| 摘要 |
<p>The present invention provides hot dip plated high strength steel sheet for press forming use having a tensile strength of 380 MPa to less than 540 MPa, having a press formability able to be used for the automobile field, in particular fuel tank applications, and having superior secondary work embrittlement resistance and superior seam weld zone low temperature toughness and further superior plateability and a method of production of the same and provides
hot dip plated high strength steel sheet for press forming use of the present invention having cold rolled steel sheet and a hot dip plated layer formed on the surface of said cold rolled steel sheet, characterized in that said cold rolled steel sheet contains, by mass%, C: 0.0005 to 0.0050%, Si: over 0.3 to 1.0%, Mn: 0.70 to 2.0%, P: 0.05% or less, Ti: 0.010 to 0.050%, Nb: 0.010 to 0.040%, B: 0.0005 to 0.0030%, S: 0.010% or less, Al: 0.01 to 0.30%, and N: 0.0010 to 0.01%, where the Ti content (%) is [Ti], the B content (%) is [B], and the P content (%) is [P], the TB * expressed by the following formula <A> being 0.03 to 0.06 and the following formula <B> being satisfied: TB * = 0.11 - Ti / ln B × 10000 P ‰¤ 10 × B + 0.03</p> |
