Abrasion resistant steel plate having excellent low-temperature toughness and hydrogen embrittlement resistance and method for manufacturing the same

  • US 10,253,385 B2
  • Filed: 03/19/2014
  • Issued: 04/09/2019
  • Est. Priority Date: 03/28/2013
  • Status: Active Grant
First Claim
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1. An abrasion resistant steel plate with hydrogen embrittlement resistance comprising:

  • C;

    0.20 to 0.30%, by mass %;

    Si;

    0.05 to 0.5%, by mass %;

    Mn;

    0.5 to 1.5%, by mass %;

    Cr;

    0.05 to 1.20%, by mass %;

    Nb;

    0.01 to 0.08%, by mass %;

    B;

    0.0005 to 0.003%, by mass %;

    Al;

    0.01 to 0.08%, by mass %;

    N;

    0.0005 to 0.008%, by mass %;

    P;

    not more than 0.05%, by mass %;

    S;

    not more than 0.005%, by mass %;

    O;

    not more than 0.008%, by mass %; and

    remaining Fe and unavoidable inevitable impurities as a balance,wherein;

    the steel plate includes fine precipitates that are 50 nm or less in diameter and that have a density of 50 or more particles per 100 μ

    m2,the steel plate has a lath martensitic structure from the surface of the steel plate to at least a depth of ¼

    of the plate thickness, the lath martensitic structure having an average grain size of not more than 20 μ

    m such that the average grain size is the average grain size of crystal grains surrounded by high-angle grain boundaries having an orientation difference of 15°

    or more, andthe steel plate has a Brinell hardness (HBW10/3000) of 401 or more.

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