| 摘要 |
<p>The invention concerns a method for making an abrasion-resistant steel part consisting of 0.1 % </= C </= 0.23 %; 0 % </= Si </= 2 %; 0 % </= AI </= 2 %; 0.5 % </= Si + AI </= 2 %; 0 % </= Mn </= 2.5 %; 0 % </= Ni </= 5 %; 0 % </= Cr </= 5 %; 0 % </= Mo </= 1 %; 0 % </= W </= 2 %; 0.05 % </= Mo +W/2 </= 1 %; 0 % </= B </= 0.02 %; 0 % </= Ti </= 0.67 %; 0 % </= Zr </= 1.34 %; 0.05 % < Ti + Zr/2 </= 0.67 %; 0 % </= S </= 0.15 %; N < 0.030, optionally 0 % to 1.5 % of Cu; optionally Nb, Ta and V such that Nb/2 + Ta/4 + V </= 0.5 %; optionally Se, Te, Ca, Bi, Pb contents </= 0.1 %; the rest being iron and impurities. Additionally: 0.095 % </= C* = C - Ti/4 - Zr/8 + 7xN/8, Ti + Zr/2 - 7xN/2 </= 0.05 % and 1.05xMn + 0.54xNi +0.5OxCr + 0.3x(Mo + W/2)<1/2> + K > 1.8, with K = 1 if B >/= 0.0005 % and K = 0 if B < 0.0005 %. After austenitization, the method consists in: cooling at a speed > 0.5 DEG C/s between AC3 and T = 800 - 270xC* - 90xMn -37xNi - 70XCr - 83x(Mo + W/2) and about T-50 DEG C; then cooling at a speed 0.1 < VR < 1150XEP<-1.7> between T and 100 DEG C, (ep = thickness of plate in mm); cooling down to room temperature and optionally planishing. The invention also concerns the resulting plate.</p> |
