FIELD: metallurgy.
SUBSTANCE: low-temperature resistant H-beam hot-rolled steel of strength class 355 MPa used in shipbuilding. Steel contains chemical components, wt.%: С: 0.05-0.09, Si: 0.015-0.30, Mn: 1.20-1.50, R≤0.015 S≤0.010, Nb: 0.02-0.040, Ti: ≤0.008-0.025, Ni: 0.10-0.50, Al: 0.015-0.050, V: 0.0003-0.0008, As+Sn+Cu+Zn≤0.04, the rest is Fe and inevitable impurities, and the controlled content of gases in steel during melting is, wt.%: N≤0.0040, total oxygen content (T.[O])≤0.0015.
EFFECT: steel has the required mechanical properties at low temperatures.
4 cl, 3 dwg, 4 tbl
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