STEEL PLATE MATERIAL, METHOD FOR PRODUCING SAME AND DEVICE FOR PRODUCING SAME, AND METHOD FOR PRODUCING PRESS MOLDED ARTICLE USING SAID STEEL PLATE MATERIAL.

摘要

This steel plate material (11) is plate-shaped, and is used in the production of a press-molded article having an open cross-section containing a bent section. The steel plate material (11) is provided with a band-shaped thick region (12) that is singular across all regions and has an increased thickness, and thin regions (13A, 13B) having a thinner thickness than that of the thick region (12) and that neighbor the thick region (12) on both sides. Of the obverse surface (11a) and reverse surface (11b) of the steel plate material (11), a thickness step (12a) is formed along one side among the two sides of the thick region (12) at the obverse surface (11a), and a thickness step (12b) is formed along the other side among the two sides of the thick region (12) at the reverse surface (11b). By means of using the steel plate material (11) in the production of a press-molded article, it is possible to optimize the strength of the press-molded article and it is possible to suppress production cost.