| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a high-strength steel tube for hydroforming which can obtain a hydroformed component with a desired portion thereof strengthened without any weakening by the reduction in the wall thickness caused by the hydroforming at a low cost. SOLUTION: The high-strength steel tube for hydroforming has a multiple tubular structure comprising, for example, a base tube 1 and an add-on tube 2 on a part of the overall length. The multiple tubular structure is preferably formed by at least one kind of shrink-fit, cold-fit, and press-fit. A tube constituting the multiple tubular structure is preferably laser-welded.</p> |
