Low-alloy steel, seamless steel pipe for oil well, and process for producing seamless steel pipe

Low-alloy steel, seamless steel pipe for oil well, and process for producing seamless steel pipe

  • CN 101,542,002 A
  • Filed: 03/28/2008
  • Published: 09/23/2009
  • Est. Priority Date: 03/30/2007
  • Status: Active Application
First Claim
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1. a low alloy steel is characterized in that,This low alloy steel is in quality %, contain below C:

  • 0.10~

    0.20%, Si;

    0.05~

    1.0%, Mn;

    0.05~

    1.5%, Cr;

    1.0~

    2.0%, Mo;

    0.05~

    2.0%, the Al;

    0.10% and Ti;

    0.002~

    0.05%, and the numerical value of the Ceq that is obtained by following formula (1) is more than 0.65, remainder is made of Fe and impurity, P in the impurity is below 0.025%, S is below 0.010%, N is below 0.007% and B less than 0.0003%, and particle diameter is the above M of 1 μ

    m 23C 6The number that is the per unit area of precipitate (M is a metallic element) is 0.1/mm 2Below, Ceq=

    C+(Mn/6)+(Cr+Mo+V)/5....(1)Wherein, C, Mn, Cr, Mo and the V in (1) formula is meant the amount (quality %) of each element.

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