Nodular cast iron crank shaft which has not been processed by adding nitrogen, its surface fatigue strength is lower, this is the reason that results in the fracture.

球墨铸铁曲轴未经过氮化处理，表面疲劳强度低是导致曲轴断裂的原因；

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Nodular cast iron crank shaft which has not been processed by adding nitrogen, its surface fatigue strength is lower, this is the reason that results in the fracture.

球墨铸铁曲轴未经过氮化处理，表面疲劳强度低是导致曲轴断裂的原因；

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