Hot-rolled steel sheet for high-strength hot-dip galvanized steel sheet or high-strength alloyed hot-dip galvanized steel sheet, and process for producing same

Hot-rolled steel sheet for high-strength hot-dip galvanized steel sheet or high-strength alloyed hot-dip galvanized steel sheet, and process for producing same

  • CN 103,946,409 A
  • Filed: 11/02/2012
  • Published: 07/23/2014
  • Est. Priority Date: 11/17/2011
  • Status: Active Application
First Claim
Patent Images

1. for a hot-rolled steel sheet for high-strength hot-dip zinc-coated steel sheet or high strength alloyed hot-dip zinc-coated steel plate, it is characterized in that,Having following one-tenth is grouped into:

  • contain below C;

    0.04~

    0.20 quality %, Si;

    0.7~

    2.3 quality %, Mn;

    0.8~

    2.8 quality %, P;

    0.1 quality %, below S;

    0.01 quality %, below Al;

    0.1 quality %, below N;

    0.008 quality %, surplus is made up of Fe and inevitable impurityIn the crystal boundary of base steel and crystal grain, exist and contain the subscale that is selected from more than one elements in Si, Mn, Fe, wherein, the subscale of base steel crystal boundary is present in steel substrate surface 5 μ

    m, and the difference of the formation degree of depth of subscale in steel plate width direction is in 2 μ

    m.

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