Patent ID: 8635835

Claim:
An automotive part having a hollow metal body, wherein the body is constituted by a single member at least in the lengthwise direction, the body has a flat cross section having at least a portion with a maximum outer dimension and a portion with an outer dimension shorter than the maximum outer dimension, the body has a hot-twisted portion and a non-twisted portion in a portion of its length, the hot-twisted portion having a distribution of a martensitic transformation, the angle of intersection between an imaginary plane including a portion having the maximum outer dimension in a first portion present on one side in the lengthwise direction of the body with the hot-twisted portion as a border and an imaginary plane including a portion with the maximum outer dimension in a second portion present on the other side in the lengthwise direction of the body with the hot-twisted portion as a border is not zero degrees, and the hot-twisted portion is made of steel and has a tensile strength of at least 780 MPa, wherein the ratio of the maximum outer dimension/the shorter outer dimension is at least 1.2 and the angle of intersection is at least 4 degrees; wherein the automotive part is one that requires bending stiffness when used in an automobile.