| 摘要 |
Provided is a seamless steel tube for fuel injection with high strength and good internal pressure fatigue resistance. The seamless steel tube has a particular composition and has a structure with an average prior ³ grain size of 150 µm or less in an axial cross-section after cold drawing and heat treatment. This structure retards the growth of a fatigue crack. The steel tube has a tensile strength TS of 500 MPa or more and good internal pressure fatigue resistance and is suitable for use as a fuel injection tube under high injection pressures. The composition of the steel tube may further contain at least one of Cu, Ni, Cr, Mo, and B; at least one of Ti, Nb, and V; and/or Ca. |
