SAE J525 Thick Wall Mild Steel Hydraulic Tube for Precision Instruments and Industrial Machinery
SAE J525 Thick Wall Mild Steel Tube – Alloy Hydraulic Tube for Precision Instruments
Material
SAE J525 tubing is manufactured from high-quality mild carbon steel, processed by electric resistance welding and then fully normalized to achieve uniform grain structure and excellent ductility. It is specifically designed as a hydraulic tube with thick walls to handle pressure applications while ensuring precision and safety.
Specifications
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Standard: SAE J525
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Manufacturing Process: Electric Resistance Welded (ERW), Normalized
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Wall Thickness: Thick wall, per SAE J525 requirements
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Shape: Round tube
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Finish: Smooth, suitable for bending and flaring
Chemical Composition (Typical, wt%)
| Grade | C (%) | Mn (%) | P (%) | S (%) | Fe (%) |
|---|---|---|---|---|---|
| SAE J525 | ≤0.18 | 0.30–0.60 | ≤0.035 | ≤0.035 | Balance |
| ASTM A179 | ≤0.06 | 0.27–0.63 | ≤0.035 | ≤0.035 | Balance |
| ASTM A513 Type 5 (1020) | 0.18–0.23 | 0.30–0.60 | ≤0.040 | ≤0.050 | Balance |
| EN 10305-4 E235 | ≤0.17 | ≤1.20 | ≤0.025 | ≤0.025 | Balance |
| JIS STKM11A | ≤0.15 | 0.30–0.60 | ≤0.030 | ≤0.030 | Balance |
Mechanical Properties
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HRB) |
|---|---|---|---|---|
| SAE J525 | 290–430 | ≥180 | ≥35 | ≤72 |
| ASTM A179 | ≥325 | ≥180 | ≥35 | ≤72 |
| ASTM A513 Type 5 (1020) | 350–450 | ≥210 | ≥25 | ≤85 |
| EN 10305-4 E235 | 340–480 | ≥235 | ≥25 | ≤80 |
| JIS STKM11A | ≥290 | ≥180 | ≥30 | ≤72 |
Key Features
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Excellent formability, bendability, and flare capability
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Uniform grain structure due to full normalization
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High dimensional accuracy and smooth internal surface
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Reliable for hydraulic systems under pressure
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Enhanced safety in precision instruments applications
Applicable Standards
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SAE J525 (North America)
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ASTM A179 / ASTM A513 (USA equivalent options)
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EN 10305-4 (European equivalent)
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JIS G3445 STKM series (Japanese equivalent)
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GB/T 3639 (Chinese equivalent for precision tubes)
Applications
SAE J525 tubes are primarily used in hydraulic and pneumatic systems where safety and precision are critical.
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Automotive Industry: Brake lines, fuel lines, hydraulic power steering systems
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Industrial Machinery: Hydraulic cylinders, fluid power systems, lubrication lines
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Precision Instruments: Measuring and control systems requiring high reliability
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Construction Equipment: Hydraulic lines for excavators, loaders, and cranes
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Aerospace & Marine: Specialized hydraulic control systems
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