| 摘要 |
PROBLEM TO BE SOLVED: To provide a high strength steel sheet suitable for a raw material for automobile components without deteriorating surface appearance.SOLUTION: There is provided an evaluation method of a surface quality of a high strength steel sheet including determining that the surface quality of the high strength steel sheet containing contents of Mn, Ca and S satisfying the following formula (1) in the high strength steel sheet containing C:0.05 to 0.35 mass%, Si:0.50 to 3.00 mass%, Mn:0.50 to 3.00 mass%, P:0.050 mass% or less, S:0.0050 mass% or less, Al:less than 0.100 mass%, Ca:0.0010 mass% or more and the balance Fe with inevitable impurities is good. (Mn×Ca)/S≤3.00 (1), where symbols of element represent contents (mass%) of each element.SELECTED DRAWING: Figure 1 |
