High-nitrogen austenitic stainless steel

  • US 20060034724A1
  • Filed: 08/11/2005
  • Published: 02/16/2006
  • Est. Priority Date: 08/13/2004
  • Status: Abandoned Application
First Claim
Patent Images

1. A high-nitrogen austenitic stainless steel having a Fe content of 50% by mass or more, and containing:

  • Cr;

    15.0% by mass to 35.0% by mass;

    Mo;

    0.05% by mass to 8.0% by mass;

    Mn;

    0.2% by mass to 10.0% by mass;

    Cu;

    0.01% by mass to 4.0% by mass; and

    N;

    0.8% by mass to 1.5% by mass, both ends inclusive, having a C content of 0.20% by mass or less, a Si content of 2.0% by mass or less, a P content of 0.03% by mass or less, a S content of 0.05% by mass or less, a Ni content of 0.5% by mass or less, an Al content of 0.03% by mass or less, and an 0 content of 0.020% by mass or less;

    wherein the contents of Cr, Mo, N and Mn are adjusted so that a compositional parameter □

    expressed by the equation;






    (WCr+3.3WMo+16WN)/WMn where WCr is Cr content (% by mass), WMo is Mo content (% by mass), WN is N content (% by mass) and WMn is Mn content (% by mass) has a value of 5 or above;

    and optionally further containing either one of, or both of;

    W;

    0.01% by mass to 1.0% by mass; and

    Co;

    0.01% by mass to 5.0% by mass, both ends inclusive;

    and optionally further containing at least one of;

    Ti;

    0.01% by mass to 0.5% by mass;

    Nb;

    0.01% by mass to 0.5% by mass;

    V;

    0.01% by mass to 1.0% by mass; and

    Ta;

    0.01% by mass to 0.5% by mass, both ends inclusive;

    and optionally further containing at least one of;

    B;

    0.001% by mass to 0.01% by mass;

    Zr;

    0.01% by mass to 0.50% by mass;

    Ca;

    0.001% by mass to 0.01% by mass; and

    Mg;

    0.001% by mass to 0.01% by mass, both ends inclusive;

    and optionally further containing either one of, or both of;

    Te;

    0.005% by mass to 0.05% by mass; and

    Se;

    0.01% by mass to 0.20% by mass, both ends inclusive.

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