| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-strength polyurethane heavy-duty corrosionproof coated steel material with protrusions, as a steel material requiring a corrosion- preventive coating formed on the outer face, which has the high impact properties and the high peel resistance of a coating to an impact to be generated, e.g. during driving a sheet pile or a tube pile or by ripraps after driving the sheet pile or the tube pile or by other floating objects or the like including vessels. SOLUTION: A primary coat is applied to the surface of a steel material 1 with protrusions 3 jutting out larger than the thickness of an urethane coat, and a primer layer 4 and a polyurethane layer 5 are laminated in 1-6 mm thickness. Further, a 2-10 mm thick protecting coated layer 6 of an unsaturated polyester cured resin containing 10-60 wt.% glass fiber, is laminated on the entire or partial surface layer in the longitudinal direction of the steel material 1 in the order described to obtain the high-strength polyurethane heavy-duty corrosionproof coated steel material with protrusions. |
