GB-T-3639-Grade-20-Steel-Pipe-Specification

Carbon Steel Pipe and Alloy Steel Tube Manufacturers and SuppliersGB/T 3639 Grade 20 Steel Pipe SpecificationGB/T 3639 Grade 20 is a seamless precision carbon steel tube containing 0.17-0.23 carbonand 0.35-0.65 manganese manufactured by cold rolling or cold drawing process with specialdimensional accuracy and high surface quality requirements.GB/T 3639 Grade 20 is commonly used in the manufacture of mechanical structures,hydraulicequipment,automotive parts,and components.女Manufacture ProcessCold-drawn seamless;Cold-rolled seamless;女DimensionOutside diameter:380 mm or less;Wall thickness:0.5-25 mm;Delivery ConditionSymbolDesignationDescription+CCold finished (hard)No heat treatment after final cold finishing.+LCCold finished (soft)Final heat treatment is followed by a suitable cold finishing.+5RCold finished and stress-relievedAfter final cold finishing,the tubes are stress-relieved and annealed in a controlled atmosphere.+AAnnealedAfter final cold finishing,tubes are fully annealed in a controlled atmosphere.+NNormalizedAfter final cold finishing,the tubes are normalized in a controlled atmosphere女Chemical ComponentsChemical composition(cast analysis)%by massSteel gradeSiMn⊙NiCu200.17-0.230.17-0.370.35-0.650.025max0.025max0.25m3x0.30m3x0.25m3xWhatsApp:008613463768992 Email:sales@botopsteelpipes.com Website:www.botopsteelpipes.com