Heat-resistant austenitic steel having high resistance to stress relaxation cracking

Heat-resistant austenitic steel having high resistance to stress relaxation cracking

  • CN 102,482,749 A
  • Filed: 07/20/2010
  • Published: 05/30/2012
  • Est. Priority Date: 07/22/2009
  • Status: Active Grant
First Claim
Patent Images

1. one kind to the insensitive austenitic steel of lax cracking, has by weight percentage to comprise following composition:

  • 0.019%



    C≤

    0.030%

    0.5%



    Mn≤

    3%

    0.1%



    Si≤

    0.75%

    Al≤

    0.25%

    18%



    Cr≤

    25%

    12%



    Ni≤

    20%

    1.5%



    Mo≤

    3%

    0.001%



    B≤

    0.008%

    0.25%



    V≤

    0.35%

    0.23%



    N≤

    0.27%



    Surplus is iron and unavoidable impurities, and wherein;

    Ni (eq.) >

    =1.11Cr (eq.)-8.24, wherein;

    Cr(eq)=

    Cr+Mo+1.5Si+5V+3Al+0.02Ni (eq)=Ni+30C+x (N-0.045)+0.87 is wherein;

    For 0.23%≤

    N≤

    0.25%, x=22For 0.25%≤

    N≤

    0.27%, x=20.

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