| 摘要 |
Disclosed is a concrete slurry transporting pipe for concrete pump-cars, which has improved wear resistance to friction with sands or gravels and impact resistance during transportation of concrete slurry. The pipe is a steel pipe made of carbon steel, and includes a heat-treated section having a hardness of Hv 450 or more and formed by induction-heating a portion of an inner or outer surface of the pipe, followed by cooling the heated portion of the inner or outer surface to harden the heated portion, and a non-heat treated section adjoining the heat-treated section. The heat-treated section and the non-heat treated section are alternately formed in a spiral band arrangement along a length of the pipe, and the heat-treated section has a greater width than the non-heat treated section.
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