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天津钢管集团股份有限公司
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天津钢管集团股份有限公司
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http://www.tpco.com.cn/GNJG/GGGJG/index.shtml
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牌号：20G/SA210A1/SA210C/SA106B/SA106C 标准：GB5310/ASMESA210/SA106 外径 (mm) 壁厚 4-4.5 5-5.5 6--7 7.5-8 8.5-9 9.5-10 11-12 13-14 15-16 17-20 21-25 ...
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