如何选择球墨铸铁井盖尺寸 球墨铸铁井盖的尺寸规格是多少？
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2、铸铁井盖：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。
绛旓細9--12姣背锛屽弬鐓97S501鍥鹃泦銆
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