| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a slurry transporting steel tube having a long service life by improving wear resistance against slurry being transported. SOLUTION: A flange 3 which is integrated to a tube body by wall thickening by hot upsetting is formed in the tube end part of a steel tube 2 having the shape of a straight tubular or curved tubular part, whereby joining by welding is unnecessitated, the generation of a softened part caused by a heat effect at the time of welding is eliminated, and further hardening for the inner surface is applied to the whole length of the tube. Thus, slurry transporting steel tubes 1A, 1B, wear resistance in the whole inner surfaces of which is improved, are obtained.</p> |
