| 摘要 |
A spring steel containing SiO2, Al2O3, CaO, and MgO as oxide type inclusions, which have an average composition (by weight) of 35%<=SiO2<=75%, 5%<=Al2O3<=30%, 10%<=CaO<=50%, and MgO<=5% (excluding 0%). This spring steel is superior in fatigue properties.
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