SAE J524 Seamless Hydraulic Line Pipe

Cold drawn precision tubes,suitable for hydraulic and pneumatic circuits,are normalized in a controlled atmosphere.This treatment,together with the fine grain of E235,allows an excellent cold deformation.

✅ SAE J524 & Dual-Standard Compliance: Meets DIN 2391/EN 10305-4 standards for global compatibility.
✅ Seamless Cold-Drawn Construction: Zero weld seams eliminate weak points, enhancing pressure resistance and leak prevention.
✅ Heat-Treated Durability: Stress-relieved (+SR) or annealed (+A) states prevent deformation under cyclic loads.
✅ Precision Tolerances: OD: 10–300mm (±0.1mm), Wall Thickness: 1–8mm (±0.05mm), Straightness: ≤1.2mm/m.
✅ Corrosion Resistance: Phosphated (NBK) surface treatment + internal oiling for harsh environments.

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J524 Seamless Hydraulic Tube Description

Precision-engineered for high-pressure fluid transmission in industrial hydraulic systems. Manufactured from cold-drawn carbon steel (ST37.4) or stainless steel, our J524 pipes deliver burst pressure ≥4× working pressure (up to 50 MPa) and Ra ≤0.4μm internal smoothness to minimize friction and extend seal life. Ideal for excavators, agricultural machinery, and injection molding equipment requiring ISO/DIN-compliant tubing.

Seamless Hydraulic Tubing Technical

Parameter	Specification	Standard
Material	ST37.4, Stainless Steel	SAE J524, DIN 2391
OD Range	10–76 mm	Tolerance: ±0.1mm
Wall Thickness	1–8 mm	Tolerance: ±0.05mm
Working Pressure	30–50 MPa	Burst Pressure: ≥120 MPa
Temperature Range	-40°C to +120°C	Pressure derating >150°C
Surface Finish	Phosphated (NBK) + Oiled	Ra ≤0.4μm
Length	5–12 m (Customizable)	Ends: Beveled/Capped

Hydraulic Line Tubing Applications

Construction Machinery: Hydraulic cylinders for excavators/cranes (high-pressure lines).
Agricultural Equipment: Tractor steering/lifting systems (resists vibration fatigue).
Industrial Automation: Injection molding machines, press brakes (precision fluid control).
Marine & Offshore: Hydraulic winches/pumps (saltwater corrosion resistance).

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

Q: Can you supply dual-standard (SAE J524 + DIN 2391) pipes?
A: Yes! All pipes undergo dual-standard testing.
Q: Do you support custom OD/wall thickness outside standard range?
A: Custom sizes (e.g., OD 40mm) available at MOQ 1,000 meters.
Q: What is the hose/tube fitting compatibility?
A: Compatible with SAE J356/J526 flared fittings and DIN 2353/EN 10305 compression fittings.