| 摘要 |
PURPOSE:To attain to enhance the strength and corrosion resistance of the titled steel, by containing C, Si, Mn, Cr, Cu and Fe in a predetermined ratio while limiting the contents of impurities, i.e. O and S. CONSTITUTION:The titled spring grade steel comprises, on a wt. basis, 0.4- 0.75% C, 1-0.2% Si, 0.5-1% Mn, 0.1-1% Cr, 0.35-3% Cu and the remainder of Fe and impurites containing S and O and is limited to S<=0.01% and O<=0.0015% in the contents of S and O. This spring grade spring has high strength and is excellent in corrosion resistance and weather resistance and suitably used as the suspension spring material of an automobile.
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