| 摘要 |
PURPOSE:To obtain spring grade steel excellent in free cutting property, by containing C, Si, Mn, Cr, Si, Te and Al, V and Nb in a predetermined ratio. CONSTITUTION:Free cutting spring grade steel consists of, on a wt. basis, 0.4- 0.75% C, 1-2.5% Si, 0.5-1% Mn, 0.1-1% Cr, S<=0.4% and Te<=0.16% and further additionally contains 0.01-0.1% Al, 0.03-0.3% V and 0.01-0.3% Nb and the ratio of Te/S thereof is limited to 0.04-0.4. This steel is excellent in free cutting property.
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