.times.10.sup.-4 ; Ceq (=C+Si/24+Mn/6+Ni/40+Cr/5+Mo/4+V/14) is within a range of from about 0.36 wt % to about 0.45 wt %, and the yield strength is at least 325 MPa.

REFERENCES:
patent: 4397697 (1983-08-01), Freier et al.

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