Patent ID: 8129035
Filing Date: 2012-03-06
Classification: C21D,C22C,F16F,Y10T

Abstract:
1. A structural component for an automobile, two-wheeled vehicle or railcar excellent in impact-absorption property, shape fixability and flange cuttability that is produced by processing a steel sheet containing austenite phase and a balance of ferrite phase and/or martensite phase and unavoidable precipitated phases, which structural component is fabricated to have a hat-like shape including a top, 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 hardness of 150˜350, 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, and wherein the steel sheet comprises, in mass %, C: 0.001˜0.250%, Si: 0.01˜3.00%, Mn: 0.01˜10.00%, P: less than 0.050%, S: 0.0001˜0.0100%, Cr: 5.0˜30.0%, Ni: 0.03˜15.00%, N: 0.001˜0.300%, and a balance of Fe and unavoidable impurities.