| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for easily and stably producing a high strength hot rolled steel sheet excellent in chemical convertibility.SOLUTION: The method for producing a hot rolled steel sheet comprises: performing first pickling on a hot rolled steel sheet using an acid liquid having a hydrochloric acid concentration of 4.0-15 mass% and a temperature of 50-90°C; and performing second pickling using an acid liquid having a divalent Fe-ion concentration of 3.0 mass% or less. It is preferred that the second pickling is performed by using the acid liquid having a hydrochloric acid concentration of 0.5-15 mass% and a temperature of 30-90°C, and the pickling time is 1-20 seconds. The hot rolled steel sheet preferably includes Si of 0.5-3.0 mass%. |
