| 摘要 |
PROBLEM TO BE SOLVED: To provide a copper plated steel sheet used for manufacture of a double roll pipe and excellent in copper penetration resistance, grain coarsening resistance, workability, etc., and its production. SOLUTION: This copper plated steel sheet is constituted by applying copper plating to a steel sheet which has a chemical composition consisting of 0.03-0.08% C, <=0.1% Si, 0.05-0.5% Mn, <=0.020% P, <=0.015% S, 0.03-0.08% sol. Al, 0.003-0.008% N, 0.0008-0.002% B, and the balance essentially Fe and where fine AlN precipitates are densely dispersed in the surface layer (20 to 100μm layer thickness). This copper plated steel sheet can be produced by applying cold rolling to a hot rolled steel plate of a slab having the above chemical composition at 40 to 90% draft, subjecting the resultant cold rolled steel sheet to annealing treatment in the temp. region between the recrystallization temp. and 850 deg.C in an N2 -H2 gaseous mixture of >=2 vol.% hydrogen concentration, and then applying copper plating to the steel sheet.
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