COPPER PLATED STEEL SHEET FOR DOUBLY WOUND PIPE EXCELLENT IN COPPER INTERSTITION RESISTANCE OR THE LIKE AND ITS PRODUCTION

摘要

PROBLEM TO BE SOLVED: To produce a copper plated steel sheet excellent in copper interstition resistance or the like and used for producing a doubly wound pipe and to provide a method for producing it. ;SOLUTION: This copper plated steel sheet is composed of a base steel sheet composed of 0.03 to 0.08%, C, ≤0.1% Si, 0.05 to 0.5% Mn, ≤0.020% P, ≤0.015% S, 0.03 to 0.08% sol.Al, 0.003 to 0.008%. N, 0.0008 to 0.002% B, and the balance substantial Fe with inevitable impurities and a plating layer covering the surface. This copper plated steel sheet can be produced by subjecting a slab having the above chemical compsn. to hot rolling, subjecting it to cold rolling at 40 to 90% draft, thereafter subjecting the cold rolled steel sheet to annealing treatment in the temp. range of the recrystallization temp. to 850°C in a gaseous mixture of N₂-H₂, with ≥2 vol.% hydrogen concn. and subsequently executing copper plating treatment.;COPYRIGHT: (C)1999,JPO