DIN2391 high-precision bright seamless steel pipe is made of Baosteel high-quality carbon steel material. It has undergone fine drawing, non-oxidizing bright heat treatment (NBK state), non-destructive testing, high-pressure washing and pickling of the inner hole of the steel pipe, anti-rust treatment of the inner and outer walls of the steel pipe with anti-rust oil, and sealing covers at both ends for dustproof treatment. The produced steel pipe has high precision and good finish, the inner and outer walls of the steel pipe have no oxide layer, the steel pipe can withstand the high pressure of liquid flow, and the steel pipe is not deformed in cold bending, can be flared, flattened and has no cracks. Mechanical properties can be bent at any angle without deformation. It is mainly used for the preparation of steel pipes in the hydraulic system oil circuit, also called hard piping in the hydraulic system, and precision steel pipes for automobiles, which can meet the requirements of high precision, high smoothness, tensile strength and high mechanical properties of steel pipes. 2. DIN2391 high-precision black phosphating steel pipe adopts DIN2391 high-precision bright seamless steel pipe as the basis, and phosphating agent dilution formula is used to phosphate the inner and outer walls of bright precision steel pipe. At the beginning, the inner and outer walls of the steel pipe form a black protective film to protect the steel pipe from rust. The black phosphating steel pipe is shiny in black, with good color and strong anti-rust ability. High-precision black phosphating steel pipes are mainly used as pipes in hydraulic systems, and are more ideal for fittings with clamping sleeves (steel pipes). 3. DIN2391 high-precision precision galvanized steel pipe adopts high-precision bright seamless steel pipe to electro-galvanize it, and the inner and outer walls of the steel pipe are plated with yellow zinc (color zinc), white zinc, passivation treatment, and the length of the galvanized steel pipe is within 6 meters.
The precision steel pipe produced is a seamless pipe after precision cold drawing, which is made of phosphating and anti-rust treatment after eliminating surface and internal stress through oxygen-free tempering treatment. The product has high dimensional accuracy, good ductility, easy processing and bending into various required shapes without reducing or flattening the cross section of the pipe. The surface of the pipe has high precision, moderate surface hardness after oxygen-free tempering treatment, and is easy to clamp and connect. The inner hole and surface can be directly installed without pickling and rust removal after phosphating and rust prevention treatment. Product specifications for the outer diameter (D)Φ4mm-76mm, wall thickness (S)0.5 mm-6.0mm, can be customized according to customer requirements. The length is 6 meters (except for custom-made), and the delivery status is NBK (normalizing), GBK (annealing) and BKS (stress relief annealing). The main materials used are ST35, ST37.4(10#), ST45(20#), ST55(35#), ST52(16Mn), etc. Bright precision seamless steel pipe can be phosphated according to customer requirements, color zinc plating (yellow zinc), white zinc, with a length of 6 meters