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通过不同孕育训孕育的对比试验和含钛复合孕育剂的正交试验表明，RT－4和RAC孕育对提高灰铸铁性能效果明显。
The orthogonal experiment of different inoculation and inoculation with titanium inoculant showed that RT-4 and RAC inoculation had obvious effect on improving the performance of gray cast iron.