The SAE J526 Welded Mechanical Steel Tubes are made from low carbon steel and produced by electric resistance welding (ERW) process, with the purpose of providing the stable and reliable mechanical performances and dimensional accuracies. The controlled chemical composition (carbon, manganese, phosphorus and sulphur within specified limits) ensures good weldability, formability and durability for pressure tubing applications. SAE J526 tubes are also an excellent combination of tensile strength, yield strength and ductility and can be bent, double-flared, beaded, or brazed without loss of structural integrity. These tubes are produced to the SAE J526 specification, which guarantees uniformity in quality and performance to meet challenging industrial specifications. Amardeep Steel is a leading manufacturer and
supplier of SAE J526 Welded Mechanical Steel Tubes in India with a strict quality control process and timely delivery of high-quality tubes globally in various sizes and specifications.
Technical Data
Specifications of SAE J526 Welded Mechanical Steel Tubes
| Parameter | Details |
|---|---|
| Standard | SAE J526 — Welded Low-Carbon Steel Tubing Suitable for Bending, Flaring, Beading, Forming, and Brazing |
| Material / UNS Designation | UNS G10080 or UNS G10100 (low-carbon steel) |
| Manufacturing Process | Electric-resistance-welded (ERW), single wall; outside weld bead removed for a smooth, round surface |
| Nominal Tubing OD Range | 3.18 mm – 15.88 mm (Dash Size –2 through –10) |
| Wall Thickness Range | 0.64 mm – 0.89 mm across the standard dash-size table |
| Supply Condition | Coiled or straight length; straightness by agreement between supplier and purchaser |
| Certification | EN 10204 3.1 Mill Test Certificate available on request |
Chemical Composition of SAE J526 Welded Mechanical Steel Tubes
| UNS / Grade | C (%) | Mn (%) | P (%) max | S (%) max |
|---|---|---|---|---|
| UNS G10080 (SAE 1008) | 0.10 max | 0.30 – 0.50 | 0.040 | 0.050 |
| UNS G10100 (SAE 1010) | 0.08 – 0.13 | 0.30 – 0.60 | 0.040 | 0.050 |
Mechanical Properties of SAE J526 Welded Mechanical Steel Tubes
| Property | Requirement |
|---|---|
| Yield Strength, min (0.2% offset) | 170 MPa |
| Tensile Strength, min | 290 MPa |
| Elongation in 50 mm, min | 14% |
| Hardness (Rockwell 30T scale), max | 65 HR30T |
Equivalent Grades of SAE J526 Welded Mechanical Steel Tubes
| Standard | Description | Relationship to SAE J526 |
|---|---|---|
| DIN 74234 | Hydraulic braking systems — brake pipes, flares | European equivalent for brake-line tubing |
| ISO 4038 | Road vehicles — hydraulic braking systems, simple flare pipes | International equivalent |
| SAE J524 | Seamless low-carbon steel tubing | Seamless counterpart to J526 |
| SAE J525 | Welded and cold-drawn (redrawn) low-carbon steel tubing | Better forming/flaring performance than J526 |
| SAE J527 | Double-wall copper-brazed steel tubing (“Bundy tube”) | Used where higher pressure rating or corrosion resistance is needed |
| SAE J356 | Welded low-carbon tubing suitable for severe forming | Used in place of J526 where single-flare is required |
Dimension Chart of SAE J526 Welded Mechanical Steel Tube
| Dash Size | Nominal OD (mm) | OD Tolerance (±mm) | Wall Thickness (mm) | WT Tolerance (±mm) |
|---|---|---|---|---|
| –2 | 3.18 | 0.05 | 0.64 | 0.13 |
| –3 | 4.76 | 0.08 | 0.71 | 0.13 |
| –4 | 6.35 | 0.08 | 0.71 | 0.08 |
| –5 | 7.94 | 0.08 | 0.71 | 0.08 |
| –6 | 9.53 | 0.08 | 0.71 | 0.08 |
| –7 | 11.11 | 0.10 | 0.76 | 0.08 |
| –8 | 12.70 | 0.10 | 0.76 | 0.08 |
| –8 (heavy wall) | 12.70 | 0.10 | 0.89 | 0.09 |
| –9 | 14.29 | 0.10 | 0.76 | 0.08 |
| –10 | 15.88 | 0.10 | 0.89 | 0.09 |
Applications of SAE J526 Welded Mechanical Steel Tubes
- Automotive Brake Lines
- Automotive Fuel Lines
- Refrigeration and Air-Conditioning Lines
- Hydraulic Pressure Lines
- General Bending, Flaring, Beading and Forming Applications
- Brazed Tube Assemblies
Frequently Asked Questions
1. What are SAE J526 Welded Mechanical Steel Tubes?
SAE J526 Welded Mechanical Steel Tubes are single-wall, electric-resistance-welded low-carbon steel tubes made from UNS G10080 or UNS G10100 steel. They offer consistent dimensional accuracy and a smooth finished surface suited to bending, flaring, beading, forming, and brazing.
2. What are SAE J526 tubes used for?
These tubes are commonly used for automotive brake lines, fuel lines, refrigeration and air-conditioning lines, hydraulic pressure lines, and other applications requiring bending, flaring, beading, forming, or brazing.
3. What is the equivalent standard of SAE J526?
The commonly referenced European equivalents are DIN 74234 and ISO 4038, both covering hydraulic brake-line tubing, although final material selection should always be confirmed against the applicable project specification.
4. What is the difference between SAE J526, J525, and J527?
SAE J526 is single-wall welded tubing for general bending and flaring. SAE J525 is welded and then cold-drawn (redrawn) for improved forming performance. SAE J527 is double-wall copper-brazed tubing, commonly known as Bundy tube, used where higher burst strength or corrosion resistance is needed.
5. Can SAE J526 tubing be single-flared?
No. SAE J526 tubing is not recommended for single-flare applications because the inside-diameter weld bead can create a potential leak path. SAE J356 is the appropriate specification where single-flare or more severe forming is required.
6. What sizes are available for SAE J526 Welded Mechanical Steel Tubes?
SAE J526 tubing is produced in standard dash sizes from –2 (3.18 mm OD) through –10 (15.88 mm OD) as tabulated above, with wall thicknesses from approximately 0.64 mm to 0.89 mm, depending on manufacturer capability and project requirements.
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