FIELD: metallurgy.
SUBSTANCE: invention relates to high-strength hot-rolled double-tee steel used for construction of buildings. High-strength hot-rolled double-tee steel for construction of buildings contains the following chemical components, wt.%: C: from 0.06 to 0.10%, Si: ≤0.25%, Mn: from 0.8 to 1.30%, P ≤0.015%, S ≤0.008%, Cu: from 0.15 to 0.25%, Cr: from 0.25 to 0.60%, Ni: from 0.10 to 0.19%, V: from 0.01 to 0.03%, Al: from 0.01 to 0.03%, RE: from 0.009 to 0.019%, As+Sn+Zn+Pb+Ca+Mg: ≤0.035%, N: ≤0.008%, T. [O]: ≤0.002%, the rest is Fe and unavoidable impurities.
EFFECT: reduced weight of structural steel at simultaneous provision of good corrosion resistance and properties in direction of thickness, as well as impact strength at low temperatures.
9 cl, 3 dwg, 5 tbl, 6 ex
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