| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method for producing a high Si cold rolled steel sheet having satisfactory chemical convertibility and a tensile strength of 590 MPa or higher without checking its productivity regarding a high Si cold rolled steel sheet comprising Si of 0.6% or higher.SOLUTION: Provided is a method for producing a high Si cold rolled steel sheet where a steel sheet comprising 0.6 to 3.0 mass% Si and subjected to continuous annealing after cold rolling is ground in such a manner that the ground area ratio reaches 40% or higher, and is thereafter pickled using a mixed solution of nitric acid and hydrochloric acid in which the nitric acid concentration and the hydrochloric acid concentration are respectively 10 to 150 g/L, and also, the total of the nitric acid concentration and the hydrochloric acid is 50 to 250 g/L.</p> |
