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防盗球墨铸铁井盖 buy in Cangzhou
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防盗球墨铸铁井盖

防盗球墨铸铁井盖

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China, Cangzhou
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球墨铸铁强度高、韧性好,因此球墨铸井盖比同类型灰口铸铁井盖轻30%左右。球墨铸铁牌号采用QT500-7,铁水出炉温度不低于1456℃,在球化处理时增配稀土硅铁镁合金和选用含硫量低的焦碳,球化级别达三级以上。
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防盗球墨铸铁井盖
防盗球墨铸铁井盖
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