| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface treated steel sheet which has high performance as a base steel sheet for an organic coated steel sheet, does not contaminate a roll in an organic coating line, and can be easily and inexpensively manufactured. SOLUTION: This surface treated steel sheet has a chromate film on the surface of the zinc-base plated steel sheet, which contains dry SiO<SB>2</SB>and a water- soluble organic resin, and Cr in a coating mass of 10-100 mg/m<SP>2</SP>, and which makes a mass ratio of dry SiO<SB>2</SB>to Cr therein satisfy 2≤[dry SiO<SB>2</SB>]/[Cr]≤6, and a mass ratio of the dry SiO<SB>2</SB>to the water-soluble organic resin therein satisfy 1≤[dry SiO<SB>2</SB>]/[water-soluble organic resin]≤10. COPYRIGHT: (C)2003,JPO
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