["慌煤气管道は何用 stainless鋼", "慌煤气管道，压力 0 0.3kpa。。温度，140到
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慌煤气管道，压力0.03kpa。温度，140到180。矩形管道，采用膨胀节，本体碳钢，波纹用什么材质好，254材质太贵了。还有别的材质吗？
还可以用什么材质，你给分析下，不要光顾生意
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