Seamless steel pipe for line pipe and method for producing same

Seamless steel pipe for line pipe and method for producing same

  • CN 101,287,852 A
  • Filed: 08/22/2006
  • Published: 10/15/2008
  • Est. Priority Date: 08/22/2005
  • Status: Active Application
First Claim
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1. the seamless steel pipe for line pipe of a low temperature excellent in resistance to sulfide stress cracking, it is characterized in that, has following chemical constitution, wherein, contain C:

  • 0.03~

    0.08% in quality %, Si;

    0.05%~

    0.5%, Mn;

    1.0~

    3.0%, Mo;

    0.4%~

    1.2% but do not contain 0.4%, Al;

    0.005~

    0.100%, Ca;

    0.001~

    0.005%, Cr;

    0~

    1.0%, Nb;

    0~

    0.1%, Ti;

    0~

    0.1%, Zr;

    0~

    0.1%, Ni;

    0~

    2.0%, V;

    0~

    0.2%, B;

    0~

    0.005%, surplus;

    constitute by Fe and impurity, N in the impurity is below 0.01%, P is below 0.05%, S is below 0.01%, O is below 0.01%, Cu is below 0.1%, and, yield strength is more than the 80ksi, and DCB test method(s) according to NACE TM0177-2005 method D defined, when in 4 ℃

    of environment, testing, the stress sampling factor K that calculates ISSCBe 20.1ksi In. more than.

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