| 摘要 |
The invention deals with a hot-dip galvanized or galvannealed steel sheet wherein, the composition of the steel sheet comprises, by weight: 0.01≦̸C≦̸0.22%, 0.50≦̸Mn≦̸2.0%, 0.2≦̸Si≦̸3.0%, 0.005≦̸Al≦̸2.0%, Mo<1.0%, Cr≦̸1.0%, P<0.02%, Ti≦̸0.20%, V≦̸0.40%, Ni≦̸1.0%, Nb≦̸0.20%, the balance of the composition being iron and unavoidable impurities resulting from the smelting, and the steel sheet comprises a layer of an internal nitride of at least one type of nitride selected from a Si nitride, Mn nitride, Al nitride, complex nitride comprising Si and Mn, or Al and Si, or Al and Mn, or complex nitride comprising Si, Mn and Al, said steel sheet comprising no further outer layer of iron nitride.
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