What Are CDW Tubes?
Per IS 3074 and DIN 2393, Cold Drawn Welded (CDW) tubes start as ERW tubes, then are cold drawn through a die and mandrel for tight dimensional tolerances (±0.1 mm OD), smooth finish, and enhanced mechanical properties. Cold drawing work-hardens the steel, raising yield strength above the base ERW tube per EN 10305-2. CDW tubes bridge the gap between standard ERW (loose tolerances) and seamless (high cost) — precision at an economical price point.
- ERW + cold drawn: precision tolerances at economical cost
- Tight OD/ID tolerances (±0.1mm typical) and smooth surface finish (Ra ≤ 1.6 μm)
- Round, square, rectangular, and custom-shaped profiles available
- Higher yield and tensile strength than parent ERW tube due to work hardening
Specifications We Stock
| Outer Diameter (OD) | 6mm to 120mm (round); custom sizes for square/rectangular |
|---|---|
| Wall Thickness (WT) | 0.8mm to 10mm |
| Grades | IS 3074, DIN 2393 (St 37/St 52), EN 10305-2, ASTM A513, SAE 1020 |
| Tolerances | OD ±0.1mm, WT ±10%, straightness ≤ 1mm/m |
| Lengths | Random (4–7m), fixed cut lengths, or exact cut-to-length |
Common Applications
- Automotive: Steering columns, propeller shafts, axle tubes, shock absorber cylinders.
- Furniture: Office chairs, tables, shelving, gym equipment, display racks.
- Hydraulic & Pneumatic: Cylinder barrels, piston rods, pneumatic lines, actuator housings.
- Bicycle & Two-Wheeler: Frame tubes, handlebar tubes, seat posts, fork legs.
Source Mills We Work With
We procure materials exclusively from highly reputed Indian and global steel mills, including:
Tube Investments of India (TII)Goodluck India LtdHi-Tech Pipes Ltd
Applicable Standards & Specifications
How To Order
- Specify profile (round/square/rectangular), OD or dimensions, wall thickness, and grade.
- Indicate surface finish and tolerance requirements for your application.
- Provide quantity (in meters, pieces, or MT) and delivery location.
- Approve quotation and PO — we dispatch from Kanpur stockyard or coordinate mill supply.
Frequently Asked Questions
What is the difference between CDW tubes and seamless tubes?
CDW tubes start as ERW welded tubes that are subsequently cold drawn to achieve precision tolerances. Seamless tubes start from solid billets that are hot-pierced and optionally cold drawn. CDW tubes are 20–40% cheaper than seamless for equivalent sizes and offer comparable dimensional accuracy. Seamless tubes are preferred when weld-seam-free integrity is critical (high-pressure hydraulic, boiler service). For automotive, furniture, and general engineering, CDW tubes are the standard choice.
What shapes are CDW tubes available in?
CDW tubes are available in round, square, rectangular, and special-shaped (D-section, oval, hexagonal, triangular) profiles. Round tubes are most common for automotive and hydraulic applications. Square and rectangular profiles are used in furniture, display systems, and structural fabrication. Special shapes can be produced with custom dies for specific engineering applications.
What surface finish can CDW tubes achieve?
Standard CDW tubes achieve a surface roughness of Ra ≤ 1.6 μm (N7) as-drawn. For hydraulic cylinder applications requiring smoother surfaces, honing or roller burnishing can bring the internal finish to Ra ≤ 0.4 μm (N5). External finish can be improved by polishing, chrome plating, or powder coating depending on the end application.
Related
- Calculate the weight of CDW Tubes (Cold Drawn Welded) for your BOQ — size, wall, and length to MT before requesting a quote.
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