| 摘要 |
PROBLEM TO BE SOLVED: To suppress the formation of oxide scale when a steel tube having a zinc based coating is subjected to reduction working at a relatively high temperature, and to suppress the occurrence of plating defects at the reduction working, the sticking of plating to a reduction roll, the galling of the steel tube to the reduction roll, or the like. SOLUTION: As for the galvanized steel tube, in the region from the boundary between a Zn-Fe based coating on the surface of the steel tube and ferrite at least to a thickness of 1μm on the Zn-Fe based coating side, the concentration of Fe is 15 to 50 mass% and/or aΓphase is allowed to exist. Further, the galvanized steel tube is produced by heating a steel tube having a Zn based coating on the surface at 500 to 850°C, and subjecting the steel tube to working at a reduction ratio of 10 to 90%. COPYRIGHT: (C)2004,JPO
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