| 摘要 |
PROBLEM TO BE SOLVED: To provide a hot rolled steel plate excellent in scale adhesion property without increasing the cost, and a method for manufacturing the same.SOLUTION: A hot rolled steel plate contains, by mass%, C:0.01 to 0.4%, Si:0.001 to 2.0%, Mn:0.01 to 3.0%, P:0.05% or less, S:0.05% or less, Al:0.3% or less, N:0.01% or less and the balance Fe with inevitable impurities, and has a thickness of scale formed on a surface of the steel plate of 20 μm or less, a ratio of a contact length with a ferrite of the steel plate and magnetite to the contact length with the ferrite and scale in the rolling direction of 80% or more and an average particle diameter of magnetite of 3 μm or less. |
