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GB T 3639 is suitable for manufacturing cold drawn or cold rolled precision seamless steel tubes with special dimensional accuracy and high surface quality requirements, such as mechanical structures, hydraulic equipment, and auto parts.GB T 3639-2000 20# seamless carbon steel tubes and GB T 3639-2000 20# seamless carbon steel tubes and pipes - guangju Products Made In China, China Manufacturer. Quick Details Standard ASTM, DIN, ASTM A789-2001, DIN 2391 Grade 10#-45#, 16Mn, ST35-ST52, 20#, 45#, 16Mn, ST37.4 Thickness 2 - 100 mm Section Shape Round Outer Diameter 40 - 320 mm Place of Origin Shandong, China (Mainland) Secondary Or Not Non-secondary Application GB T 3639-2000 20# seamless carbon steel tubes and pipes gb t 3639 c precision carbon seamless steel tube forGB T 3639-2000 20# seamless carbon steel tubes and pipes - guangju Products Made In China, China Manufacturer. Quick Details Standard ASTM, DIN, ASTM A789-2001, DIN 2391 Grade 10#-45#, 16Mn, ST35-ST52, 20#, 45#, 16Mn, ST37.4 Thickness 2 - 100 mm Section Shape Round Outer Diameter 40 - 320 mm Place of Origin Shandong, China (Mainland) Secondary Or Not Non-secondary Application

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