What is hydraulic honed steel pipe?
Hydraulic steel pipe is basically divided into fluid pipe and oil steel cylinder pipe used on hydraulic system, also known as honed pipe, while cold-drawn or cold-rolled precision seamless steel pipe also contains hydraulic steel pipe
The fluid tube on the hydraulic system in the domestic national standard close to the standard is GB3639-83. hydraulic steel pipe introduction: cold-drawn or cold-rolled precision seamless steel pipe with high dimensional accuracy and good surface finish for hydraulic equipment. Precision seamless steel tube is selected to manufacture mechanical structures or hydraulic equipment, etc. Precision steel tube is a kind of high precision seamless steel tube after cold-drawn or cold-rolled treatment. Since precision steel pipe has no oxidation layer on the inner and outer walls, bears high pressure without leakage, high precision, high finish, no deformation in cold bending, flaring and flattening without cracks, etc., it is mainly used to produce pneumatic or hydraulic products.
In the standard is DIN2391-1 . The raw materials of hydraulic steel pipe are finely drawn, oxidation-free bright heat treatment (NBK state), non-destructive testing, steel pipe bore through high-pressure flushing, pickling, rust-proof treatment with anti-rust oil on the inner and outer walls of the steel pipe, capping at both ends as dust-proof treatment. Production out of steel pipe with high precision, good finish, no oxidation layer on the inside and outside wall of the steel pipe, steel pipe can withstand the high pressure of liquid flow through, and steel pipe cold bending does not deform, can be flared, flattened without cracks. Mechanical properties can be bent at any one angle without deformation. Mainly used as hydraulic system oil circuit with steel pipe, also known as hydraulic system in the hard with the tube, automotive precision steel pipe, specifications are generally outside diameter (D) Φ4mm-76mm, wall thickness (S) 0.5mm-6.0mm. length for the fixed 6 meters (except custom-made), delivery status NBK (normalized), GBK (annealed), BKS (stress relief annealed). The main materials used are ST35, ST37.4 (10#), ST45 (20#) ST55 (35#), ST52 (16Mn), etc. to meet the requirements of high precision, high finish, tensile strength and high mechanical properties of the steel pipe customers.
European Standard EN10305-4: 2003 quasi-hydraulic steel pipe introduction: the production of precision hydraulic steel pipe is precision cold-drawn seamless tube through oxygen-free tempering treatment to eliminate surface and internal stress and then made of phosphate anti-rust treatment. High dimensional accuracy, good ductility, easy processing and bending into a variety of shapes required without reducing or flattening the tube cross-section; high surface accuracy, moderate surface hardness after oxygen-free tempering treatment is easy to ferrule connection, the inner hole and surface by phosphate antirust treatment can be installed directly without pickling and rust removal.
Honed pipe: cold-rolled precision seamless steel pipe is made of seamless steel tube finished tube or seamless tube barren tube, after pickling, phosphating, saponification treatment, and then rolled by cold rolling mill into hydraulic steel pipe. Hydraulic steel pipe precision is extremely high generally can be controlled within the range of 0. 02-0. 05MM, its standard is: GB3639-83, the allowable deviation of the internal warp is 0.03mm, the internal surface roughness: Ra 0.2 ~ 0.8μm, hydraulic steel pipe straightness: 0.3 ~ 1.5mm/m, dedicated to do the cylinder diameter of oil steel.
Weight of seamless steel pipe kg/m = (Od - Wt) * Wt * 0.02466 where Od is the outside diameter Wt is the wall thickness (: (OD - wall thickness) * wall thickness * 0.02466 Kg/m.