Thick high strength steel plate having excellent low temperature toughness in welding heat affected zone caused by high heat input welding

Thick high strength steel plate having excellent low temperature toughness in welding heat affected zone caused by high heat input welding

  • CN 1,946,862 B
  • Filed: 04/06/2005
  • Issued: 08/29/2012
  • Est. Priority Date: 04/07/2004
  • Status: Active Grant
First Claim
Patent Images

1. the high tensile steel plate of thickness of slab 50~

  • 80mm that the low-temperature flexibility of the welded heat affecting zone of a large-line energy welding is excellent;

    It is characterized in that;

    % representes with quality, contain below the C;

    0.03-0.14%, Si;

    0.30%, Mn;

    0.8-2.0%, below the P;

    0.02%, below the S;

    0.004%, Al;

    0.001-0.040%, N;

    0.0010-0.0100%, Ni;

    0.8-4.0%, Ti;

    0.005-0.030%, Nb;

    0.003-0.040%, and carbon equivalent Ceq% satisfies 0.36~

    0.42%;

    And then satisfy Ni/Mn >

    =10 * Ceq-3;

    Wherein, Ceq%=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15, its surplus is iron and unavoidable impurities.

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