Hot Rolled Steel Sheet

Abstract: Disclosed is a hot-rolled steel sheet that excels in a balance between strength, elongation, and hole expandability, and that also excels in a collision characteristic. The hot-rolled steel sheet according to the present disclosure has a specified chemical composition, and: has a prior austenite grain size of 25 µm or less; has an area ratio of a region having a GAM value greater than 0.6° and less than 2.0° of 50% or greater, and less than 100%; has an area ratio of a region having a GAM value of 0.6° or less of 0% or greater and less than 50%; has an area ratio of a region having a GAM value of 2.0° or greater of greater than 0% and 50% or less; and satisfies the relationships 1.7=LGr/LGt and 1.20=(LGr/LGt)/(LMr/LMt). Here, LGr is the area average value for the rolling-direction projection length of the prior austenite grains, LGt is the area average value for the sheet-thickness-direction projection length of the prior austenite grains, LMr is the area average value for the rolling-direction projection length of the region having the GAM value of 2.0° or greater, and LMt is the area average value for the sheet-thickness-direction projection length of the region having the GAM value of 2.0° or greater.

Patent Information

Applicants

Inventors

Specification

Documents

Application Documents