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Method of manufacture of a piston for an internal combustion engine, and piston thus obtained

  • US 7,472,674 B2
  • Filed: 12/04/2003
  • Issued: 01/06/2009
  • Est. Priority Date: 12/05/2002
  • Status: Expired due to Fees
First Claim
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1. Method of manufacture of a piston for an internal combustion engine, the said piston being formed from a steel part cast in one piece, wherein heating of a billet is carried out so as to bring it to an intermediate temperature between its solidus temperature and its liquidus temperature, and that shaping thereof by thixoforging is carried out, wherein the steel piston has a composition, in percentages by weight, of:

  • 0.35%≦

    C≦

    1.2%0.10%≦

    Mn≦

    2.00%0.10%≦

    Is≦

    1.0%traces≦

    Cr≦

    4.5%traces≦

    Mo≦

    2.0%traces≦

    Ni≦

    4.5%traces≦

    V≦

    0.5%traces≦

    Cu≦

    3.5%traces≦

    Al≦

    0.060%traces≦

    Ca≦

    0.050%traces≦

    B≦

    100 ppmtraces≦

    Ti≦

    0.050%traces≦

    Nb≦

    0.050%the other elements being iron and conventional impurities resulting from the manufacture.

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