Structural member for automobile, two-wheeled vehicle or railway vehicle having excellent shock absorption characteristics, shape freezing property and flange section cutting ability, and method for producing the same

摘要

The invention provides structural component for an automobile, two-wheeled vehicle or railcar excellent in impact-absorption property, shape fixability and flange cuttability, and method for producing the same, which structural component has a hat-like shape including vertical walls and flanges, wherein distal ends of the flanges contain 20 vol% or greater of austenite phase and have a cross-section hardness expressed as Vickers harness of 150 - 350, and a center regions of the vertical walls have, in a common cross-section with the flanges, a content of deformation-induced martensite phase exceeding that of the distal ends of the flanges by 10 vol% or greater and a cross-section hardness expressed as Vickers hardness that exceeds that of the distal ends of the flanges by 50 or greater.