Steel for mechanical parts, Manufacturing process of mechanical parts and mechanical parts made using it that way

摘要

Steel for mechanical parts, characterized in that its composition is in weight percentage: 0.19% or less (less than or equal to 0.25%, 1.1% lower or equal or less 1.5% Mn; 0.8% or less, if less than or equal to 1.2%, 0.01% or less s or less 0.09%; Traces i p less than or equal to or less than Gual 0.025%; TRACES less than or equal to or less than or equal to 0.25% - 1% or less CR less than or equal to 0, 1.4%;10% or less and less than or equal to 0.25% or less; trace cu less than or equal to 0.30% and 0.01% less than or equal to equal to or less than 0.045%, 0.010 per cent less than or equal to 0.045% NB or less; 00130% less than or equal to n or less 00300% or less; optionally Trace bi equal to or less than 0.10% Lower and / or trace EQUAL or less than or equal to 0.12% Pb and / or TRACES you less or equal 0,015% and / or TRACES or less is less than or equal to 30% or less and / or Trace ca or less csd2009-00050%; the rest is Iron and Impurities of the preparation, the chemical composition is adjusted to the average values j3m, j11m j15m and five j25m Jominy tests are such that: alpha = [j11m - J 3m x 14 x 8 / 22 / 22] j25m HRC 2.5 or less; and j3m J5M beta = - less than or equal to 9 HRC.Manufacturing process of a Mechanical part that uses that steel, and Mechanical part, obtained in this way.