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Exhaust-gas turbine

  • US 6,669,441 B2
  • Filed: 06/08/2001
  • Issued: 12/30/2003
  • Est. Priority Date: 06/09/2000
  • Status: Expired due to Term
First Claim
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1. An exhaust-gas turbine for a turbocharger, comprising:

  • a turbine casing having a spiral inlet duct;

    a rotor rotatably mounted in the turbine casing, an annular space of the turbine casing surrounding the rotor;

    an axial slide;

    a sliding sleeve; and

    a guide-blade cascade including guide blades, the guide-blade cascade being axially movable into the annular space near an outer circumference of the rotor, the guide-blade cascade being guided in an annular gap formed between an inner part and the turbine casing and being axially displaceable via the axial slide by the sliding sleeve;

    wherein the guide-blade cascade and at least one of the axial slide, the inner part and the sliding sleeve are formed from an austenitic cast steel material having the following components;

    C≦

    0.2%;

    Si 1.5-2.5%;

    Mn≦

    2.00%;

    P≦

    0.045%;

    S≦

    0.03%;

    Cr 24.0-26.0%;

    Ni 19-22%; and

    W≦

    5%.

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