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分析了高应力条件下弹簧疲劳断裂的主要原因以及用稀土控制弹簧钢夹杂物形态的局限性。指出了ＭｎＯ－Ａｌ２Ｏ３－ＳｉＯ２或ＣａＯ－Ａｌ２Ｏ３－ＳｉＯ２三元塑性夹杂物的成分范围，并以６０Ｓｉ２ＣｒＶＡ为例确定与之相平衡的钢液脱氧条件，提出了相应的工艺措施。
The main reason of spring fatigue fracture under high stress and the limitation of controlling rare earth inclusions in spring steel are analyzed. The composition range of the ternary plastic inclusions of MnO-Al2O3-SiO2 or CaO-Al2O3-SiO2 is pointed out. The 60Si2CrVA is taken as an example to determine the conditions of the molten steel deoxidation, and the corresponding technological measures are put forward.