Patent ID: 7846274

Claim:
A steel pipe for an air bag having excellent bursting resistance, characterized in that the pipe has a steel composition, in mass %, of: C: 0.05-0.14%, Si: 0.1-1.0%, Mn: 0.20-2.0%, P: at most 0.025%, S: at most 0.005%, Cr: 0.05-1.0%, Al: at most 0.10%, Mo: 0-0.50%, Ni: 0-1.5%, B: 0-0.005%, Cu: 0-0.5%, Ti: 0-0.1%, Nb: 0-0.1%, V: 0-0.2%, Ca: 0-0.01%, Mg: 0-0.01%, REM (rare earth elements): 0-0.01%, and a remainder of Fe and impurities, the steel pipe having a quenched and tempered structure, a tensile strength of 900 MPa or higher, a low temperature toughness of vTrs 100 of −40° C. or less, and a bursting resistance such that no crack propagation occurs to either end of the pipe when the pipe is subjected to bursting at −40° C., wherein an L/T ratio of an X-ray integrated intensity ratio of the {110} plane in a plane perpendicular to an axial direction L of the steel pipe to that in a plane perpendicular to a circumferential direction T of the steel pipe is at most 4.