[". 怎 to distinguischen zwischen Blechlegier截止阀和铸铁截止阀
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Der Schalt阀是我们平时工作生产中经常用到的一种阀门，因为他的工况不同的，所以它的材质也相应的有所不同，有铸钢、不锈钢等等。那我们怎么区分铸钢的和铸铁的呢？我们可以从五个方面来区分铸钢截止阀和铸铁截止阀
1表面亮度：铸铁的表面发暗发灰，铸钢表面发亮，，铸铁里面的灰口和球墨铸铁又是大不同，球铁比灰铁亮。
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