High-tension steel plate with excellent toughness at low temperature for welding heat influence part

High-tension steel plate with excellent toughness at low temperature for welding heat influence part

  • CN 1,958,827 A
  • Filed: 11/01/2006
  • Published: 05/09/2007
  • Est. Priority Date: 11/04/2005
  • Status: Active Application
First Claim
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1. steel plate is characterized in that % contains in quality:

  • C;

    0.03~

    0.07%, Si;

    0.01~

    0.25%, Mn;

    1.20~

    1.60%, P;

    0.010% following but do not contain 0%, S;

    0.003% is following but do not contain 0%, Al;

    0.02~

    0.04%, Nb;

    0.005~

    0.016%, B;

    0.0006~

    0.0020%, N;

    0.0045~

    0.0090%, and Ti;

    0.008~

    0.020%And, satisfying following formula (1), tensile strength is 440MPa,-20≤

    (B-NT/1.3)≤

    10...(1)In formula, B represents the quality ppm content of B, and NT represents the relation of N and Ti,When (N-Ti/3.4) 〉

    =0, NT=(N-Ti/3.4)When (N-Ti/3.4)<

    0, NT=0,Wherein N, Ti represent the content of N, Ti, unit;

    quality ppm.

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