| 摘要 |
<p>A steel wire for a heat-resistant spring, which comprises, in mass %, 0.01 to 0.08 % of C, 0.18 to 0.25 % of N, 0.5 to 4.0 % of Mn, 16 to 20 % of Cr, 8.0 to 10.5 % of Ni, one or more selected from the group consisting of 0.1 of 3.0 % of Mo, 0.1 to 2.0 % of Nb, 0.1 to 2.0 % of Ti and 0.3 to 2.0 % of Si, and the balanced amount of Fe and inevitable impurities, and which exhibits a tensile strength of 1300 N/mm2 and less than 2000 N/mm2 before low temperature annealing and a maximum grain size in a Ϝ phase (austenite) of a cross section of less than 12 μm. The steel wire for a heat-resistant spring is a high strength steel wire which is excellent in high temperature tensile strength and high temperature resistance to permanent set in fatigue, at a high temperature region of 350 to 500˚C especially around 400˚C.</p> |
