| 简介 |
PROBLEM TO BE SOLVED : To provide a steel, a steel sheet pile, a steel pipe sheet pile, a steel pipe stake, a steel sheet pile wall, and a steel pipe sheet pile wall, having sufficient corrosion resistance.
SOLUTION : Provided is the steel for which a corrosion resistant part and a carbon steel part are connected in a longitudinal direction, wherein the corrosion resistant part is composed of a high corrosion resistance steel prescribed in the following, and also provided are the steel sheet pipe, steel pipe sheet pile, steel pipe stake, steel sheet pile wall and steel pipe sheet pile wall. The high corrosion resistance steel contains, by mass, 0.001 to 0.15% C, ≤2.5% Si, >0.5 to 2.5% Mn, <0.03% P, ≤0.005% S, <0.2% Cu, <0.2% Ni, 0.01 to 3.0% Cr, 0.003 to 0.1% Al, 0.001 to 0.1% N and 0.03 to 0.50% Sn, and the balance Fe with impurities, wherein a Cu/Sn ratio is ≤1. Further, the high corrosion resistance steel may contain one or more selected from among Ti, Nb, Mo, W, V, Ca, Mg and rare earth metals.
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