Copper Coated Steel Tube (Single Wall, Welded)
Copper coated steel tube is a single-wall, low-carbon steel tube that is roll-formed from copper coated steel strip and electric-resistance welded (ERW). The copper coating is on the strip surface before forming, so the finished tube is copper coated on the surface while the longitudinal weld remains steel — there is no copper at the weld seam. This is different from a double-wall, copper-brazed “Bundy” tube, where copper is used to braze the overlapping wall.
Price: quoted per specification. Steel and copper prices follow the raw-material market, so each price is confirmed at the time of order.
Specifications
- Construction: single-wall, ERW welded from copper coated low-carbon steel strip
- Grades: low-carbon steel, 1010 / 1020 / SPCC type
- Base tube standard: SAE J526 / J2614 single-wall welded low-carbon tube; copper coated strip to YB/T 069
- Size range: OD 3–16 mm, wall 0.5–1.5 mm (common brake line OD: 4.76, 6, 6.35, 8, 10 mm)
- Surface: copper coated (plated), oiled
- Delivery: coil, approx 200 kg per coil, or cut lengths
- Documents: mill test certificate, EN 10204 3.1
Applications
- Automotive brake lines and fuel lines
- Oil, transmission and fluid lines
- Refrigeration condenser and evaporator tube
- Wire-tube condenser for refrigerators and freezers
- Heating and cooling units
Single wall vs double wall brazed
Single-wall copper coated tube is welded with no copper at the seam, which keeps the cost down for high-volume fluid lines and refrigeration circuits. Double-wall copper-brazed tube uses copper to seal an overlapping wall and is a different construction. Tell us which one your drawing calls for and we will quote the correct product.
Forming and joining
The soft, copper coated surface suits controlled bending and double-flare or braze joining. Each coil is tested for chemistry, dimensions, surface and weld integrity, then strapped and wrapped for export.