井盖铸铁井盖分为 球墨铸铁井盖和灰铸铁井盖，一般来说，同等重量的球墨铸铁井盖要比灰铁井盖抗压能力强。灰铁井盖采用的材料一般为HT200,球墨井盖采用材料一般为QT500-7。 现将井盖样品分列如下： 铸铁井盖
质量好的铸铁井盖是要看其韧度和硬度的。
Cast iron manhole cover of good quality is to see its toughness and hardness.
在理论上说，球墨铸铁井盖在安装的时候，应该是一个整体。
In theory, ductile iron manhole cover when installed, should be a whole.
铸铁井盖主要是被应用在城市下水道中，但造成其质量问题的因素在哪些？
The main cast iron manhole cover is being applied in the sewers of the city, but the cause of quality problems in what factors?
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