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Carbon ug carbon-manganese steel seamless steel tubes ug pipes alang sa shipGB/T5312
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Seamless steel tubes alang sa structural purposeGB/T8162
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Cold-drawn o cold-rolled precision seamless steel tubesGB/T3639
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Seamless steel tubes alang sa high-pressure alang sa kemikal nga abono equipementsGB/T6479
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Seamless steel tubes ug pipes alang sa high pressure boilerGB/T5310
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Seamless steel tubes alang sa ubos ug medium pressure boilerGB/T5310
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Seamless steel tubes alang sa liquid serviceGB/T8163
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Seamless steel tubes alang sa petrolyo crackingGB/T9948