| 摘要 |
PURPOSE:To obtain a cold rolled steel sheet having superior corrosion resistance after coating by forming a proper amount of an iron layer on the surface of a cold rolled steel sheet contg. specified amounts of C, Si, Mn, Nb and Ti. CONSTITUTION:A cold rolled steel sheet contg., by weight, 0.08-0.15% C, 0.1- 1.0% Si, 0.5-3.0% Mn and Nb satisfying Nb/C>2 and/or Ti satisfying Ti/C>2 is well cleaned by electrolytic cleaning or other method, and an iron layer is formed on the surface of the steel sheet by 20-1,500mg/m<2> by electroplating, the application of a compound, vapor deposition or other method. The suitability of the steel sheet to phosphating is improved without deteriorating the corrosion resistance, so a cold rolled steel sheet having superior corrosion resistance after coating is obtd.
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