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11. GB/T3639 1983 (cold drawn or cold rolled precision seamless steel tube). It mainly used in steel pipes for the mechanical structure, carbon pressure equipment of high precise size and good surface finish. Its representative materials are Steel No 20 and No 45, etc.
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TypeSeamless TechniqueCold Drawn MaterialCarbon Steel Surface TreatmentRust Proofing UsageHydraulic/Automobile Pipe Section ShapeRound
