| 摘要 |
<p>A steel for a spring which has a chemical composition, in mass %: C: 0.5 to 0.8 %, Si: 1.2 to 2.5 %, Mn: 0.2 to 1,5 %, Cr: 1.0 to 4.0 %, V: 0.5 % or less (including 0 %), P: 0.02 % or less (excluding 0 %), S: 0.0 2 % or less (excluding 0 %), Al: 0.0 5 % or less (excluding 0 %), and the balance: Fe and inevitable impurities, with the proviso that the above Si content and Cr content further satisfy the following formula (1): 0.8 X [Si] + [Cr] >= 2.6 --- (1) wherein [Si] and [Cr] represent a Si content (mass %) and a Cr content (mass %), respectively. The steel for a spring can be suitably used for improving both of the resistance to setting and fatigue characteristics</p> |
