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我厂生产的T 140型推土机阀体是HT25—47铸铁件,阀体铰孔后孔壁出现分散小孔(麻点),使阀体加速磨损(见图1)。可是采用蠕墨铸铁未出现这种缺陷。且同样的灰铸铁也各有不同。对此我们做了如下试验与分析。
The T 140 bulldozer body produced by our factory is made of HT25-47 iron castings. Dispersed holes (pitting) appear on the hole wall of reaming valve body to accelerate the wear of the valve body (see Figure 1). However, the use of compacted graphite cast iron does not appear this defect. And the same gray cast iron is also different. We have done the following test and analysis.