Patent ID: 7749339
Filing Date: 2010-07-06
Classification: B60R,C22C,Y10S

Abstract:
1. A process for manufacturing an airbag inflator bottle member comprising a tubular body including opposing end portions of the tubular body, one or both of the end portions having a reduced-diameter, comprising performing cold working on a steel tube having a steel composition which consists essentially of, in mass percent, C: 0.05-0.20%, Si: 0.1-1.0%, Mn: 0.10-2.0%, Cr: 0.05-2.0%, sol. Al: at most 0.10%, Ca: at most 0.01%, Cu: 0-1.0%, Ni: 0-1.5%, Mo: 0-1.0%, V: 0-0.2%, Nb: 0-0.1%, Ti: 0-0.1%, and remainder of Fe and unavoidable impurities, with the contents of impurities being at most 0.025% for P and at most 0.010% for S, cutting the cold worked steel tube to a length of the airbag inflator bottle member, reducing the diameter at one or both end portions of the cut steel tube such that a non-reduced portion of the steel tube remains, and subjecting the steel tube to quenching and tempering such that the tensile strength of the non-reduced portion is at least 700 MPa.