Our Hydraulic Cylinder Tubes – ASTM A513 ST52 Cold Drawn Welded (CDW) are engineered to deliver a balance of high precision, reliability, and cost-effectiveness. Manufactured through Electric Resistance Welding (ERW) and subsequently cold drawn over mandrel (DOM), these tubes achieve excellent dimensional accuracy, smooth inner surfaces, and superior straightness.
Specifically developed for honing or skiving & roller burnishing (SRB) processes, these tubes provide an ideal bore finish for hydraulic and pneumatic cylinder applications in industries such as construction, agriculture, automotive, and material handling.
Typical Steel Grades
·ASTM A513 Type 5 (Drawn Over Mandrel, DOM)
·ST52 / E355 Equivalent
·SAE 1020, SAE 1026 (optional grades)
·E235 (for light-duty applications)
Common Sizes (OD × WT)
·Ø40 mm × 2.5 mm
·Ø50 mm × 3 mm
·Ø63.5 mm × 4 mm
·Ø76 mm × 5 mm
·Ø90 mm × 6 mm
·Ø100 mm × 6 mm
·Ø120 mm × 8 mm
·Ø150 mm × 10 mm
Note: Both metric and imperial DOM tube sizes are available upon request.
Technical Specifications
·Standard: ASTM A513, Type 5 (CDW / DOM Tubing)
·Steel Grade: ST52 / SAE 1026
·Condition: Cold Drawn, Normalized
·Straightness: ≤ 0.5:1000
·Tolerances: OD & WT per ASTM A513 standard
·Surface Finish (as supplied): ID Ra ≤ 2.5 μm
·Surface Finish (after honing/SRB): ID Ra ≤ 0.4 μm
Manufacturing Process
1. Hot Rolled Steel Strip → precision slit
2. Electric Resistance Welding (ERW) → forming of mother tube
3. Heat Treatment / Normalization → eliminates stresses and improves weld integrity
4. Cold Drawing Over Mandrel (DOM) → ensures accurate OD/ID, improved strength
5. Cutting & Straightening → achieves excellent length accuracy and straightness
6. Final Inspection → dimensional checks, weld seam quality testing, surface evaluation
Key Features & Benefits
·Cost-effective alternative to seamless ASTM A519 tubes
·Excellent straightness and dimensional precision
·High weld seam quality due to normalization + DOM process
·Perfectly prepared for honing or SRB finishing
·Supplied in metric and imperial sizes for global compatibility
Applications
·Hydraulic cylinders for construction equipment
·Agricultural machinery hydraulic systems
·Industrial automation & robotics
·Material handling & lifting equipment
·Pneumatic cylinders
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