Views: 0 Author: Site Editor Publish Time: 2025-09-26 Origin: Site
1. DIN2391 Seamless black phosphating hydraulic pipe: three core advantages, adapting to the needs of high-pressure scenarios
Precision seamless hydraulic pipes under the DIN standard system, DIN2391 are specially designed for high-pressure and high-cleanliness hydraulic systems, and embody the characteristics of "high pressure resistance, corrosion resistance, and high precision" of hydraulic pipes with standardized production and black phosphating protection technology:
a. Standard features: precision design, suitable for high-pressure working conditions
Follow the DIN2391 precision seamless steel pipe standard, and strictly control the core parameters:
Dimensional accuracy: dimensional tolerance ±0.05mm, to avoid high-pressure leakage caused by dimensional deviation;
Pressure-bearing capacity: The pipe has been strengthened by cold drawing, and the tensile strength and yield strength have been significantly improved, which can stably withstand the high-pressure hydraulic system (conventional working conditions) and is suitable for high-pressure equipment such as high-pressure hydraulic valve group.
b. Black phosphating process: double protection, extending the system operation and maintenance cycle
The surface is treated with industrial-grade black phosphating to form a dense phosphating film, and the anti-rust oil sealing process is superimposed:
Strong anti-corrosion: phosphating coating can isolate moisture, impurities and external humid environment in hydraulic oil, avoid rust in the pipe and contaminate the valve group, and reduce the frequency of equipment maintenance;
Low friction loss: The smooth surface of the phosphating film can reduce the flow resistance of hydraulic oil, reduce the friction and wear of steel pipes and seals, and indirectly extend the service life of core components such as hydraulic pumps and cylinders.
Production process: Adopt multi-pass cold drawing molding, the mold strictly controls the outer diameter and wall thickness during the cold drawing process. After cold drawing, the steel pipe enters the continuous bright annealing furnace to eliminate internal stress: keep the surface clean, protect the atmosphere to avoid surface oxidation during annealing, and reduce the risk of impurities residues in the pipe. Black phosphating treatment forms a black dense film layer on the surface of the steel pipe to improve corrosion resistance. The eddy current detector is used for whole-tube flaw detection, and after the size detection of the outer diameter and wall thickness, the anti-rust oil is applied before packaging to enhance the corrosion resistance of the steel pipe.
DIN2391 Seamless black phosphating hydraulic pipes are widely used in the following fields due to their precision and high-pressure adaptability:
1. For Vehicle (Automotive, locomotive, Construction Machinery like Concrete pump and others)
A. Powertrain system:
• Fuel-rails • Fuel-lines • Common-rail diesel lines • Piston-cooling jets • SCR & EGR
• Rigid pipes • Oil- & water-cooling pipes
B. Fluid handling systems
• Tube assemblies • Air-conditioning tube • Clutch actuator pipes C. Drive and steering system • Ingrain Gear Pipes •
Power-Steering Feed-Pipes
D. Hydraulic system
• Hydraulic and Pneumatic Pressure Lines • Hydraulic fittings • Hydraulic tubing
E. Others For example
• Front axles • Sun-shading board wire tube and other wire tubes • Headrest chair Tube
2. Mechanical and engineering usage
• Mechanic Processing and parts • Metal processing •Heat Exchange • Gas Cylinders
•Sub-sea and Marine • Aerospace • Winder Power Equipment •Energy and Power Generation •Bearings • etc
Other usage for details as per customers requirements
Q1: What are the key features of DIN2391 Seamless Hydraulic Pipe?
A: The inner and outer walls of the steel pipe have no oxide layer, can withstand high pressure, no leakage, have the characteristics of high precision and high brightness, bend without deformation, flare and flatten without cracks, the surface is treated with anti-rust, and the mechanical process performance is excellent.
Q2: What are the common materials used for DIN2391 seamless hydraulic pipes?
A: The main materials are ST37.4, ST35, ST52.4, etc.
Q3: What are the production processes for DIN2391 seamless hydraulic pipes?
A: The raw materials have been finely drawn, non-oxidation bright heat treatment (NBK state), non-destructive testing, the inner hole of the steel pipe has been washed and pickled by high pressure, the inner and outer walls of the steel pipe are treated with anti-rust oil and anti-rust, and the caps at both ends are used as dust-proof treatment.
Q4: What scenarios is DIN2391 seamless hydraulic pipe suitable for?
A: It is widely used in hydraulic systems, such as automobile pipes, mechanical uses, cylinder tubes, motorcycle shock absorber steel pipes, automobile shock absorber inner cylinder barrels, etc.
