以下为句子列表：
英文: Abstract: In this paper，the essential chemical composition on the spheroidized quality of small-sized ductile iron pipes have been investigated，and the degeneration of spheroidal graphite in ductile iron pipe was analyzed，under practical manufacturing con
中文: 文摘:在实际生产的条件下，研究了小口径球墨铸铁管在球化后主要化学成分的分布和变化对铸态球化效果的影响，并对铸管存在的球化衰退进行了分析；根据试验结果，提出了对成分及工艺条件进一步的改进措施。
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英文: Grooved butterfly valves direct connect to pipe using iron pipe size couplings. Grooved valves are easiest to install.
中文: 管状蝶阀：采用铸铁管接头直接与管道连接。管状阀门安装最容易。
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英文: We are professional on malleable iron pipe fittings. They are used for joining pipes lines of water,steam,gas,oil and etc.
中文: 我们是一家专业生产玛钢管件的公司.玛钢管子零件应用于供水管道、水蒸气管道、煤气管道、输油管道的连接。
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英文: We find that the cast-iron pipe is only mildly corrosive and the indoor pipeline is just rust-eaten, but the seamless steel pipe corrodes badly.
中文: 结果表明：主干线灰口铸铁管整体状况良好，只有局部轻度腐蚀；庭院无缝钢管腐蚀较严重；户内管道大多存在不同程度的锈蚀。
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