SWAGED STEEL, COLD-ROLLED STEEL SHEET AND METHOD FOR THE PRODUCTION OF SWAGED STEEL

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FIELD : metallurgy. SUBSTANCE : steel contains, wt % : C - 0.030-0.150, Si - 0.010-1.00, Mn - 0.50- less than 1.50, P - 0.001-0.060, S - 0.001-0.010, N - 0.0005-0.0100, Al - 0.010-0.050 and optionally one or several of the following elements : B - 0.0005-0.0020, Mo - 0.01-0.50, Cr - 0.01-0.50, V - 0.001-0.100, Ti - 0.001-0.100, Nb - 0.001-0.050, Ni - 0.01-1.00, Cu - 0.01-1.00, Ca - 0.0005-0.0050, rare-earth metals - 0.0005-0.0050, iron and unavoidable impurities making the rest. The microstructure of the steel contains from 40% to 95% by the share of the ferrite area and from 5% to 60% by the share of martensite, and also, if necessary, one or more of the following phases : 10% or less perlite, 5% or less of residual austenite by volume fraction and less than 40% by the proportion of bainite area. The amount of the share of the ferrite area and the share of martensite is 60% or more. EFFECT : steel has high formability, high chemical conversion treatment properties and coating adhesion. 20 cl, 8 dwg, 5 tbl