针对钢球表面易产生擦伤，影响钢球精度等原因，采用表面强化处理的方式提高钢球表面质量，降低振动值，提高疲劳寿命。
Based on this, the steel ball surface quality is increased by the means of surface handling, then the vibration value is reduced, the fatigue life is raised.
研究了三种钢在缓冷法球化处理中残留碳化物对球化的影响。
The effects of residual carbides on the carbide spheroidizing during the slow-cooling spheroidizing annealing were investigated in three steels.
C4钢球芯、阀座均采用特殊硬化处理，密封面不易擦伤。
The ball and seat made of C4 are treated by special harden process, so they are hard to be scratched.
C4钢球芯、阀座均采用特殊硬化处理，密封面不易擦伤。
The ball and seat made of C4 are treated by special harden process, so they are hard to be scratched.
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