Hydraulic steel pipe

Hydraulic steel pipes are basically divided into fluid pipes and oil steel tubes used in hydraulic systems, also known as honing pipes. Hydraulic seamless mild steel tubes belong to one of them, and cold drawn or cold-rolled precision seamless steel pipes also include hydraulic steel pipes.

Seamless precision tube are used to manufacture mechanical structures or hydraulic equipment, etc. The precision steel pipes are a kind of high-precision seamless steel pipes processed by cold drawing or cold rolling. Since the inner and outer walls of precision steel pipes have no oxide layer, bear high pressure without leakage, high precision, high smoothness, cold bending without deformation, flaring, flattening without cracks, etc., they are mainly used to produce pneumatic or hydraulic products.

Common technical standards:

DIN2391-1: The raw materials of hydraulic steel pipes are subjected to fine drawing, non-oxidizing bright heat treatment (NBK state), non-destructive testing, the inner hole of the steel pipe is washed and pickled under high pressure, the inner and outer walls of the steel pipe are treated with anti-rust oil and used for sealing at both ends Make dustproof treatment.　The steel pipe produced has high precision and good smoothness. There is no oxide layer on the inner and outer walls of the steel pipe. The steel pipe can withstand the high pressure of liquid flowing through, and the steel pipe is not deformed by cold bending, and can be flared and flattened without cracks. The mechanical properties can be bent at any angle without deformation. It is mainly used to prepare steel pipes in the oil circuit of hydraulic systems, also called hard piping in hydraulic systems. Precision steel pipes for automobiles are generally in outer diameter (D) Φ4mm-76mm, and wall thickness (S) 0.5mm-6.0mm. The length is 6 meters (except customized), and the delivery status is NBK (normalizing), GBK (annealing), BKS (stress relief annealing). The main materials used are ST35, ST37.4 (10#), ST45 (20#) ST55 (35#), ST52 (16Mn), etc., which can meet the requirements for steel pipes with high precision, high smoothness, tensile strength, and high mechanical properties.

European standard EN10305-4: The precision hydraulic steel pipes produced are precision cold drawn seamless pipes through anaerobic tempering treatment to eliminate surface and internal stress, and then phosphating rust prevention treatment. The product has high dimensional accuracy, good ductility, easy to process and bend into various required shapes without the pipe section being reduced or flattened; the pipe surface has high precision, after anaerobic tempering treatment, the surface hardness is moderate, and it is easy to connect with the clamping sleeve and the inner hole. And the surface can be installed directly without pickling and rust removal after phosphating antirust treatment.