Manufacturing Process
- Cold Drawing
Billets are perforated and cold-drawn to achieve seamless hollow sections with H8-H9 dimensional accuracy.
2. Precision Honing
Internal surfaces are honed to Ra 0.2–0.4μm, reducing fluid turbulence and seal wear.
3. Heat Treatment
Stress-relieving (+SR) or annealing (+A) stabilizes microstructure, ensuring tensile strength ≥52 kg/cm².
4. Quality Validation- Eddy current testing for defects
- Hydrostatic burst testing (4× working pressure)
- Spectrometer material verification.
FAQ
1. What is SAE J524?
SAE J524 is a standard set by the Society of Automotive Engineers for automotive and industrial hydraulic tubing. It defines the dimensions, wall thickness, and performance requirements for steel tubes used in fluid systems. J524 tubing is designed to handle hydraulic fluids, oils, and other liquids safely under pressure.
Manufacturers follow this standard to ensure tubes fit correctly, perform reliably, and resist leaks or bursts. Using SAE J524 tubing helps engineers and technicians choose the right pipe for brakes, power steering, and other hydraulic systems in vehicles and machinery.
2. What is the difference between J524 and J525 tubing?
The main difference between SAE J524 and J525 tubing is how they are made and their strength. J524 tubing is drawn or rolled steel, suitable for lower-pressure hydraulic systems. J525 tubing is electric-resistance welded (ERW) and has higher strength, making it better for higher-pressure applications.
Both follow SAE standards, but J525 can handle more demanding conditions without failing. Choosing between them depends on your system’s pressure and safety needs. For most automotive applications, J524 is enough, while J525 is preferred for heavy machinery or high-pressure lines.
3. What is hydraulic tubing used for?
Hydraulic tubing is used to transport fluids in hydraulic systems. It carries oil, water, or other liquids under pressure to power machines and equipment. Common uses include vehicle brakes, construction machinery, and industrial machines. Hydraulic tubing ensures smooth operation, prevents leaks, and withstands pressure and heat.
Using the right tubing size and material is important for safety and efficiency. Steel, stainless steel, and sometimes copper are popular choices because they resist corrosion and high pressure. Proper hydraulic tubing helps machines work reliably for years.
4. Can you supply dual-standard (SAE J524 + DIN 2391) pipes?
Yes! All pipes undergo dual-standard testing.
5. Do you support custom OD/wall thickness outside standard range?
Yes, Custom sizes (e.g., OD 40mm) available at MOQ 1,000 meters.
6. What is the hose/tube fitting compatibility?
Compatible with SAE J356/J526 flared fittings and DIN 2353/EN 10305 compression fittings.
