GB-T-3639-Q335B-Steel-Pipe-Specification

Carbon Steel Pipe and Alloy Steel Tube Manufacturers and SuppliersGB/T 3639 Q355B Steel Pipe SpecificationGB/T 3639 Q355B is a seamless precision low-alloy steel tube containing a maximum of 0.24carbon and 1.60 manganese manufactured by cold rolling or cold drawing process withspecial dimensional accuracy and high surface quality requirements.It is commonly used in the manufacture of mechanical structures,hydraulic equipment,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 massSteelgrade51Mn9CuQ355B0.24 max0.55 max1.60 max0.025max0.025max0.30 max0.30 max0.40 maxWhatsApp:008613463768992 Email:sales@botopsteelpipes.com Website:www.botopsteelpipes.com