| 摘要 |
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 % </= AI </= 2 %; 0.35 % </= Si + AI </= 2 %; 0 % </= Mn </= 2.5 %; 0 % </= Ni </= 5 %; 0 % </= Cr </= 5 %; 0 % </= Mo </= 0.050; 0 % </= W </= 1 %; 0,1 % </= Mo +W/2 </= 0.5 %; 0 % </= B </= 0.02 %; 0 % </= Ti </= 2 %; 0 % </= Zr </= 4 %; 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 + 7xN/8 </= 0.55 % and 1.05xMn + 0.54xNi +0.5OxCr + 0.3x(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/2-7xN/2 >/= 0.05 %; hardening after austenitization while cooling at a speed > 0,5 DEG C/s between a temperature > AC3 and ranging between T = 800 - 270xC* - 9OxMn -37xNi - 70XCr - 83x(Mo + W/2) and T-50 DEG C; then at a core speed Vr < 1150XEP<-1.7> between T and 100 DEG C, (ep = plate thickness in mm); cooling down to room temperature. The invention also concerns the resulting plate |
