Welded Carbon Steel Tubes

Unidus Tube&Supply can supply ERW tubes according to tubing manufacturing standards like ASTM A513 type-1 & -2 or equivalent to meet customers requirements.

ERW tubing can be an ideal choice for structural applications, where dimensional tolerances are not critical. This tubing with appropriate modifications in mechanical properties can be used for bending, flattening, flaring or other types of fabrication applications. ERW tubing is available in a wide range of wall-to-diameter ratios and can be manufactured from Hot rolled/ Cold rolled steel.

Manufacturing procedure

Tubes are manufactured from mild steel strips slitted from Hot Rolled Low Carbon Steel coils. The strip passes through a series of drive forming and fin rolls and takes the required circular shape and is welded continuously by passage of an electric current of high frequency.

Advantages

Due to its excellent workability, scrap loss is minimal.

Due to its uniformity and concentricity, lighter walls can be specified, reducing the allowance for stock removal.

Standards

ASTM A513 Type 1  EN10305-3, DIN2393/DIN2394

Hot Rolled Electric-Resistance Welded (ERW) Carbon Steel Mechanical Tubing

ASTM A513 Type 2

Cold Rolled Electric-Resistance Welded (ERW) Carbon Steel Mechanical Tubing

Technical Specifications

DOM steel tubing is manufactured from electric resistance welded (ERW) tubes, followed by cold drawing over a mandrel and through a die. This process improves:

• Inside and outside diameter accuracy
• Surface finish (ID & OD)
• Mechanical properties
• Concentricity
• Wall thickness uniformity

Manufacturing Flow:
ERW Tube → Cold Drawing → Mandrel Drawing → Heat Treatment →Straightening → Inspection → Cutting

DOM tubing is an ideal solution for applications requiring tight tolerances, high concentricity, and consistent wall thickness, especially for precision machining and structural components.