| 摘要 |
A high-toughness, quenched, oil-tempered wire for springs which is less likely to suffer a permanent set and is high in strength and toughness. The wire is made of a steel containing predetermined amounts of C, Si, Mn, Al and Ti, to which are selectively added predetermined amounts of V, Mo, W and Nb. After quenching and tempering, the content of retained austenite is 1-5 vol. %, and/or the number of carbides having a diameter of 0.05 mu m or more is 5 or less per mu m2 as viewed on a transmission electron microscope image. |
