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Abstract

The invention concerns a method for making an abrasion-resistant steel part consisting of 0.1%.ltoreq.C.ltoreq.0.23%; 0%.ltoreq.Si.ltoreq.2%; 0%.ltoreq.AI.ltoreq.2%; 0.5%.ltoreq.Si+AI.ltoreq.2%; 0%.ltoreq.Mn.ltoreq.2.5%; 0%.ltoreq.Ni.ltoreq.5%; 0%.ltoreq.Cr.ltoreq.5%; 0%.ltoreq.Mo.ltoreq.1%; 0%.ltoreq.W.ltoreq.2%; 0.05%.ltoreq.Mo+W/2.ltoreq.1%; 0%.ltoreq.B.ltoreq.0.02%; 0%.ltoreq.Ti.ltoreq.0.67%; 0%.ltoreq.Zr.ltoreq.1.34%; 0.05%.ltoreq.Ti+Zr/2.ltoreq.0.67%; 0%.ltoreq.S.ltoreq.0.15%; N<0.030, optionally 0% to 1.5% of Cu; optionally Nb, Ta and V such that Nb/2+Ta/4+V.ltoreq.0.5 %; optionally Se, Te, Ca, Bi, Pb contents .ltoreq.0.1%; the rest being iron and impurities. Additionally: 0.095%.ltoreq.C*=C-Ti/4-Zr/8+7.times.N/8, Ti+Zr/2-7.times.N/2.ltoreq.0.05% and 1.05.times.Mn+0.54.times.Ni+0.5O.times.Cr+0.3.times.(Mo++W1/2).sup.1/2+K&-gt;1.8, with K=1 if B.gtoreq.0.0005% and K=0 if B<0.0005%. After austenitization, the method consists in: cooling at a speed >0.5.degree. C./s between AC.sub.3 and T=800-270.times.C*-90.times.Mn-37.times.Ni-70.times.Cr-83.times.(Mo+W/2) and about T-50.degree. C.; then cooling at a speed 0.1

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First Claim