High-strength steel sheet and high-strength steel pipe having excellent hydrogen-induced cracking resistance for use in line pipe

High-strength steel sheet and high-strength steel pipe having excellent hydrogen-induced cracking resistance for use in line pipe

  • CN 102,317,491 A
  • Filed: 02/12/2010
  • Published: 01/11/2012
  • Est. Priority Date: 02/12/2009
  • Status: Active Application
First Claim
Patent Images

1. the effective steel plate of high-strength line-pipe that hydrogen-induced cracking resistance is excellent is characterized in that, in quality %, contains:

  • C:

    0.02~

    0.08%



    Si:

    0.01~

    0.5%



    Mn:

    1.0~

    1.6%



    Nb:

    0.001~

    0.10%



    Ca:

    0.0001~

    0.0050%



    N:

    0.0010~

    0.0050%



    O:

    0.0001~

    0.0030%



    And be restricted to;

    Below the P;

    0.01%,Below the S;

    0.0020%,Below the Al;

    0.030%,Below the Ti;

    0.030%,The content of S, Ca satisfies S/Ca<

    0.5,Its surplus is made up of Fe and unavoidable impurities element,And the limitation of length of the not pressing portion of center segregation portion is below 0.1mm.

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