Structural material

摘要

A structural material is provided, the strength and toughness of which are well-balanced at a high level, suitable in particular for seat frames in automobiles, aircrafts and the like. Specifically disclosed is a structural material produced by integrally joining thin steel members in a part thereof and, after joining, thermally heating a part thereof so that the heat-treated part differs from the other parts in strength and toughness. Unlike a structural material, the strength of which as a whole has been uniformly improved by heat treatment, the above-described structural material consists of a part having a high strength and a part having low strength. Thus, a structural material, the strength and toughness of which are well-balanced at a high level can be obtained. Since the strength and toughness are well-balanced at a high level, the structural material is suitable particularly for seat frames in automobiles, aircrafts and the like.

主权项

1. A structural material in a frame member for a seat, the structural member using thin steel obtained by joining and integrating thin steel members in a part thereof, comprising:
a reinforced portion formed of a bead, a bracket or a combination of the bead and the bracket provided in the thin steel, wherein heat treatment is applied to a part thereof after the joining, and by this heat treatment, two types or more of metal structures with different strength and toughness are formed in the thin steel, wherein the shape of a transmission path of force formed by the reinforced portion and a portion with hardness higher than a raw material state portion formed by the heat treatment, is formed to be a substantially truss shape, both prior to, and during, the application of the force, wherein the thin steel is used as a side frame for a seat; the reinforced portion and the heat-treated portion are provided so that the transmission path of the force, having the substantially truss shape, is formed at least at one spot in the side frame; and a seat belt anchor provided at the at least one spot in the side frame.