STEEL WITH HIGH MECHANICAL STRENGTH AND WEAR RESISTANCE

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The invention relates to a steel with high mechanical strength and wear resistance. More specifically, the invention relates to a method of reducing the segregated veins of a steel having high mechanical strength, high wear resistance and the following weight composition : 0.30 %% = C = 1.42 %%; 0.05 %% = Si = 1.5 %%; Mn = 1.95 %%; Ni = 2.9 %%; 1.1 %% = Cr = 7.9 %%; 0.61 %% = Mo = 4.4 %%; optionally V = 1.45 %%, Nb = 1.45 %%, Ta = 1.45 %% and V+Nb/2 + Ta/4 = 1.45 %%; less than 0.1 %% borium, 0.19 %% (S + Se/2 + Te/4), 0.01 %% calcium, 0.5 %% rare earths, 1 %% aluminium, 1 %% copper; the remainder being iron and impurities resulting from the production thereof. The composition also comprises : 800 = D = 1150, where D = 540(C)0.25 + 245 (Mo + 3 V + 1.5 Nb + 0.75 Ta) 0.30 + 125 Cr0.20 + 15.8 Mn + 7.4 Ni + 18 Si. According to the invention, all or part of the molydenum is replaced by a double proportion of tungsten, such that W > 0.21 %%, and Ti, Zr, C are adjusted so that, after said adjustment, Ti + Zr/2 = 0.2 W, (Ti + Zr/2) X C = 0.07, Ti + Zr/2 = 1.49 %% and D is unchanged at 5 %%. The invention also relates to the steel obtained and to a method of producing a steel part. © KIPO & WIPO 2007