High-strength hot-rolled steel sheet and production method thereof

High-strength hot-rolled steel sheet and production method thereof

  • CN 104,968,820 A
  • Filed: 01/23/2014
  • Published: 10/07/2015
  • Est. Priority Date: 01/31/2013
  • Status: Active Application
First Claim
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1. a high tensile hot rolled steel sheet, is characterized in that,There is following composition:

  • in mass %, contain more than C;

    0.013% in the mode making C, S, N and Ti meet following (1) formula and (2) formula and lower than 0.08%, Si;

    lower than 0.5%, Mn;

    more than 0.8% and lower than 1.2%, below P;

    0.05%, below S;

    0.005%, below N;

    0.01%, below Al;

    0.1%, more than Ti;

    0.03% and less than 0.15%, surplus is made up of Fe and inevitable impurityAnd have as undertissue;

    the percentage of ferritic phase is more than 90%, and separate out the carbide containing Ti, the particle diameter of in this carbide more than 70% is less than 9nm,0.05≤

    Ti*<

    0.1…

    (1)C×

    (48/12)-0.16<

    Ti*…

    (2)Wherein, (1) formula is with in (2) formula, and Ti*=Ti-N ×

    (48/14)-S ×

    (48/32), C, S, N, Ti are the quality % content of each element.

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