| 简介 |
PROBLEM TO BE SOLVED : To provide an electroseamed steel pipe which has damping property and is excellent in the workability of the electroseamed weld zone, and to provide its production method.
SOLUTION : A steel comprising, by mass, ≤0.02% C, 0.1 to 3.5% Si, 0.01 to 2.5 Mn, ≤0.010% P, ≤0.005% S, 0.1 to 3.5% Cr, 0.02 to 1.5% Al and ≤0.006% N, satisfying the following inequality 1, and, if required, further comprising Cu, Ni, Mo, Nb, V, Ti, B, Ca, Mg and rare earth metals, and the balance Fe with inevitable impurities is hot-rolled at a finishing temperature of >850°C into an electroseamed steel pipe, and annealing is performed at 600 to 950°C. The inequality 1 is 2×mass%Si+mass%Al+mass%Cr≤7.5. |
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