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 105,838,992 A
  • Filed: 02/12/2010
  • Published: 08/10/2016
  • Est. Priority Date: 02/12/2009
  • Status: Active Application
First Claim
Patent Images

1. the effective steel plate of high-strength line-pipe that a hydrogen-induced cracking resistance is excellent, it is characterised in that with matterAmount % meter, 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 limited to;

    Below P;

    0.01%,Below S;

    0.0020%,Below Al;

    0.030%,Below Ti;

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

    0.5,Its surplus is made up of Fe and inevitable impurity element,Further, the length of the non-nip portion in center segregation portion is limited in below 0.1mm.

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