FIELD: metallurgy.
SUBSTANCE: invention relates to metallurgy, namely to fire-resistant steel strip resistant to atmospheric effects. Fire-resistant steel strip has the following chemical composition, wt.%: C 0.02–0.06, Si 0.1–0.55, Mn 0.4–1.7, P ≤ 0.03, S ≤ 0.007, Cr 0.3–0.8, Mo 0.20–0.60, N 0.004–0.010, Als < 0.001, B 0.001–0.006, one or both of Cu 0.1–0.6 and Sn 0.005–0.04, optionally Nb 0.01–0.08, total oxygen [O]T 0.007–0.020, Fe and unavoidable impurities are the rest, with Mn/S ≥ 250, and Pcm ≤ 0.27 wt.%, where Pcm=C+Si/30+Mn/20+Cu/20+Cr/20+Mo/15+5B.
EFFECT: providing a high level of strength at high temperature, as well as high resistance to seismic effects.
16 cl, 7 dwg, 8 tbl
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