TH163465B - Hot-dip coated steel plates with a Zn-Al-Mg-based system capable of In excellent performance and methods for producing the same - Google Patents

Abstract

The purpose of this invention is to provide a hot dip coated steel sheet with a Zn-Al-Mg-based system that offers rigidity, flattenability and capability. The expansion of the holes is suitable for various processes such as stamping, forming and fabrication. Extended overhang And which is highly resistant to corrosion as well Invention involves High-strength steel plates coated with a hot-dip coating with a Zn-Al-Mg-based system and have a tensile strength of 400 MPa or more and excellent workability. A predetermined chemical composition; The equivalent ratio between Ti / C represented by formula (1) below is 0.4 to 1.5; There is a single phase of the benite ferrite or the composite phase. Included with the benite phase and the ferrite phase being the primary phase; Ratio of area of The second solid phase and the cementite are 3% or less; the ratio of the low-angle boundaries with the difference. The direction of crystal orientation is 2 ํ 15 ํ. The value is 30% to 75%; And Ti containing carbides with an average particle size of 20 nm or less were dispersed and precipitated.

Claims (1)

1. High-strength steel plates coated with a hot-dip coating with Zn-Al-Mg primarily and having a tensile strength of 400 MPa or more and the excellent workability that steel plates offer. Hot dip coated layer with Zn-Al-Mg system primarily on the surface of the steel plate material where the steel plate material This represents a percent by mass and has C.