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采用正交试验对球铁等温淬火的四个工艺因素进行了研究，说明等温淬火工艺合适的奥氏体贝氏体球铁具有好的综合机械性能和高的疲劳强度，是一种优良材料。
Orthogonal test was used to study the four process factors of isothermal quenching of ductile iron. It is shown that austenitic bainitic ductile iron with suitable isothermal quenching process has good mechanical properties and high fatigue strength. It is an excellent material.