| 摘要 |
A process for forming a relatively thick-walled hollow bar by hot rolling an elongate member including the steps: (i) in at least one pass, rolling the elongate member so as to generally define at least two longitudinally extending portions of the hollow bar; (ii) in at least one pass, bending the resultant rolled member from (i) so as to bring outer edges of the elongate member into proximity with each other. After step (i) the resultant portions are interconnected at a longitudinal region of bar material that is formed so as not to act as a hinge during bending step (ii).
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