Steel for mechanical parts, method for producing mechanical...

Details Steel for mechanical parts, method for producing mechanical... Steel for mechanical parts, method for producing mechanical...

C - Chemistry, Metallurgy

22

C

C22C 38/22 (2006.01) C22C 38/26 (2006.01) C22C 38/60 (2006.01) C23C 8/22 (2006.01) C23C 8/32 (2006.01)

Patent

CA 2559562

The inventive steel for mechanical parts is characterised by the composition thereof expressed in the following percentages by weight: 0.19 % = C = 0.25 %; 1.1 % = Mn = 1.5 %; 0.8 % = Si = 1.,2 %; 0.01 % = S = 0.09 %; traces = P = 0.025 %; traces = Ni= 0.25 %; 1 % = Cr = 1.4 %; 0.10 % = Mo = 0,25 %; traces = Cu= 0.30 %; 0.01 % = Al = 0.045 %; 0.010 % = Nb = 0.045 %; 0.0130 % = N = 0.0300 %; optionally traces = Bi = 0.10 % and/or traces = Pb = 0.12 % and/or traces = Te = 0.015 % and/or traces = Se = 0.030 % and/or traces = Ca= 0.0050 %. The rest being iron and impurities resulting from preparation, a chemical composition being adjusted in such a way that mean values J3m, J11m, J15m et J25m of five Jominy tests are such as .alpha. = | J11m - J3m x 14/22 - J25mx 8/22 |= 2.5 HRC; and ß = J3m - J15m = 9 HRC. A method for producing a mechanical part from said steel and the thus obtainable mechanical part are also disclosed.

Acier pour pièces mécaniques, caractérisé en ce que sa composition est, en pourcentages pondéraux : - 0,19% <= C <= 0,25% ; - 1,1% <= Mn <= 1,5% ; - 0,8% <= Si <= 1,2% ; - 0,01 % <= S <= 0,09% ; - traces <= P <= 0,025% ; - traces <= Ni<= 0,25% ; -1% <= Cr <= 1,4% ; - 0,10% <= Mo <= 0,25% ; - traces <= Cu<= 0,30% ; - 0,01% <= Al <= 0,045% ; - 0,010% <= Nb <= 0,045% ; - 0,0130% <= N <= 0,0300% ; - optionnellement traces <= Bi <= 0,10% et/ou traces <= Pb <= 0,12% et/ou traces <= Te <= 0,015% et/ou traces <= Se <= 0,030% et/ou traces <= Ca<= 0,0050% ; le reste étant du fer et des impuretés résultant de l'élaboration, la composition chimique étant ajustée pour que les valeurs moyennes J3m, J11m, J15met J25m de cinq essais Jominy soient telles que: .alpha. = | J11m - J3m x 14/22 - J25mx 8/22 |<= 2,5 HRC ; et ~ = J3m - J15m <= 9 HRC. Procédé de fabrication d'une pièce mécanique utilisant cet acier, et pièce mécanique ainsi obtenue.

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