Seamless steel pipe is one kind of steel tubing with a hollow section, no seams around the strip.The high-precision cold drawn tube is made of hot rolling seamless steel tube and longitudinal welded pipe blank, which are processed on special cold drawing machine with die by particular deformation mechanism design after chemical treatment.The Product performs Chinese national standard GB/T 3639-2009: Cold-drawn or cold-rolled precision seamless steel tubes, Which is modified in relation EN 10305-1:2002(Steel tubes for precision applications-Technical delivery conditions Part 1: Seamless cold drawn tubes).The product possesses strictly diameter accuracy, whose external diameter is measured with outside micrometer, inner diameter with inner scale. Inside and outside surface finish and straightness are both fine. Straightness range is 0.3 ~ 0.5 mm/m, inner-hole roughness range is 0.8 ~ 1.6 μm, wall thickness difference is ± 5%.Technical parameters（GB/T 3639-2009（MOD EN 10305-1:2002））Our company’s high-precision cold drawn tube can be customized in steel grades and sizes. Existing products‘ external diameter range is Φ60mm~Φ299mm,length less than 13m, and materials cover 20#、45#、16Mn、25Mn and high strength low alloy cold drawn tubes and honing tubes.The standard grade table of seamless steelHigh-precision cold drawn steel tube is a new type of high-tech energy-saving products. Advantages include:1)High-precision cold drawn steel tube adopts cold-drawing technology , can be used as hydraulic and pneumatic cylinder tubes, hydraulic pipelines, oil pump pipes and so on, especially non-standard special long stroke cylinders.2)The metal structure of cold drawn steel tube presents fibrous, which effectively improves the performance of metal. Usually , the strength limit of the finished tube layer increases 60%, which is very helpful for building compactness and lightweight equipment.3)All hot rolled tubes have been detected by nondestructive inspection, and there are no defects in stock, which really ensures product performance. Such standard rate and metal utilization are both above 95%.4)High-precision cold drawn tube is efficiently processed without inner-hole machining. Such, a 250 mm diameter, 10 m long cylinder only takes 4 min, Which is conducive to timely supply high-precision products.The company provides diversified delivery conditions of products, such as Cold drawn and stress relieved (+ SR), annealed (+ A), normalized (+ N).When order product, customers need providing product name, steel grade, dimensions, quantity (weight/length), delivery condition, processing way, and special requirements, etc.