Method for improving resistant property of heat resistant steel for high-temperature water vapour oxidation

Method for improving resistant property of heat resistant steel for high-temperature water vapour oxidation

  • CN 101,225,465 B
  • Filed: 01/31/2008
  • Issued: 02/15/2012
  • Est. Priority Date: 01/31/2008
  • Status: Active Grant
First Claim
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1. a method that improves resistant property of heat resistant steel for high-temperature water vapour oxidation is characterized in that:

  • the laser surface remelting is carried out on pending high temperature steel surface handled, make the high temperature steel top layer with 10 3

    10 7

    /fusing that heats up of the speed of s, then with 10 3

    /the above rate of cooling of s solidifies;

    Form the fine grained region of grain-size below 25 μ

    m on high temperature steel surface, lattice imperfections such as the high-density crystal boundary through this processing layer, subgrain boundary, twin boundary, dislocation, room promote elemental diffusion such as Cr, Si to improve high temperature resistance steam oxidation performance.

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