| 摘要 |
PROBLEM TO BE SOLVED: To produce an electric resistance welded tube excellent in workability and to provide a method for producing the same. SOLUTION: This electric resistance welded tube excellent in workability has a compsn. contg., by weight, <=0.08% C, 0.005 to 0.5% Si, 0.05 to 2.0% Mn, <=0.03% S, 0.01 to 0.2% P, 0.01 to 0.10% Al and <=0.0050% N, moreover contg. one or∞two kinds among Cr, Ni, Cu, Mo, V, Ti, Nb, B and Ca, and the balance iron with inevitable impurities and having a texture of a ferritic single phase. The A value shown in the formula: A=ln(C0/C)÷ln(C×L/ C0×L0)(where C0 and C denote the outer circumferences (mm) of the steel tube before and after the testing, and L0 and L denote the distance (mm) between gauge marks in the longitudinal direction at each circumferential position of the steel tube before and after the testing) is >=1.0, and the difference in hardness between the electric resistance weld zone and the base metal part is <=50 Hv.
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