| 摘要 |
A lightweight hollow member having excellent rigidity and collision characteristics, the hollow member being suitable for an automotive part because of having high tensile strength equal to or higher than, for example, 780 MPa and a complex shape. A hollow member (11) provided with a steel hollow body (14). The body (14) consists of a single part at least in the longitudinal direction. The body (14) has a flat cross-section at least having portions where the body (14) has the largest outer dimension (L1) and portions where the body (14) has an outer dimension (L2) less than the largest outer dimension (L1). The body (14) has a twisted section at a portion in the longitudinal direction of the body (14). An imaginary plane (15a) which includes the largest outer dimension (L1) in a first portion (15) located on one side of the twisted section (17) in the longitudinal direction of the body (14), and an imaginary plane (16a) which includes the largest outer dimension (L1) in a second portion (16) located on the other side of the twisted section (17) in the longitudinal direction of the body (14) intersect each other at an angle equal to or greater than 4 degrees. Also, the twisted section (17) has tensile strength of at least 780 MPa. |
