| 摘要 |
The invention concerns a method for making an abrasion resistant steel plate having a chemical composition comprising, wt. %: 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 ; 0.1 ? Mo + W/2 ? 0.5 ; 0 ? B ? 0.02 ; 0 ? Ti ? 2 ; 0.05 ? Ti + Zr/2 ? 2 ; 0 ? S ? 0.15 ; N ? 0.03 ; optionally 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 if B < 0.0005 % and Ti + Zr/2 - 7 ? N/2 ? 0.05 %; hardening after austenitization while cooling at a speed >0.50C/s between a temperature >AC3 and ranging between and T-500C; then at a core speed ep-1.7 between T and 1000C, (ep=plate thickness in mm); cooling down to room temperature. The invention also concerns the resulting plate.
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