ALLOY STEEL TO OBTAIN LOW-ALLOY HIGH-STRENGTH STEEL

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FIELD : metallurgy. SUBSTANCE : steel features the following chemical composition, in wt % : 0.10-0, 70 C; 0.25-4.00 Si; 0.05-3.00 Al; 1.00-3.00 Mn; 0.10-2.00 Cr; 0.001-0.50 Nb; 0.001-0.025 N; not more than 0.15 P; not more than 0.05 S; the rest is iron with impurities arising from melting during the optional addition of one or several elements : Mo, Ni, Co, W, Ti or V, and Zr and the rare earths. To prevent primary precipitates of AlN, following condition is complied : Al×N4×C (wt %). The average size of prior austenite grain is not more than 100 microns, and the average distance between austenite plates is less than 750 nm. EFFECT : steel has the desired toughness and high wear resistance. 8 cl, 7 dwg, 1 tbl