Technical standards for hydraulic pipes

Posted by zora li on April 7th, 2024

Technical standards for hydraulic pipe

In the standard it is DIN2391-1. The raw materials of the hydraulic  pipe have been finely drawn, non-oxidized and brightly heat treated (NBK state), non-destructive testing, the inner hole of the steel pipe has been high-pressure rinsed and pickled, the inner and outer walls of the steel pipe are treated with anti-rust oil, and both ends are capped for dust prevention. . 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 flow through it. The steel pipe does not deform when cold-bent, and can be expanded and flattened without cracks. Mechanical properties: Can be bent at any angle without deformation. Mainly used as steel pipes in the oil circuit of hydraulic systems, also called hard piping in hydraulic systems. Precision steel pipes for automobiles. The specifications are generally outer diameter (D) Φ4mm-76mm and wall thickness (S) 0.5mm-6.0mm. The length is fixed length 6 meters (except custom-made), and the delivery status is NBK (normalized), GBK (annealed), BKS (stress relief annealed). 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. client.

European standard EN10305-4: 2003 shall prevail. Introduction to hydraulic steel pipe: The precision hydraulic steel pipes produced are precision cold-drawn seamless pipes, which are made through anaerobic tempering treatment to eliminate surface and internal stress and then undergo phosphating and anti-rust treatment. The product has high dimensional accuracy and good ductility, and is easy to process and bend into various required shapes without reducing or flattening the pipe cross-section; the pipe has high surface precision, moderate surface hardness after anaerobic tempering treatment, and is easy to connect with ferrules. The inner hole After the surface is phosphated and rust-proofed, it can be installed directly without pickling and rust removal.

Honed pipe: Cold-rolled precision seamless steel pipe is made of finished seamless steel pipe or raw seamless pipe, which is pickled, phosphated, and saponified, and then rolled by a cold-rolled pipe machine to form a hydraulic steel pipe. The extremely high precision of hydraulic steel pipes can generally be controlled within the range of 0.02-0.05MM. The standard is: GB3639-83, the allowable deviation of the inner diameter is 0.03mm, the inner surface roughness: Ra 0.2~0.8μm, and the straight line of the hydraulic steel pipe Degree: 0.3~1.5mm/m, specially used for oil steel barrel diameter.

The weight of seamless steel pipe kg/m = (Od - Wt) * Wt * 0.02466 where Od is the outer diameter and Wt is the wall thickness: (outer diameter - wall thickness) * wall thickness * 0.02466 Kg/m.