Importance

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Abstract

The invention concerns a method for making an abrasion resistant steel plate having a chemical composition comprising: 0.35%≦C≦0.8%, 0%≦Si≦2%, 0%≦Al≦2%, 0.35%≦Si+Al≦2%, 0%≦Mn≦2.5%, 0%≦Ni≦5%, 0%≦Cr≦5%, 0%≦Mo≦0.50%, 0%≦W≦1.00%, 0.1%≦Mo+W/2≦0.50%, 0%≦B≦0.02%, 0%≦Ti≦2%, 0%≦Zr≦4%, 0.05%≦Ti+Zr/2≦2%, 0%≦S≦0.15%, N<0.03%; optionally from 0% to 1.5% of Cu; optionally Nb, Ta or V with Nb/2+Ta/4+V≦0.5%; optionally less than 0.1% of Se, Te, Ca, Bi or Pb; the rest being iron and impurities; the composition satisfying: 0.1%≦C*=C−Ti/4−Zr/8+7×N/8≦0.55% and 1.05×Mn+0.54×Ni+0.50×Cr+0.3×(Mo+W/2)^1/2+K>1.8, with K=0.5 if B≧0.0005% and K=0 if B<0.0005% and Ti+Zr/2−7×N/2≧0.05%; hardening after austenitization while cooling at a speed>0.5° C./s between a temperature>AC₃ and ranging between T=800−270×C*−90×Mn−37×Ni−70×Cr−83×(Mo+W/2) and T−50° C.; then at a core speed Vr<115×ep^−1.7 between T and 100° C., (ep=plate thickness in mm); cooling down to room temperature. The invention also concerns the resulting plate.

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First Claim