Square and Flat Copper Tube for Induction Heating Coils
Square and flat copper tubes are widely used to manufacture water-cooled induction heating coils for high-frequency and medium-frequency induction heating equipment. The copper tube carries high electrical current while cooling water flows through the internal passage to remove heat generated during operation.
We supply square, rectangular and flat copper tubes for induction coil applications in high-conductivity copper grades, with different cross-sectional dimensions and wall thicknesses. Straight tubes and coil forms can be supplied according to application and fabrication requirements.
Copper Square and Flat Tube Specifications
The following dimensions refer to the cross-section of the copper tube, not the overall tube length.
| Side A (mm) | Side B (mm) | Wall Thickness (mm) |
|---|---|---|
| 10–20 | 15–25 | 1–2.5 |
| 20–30 | 25–30 | 1–3 |
| 10–20 | 30–35 | 1–4 |
| 20–30 | 30–35 | 1–4 |
| 30–40 | 30–35 | 1–4 |
| 10–20 | 35–40 | 1–4 |
| 20–30 | 35–40 | 1–4 |
| 30–40 | 35–40 | 1–4 |
| 10–20 | 40–50 | 1–5 |
| 20–30 | 40–50 | 1–5 |
| 30–40 | 40–50 | 1–5 |
| 40–50 | 40–50 | 1–6 |
| 20–30 | 50–60 | 1.2–5 |
| 30–40 | 50–60 | 1.2–5 |
| 40–50 | 50–60 | 1.2–8 |
| 50–70 | 50–60 | 1.2–8 |
| 20–30 | 60–70 | 1.2–5 |
| 30–40 | 60–70 | 1.2–5 |
| 40–50 | 60–70 | 1.2–8 |
| 50–70 | 60–70 | 1.2–8 |
| 20–30 | 70–80 | 1.5–10 |
| 30–40 | 70–80 | 1.5–10 |
| 40–50 | 70–80 | 2–10 |
| 50–70 | 70–80 | 2–10 |
| 30–40 | 80–90 | 1.5–10 |
| 40–50 | 80–90 | 2–10 |
| 50–70 | 80–90 | 2–10 |
| 70–80 | 80–90 | 2–10 |
| 20–30 | >90 | 2–10 |
| 30–40 | >90 | 2–10 |
| 40–50 | >90 | 2–10 |
| 50–70 | >90 | 2–10 |
| 70–80 | >90 | 2–10 |
| 80–90 | >90 | 2–10 |
Available forms: Straight Tube, Coil
Note: The dimensions above describe the tube cross-section. Other dimensions, tube lengths and custom configurations can be discussed according to the induction coil design.
Copper Grades for Induction Heating Coils
Induction heating coils require copper with high electrical conductivity because the tube itself serves as the current-carrying conductor. The tube also has an internal passage for continuous water cooling.
Common copper grades for induction coil tubing include:
| Copper Grade | Common Designations |
|---|---|
| C11000 | Cu-ETP, CW004A, T2 |
| C10200 | Cu-OF, CW008A, TU1 |
| C10100 | OFE, Cu-OFE |
Square and Flat Copper Tubes Advantages:
Square and rectangular copper tubes provide a practical cross-section for water-cooled induction coils.
High Electrical Conductivity
Copper provides the electrical conductivity required to carry the high current used in induction heating systems. A suitable tube cross-section provides the required conductive area while maintaining the desired coil geometry.
Internal Water Cooling
The hollow tube allows cooling water to flow through the conductor. This removes heat generated in the copper during continuous operation and helps maintain the operating temperature of the induction coil.
Efficient Coil Arrangement
The flat sides of square and rectangular tubes make it easier to arrange adjacent turns of a coil with controlled spacing. This is useful when the coil needs to follow a specific workpiece shape or fit within limited equipment space.
Flexible Cross-Section Selection
Different combinations of Side A, Side B and wall thickness allow the copper tube to be selected according to the required current capacity, cooling passage and coil geometry.
Suitable for Coil Forming
Square and flat copper tubes can be bent and formed into different coil configurations for heating, melting, forging and heat treatment equipment.
Copper Tube Working Principle in High- and Medium-Frequency Induction Furnaces
In an induction heating system, the copper tube is normally formed into an induction coil surrounding the workpiece or heating zone.
Alternating current passes through the copper coil and produces an alternating electromagnetic field. When a conductive workpiece is placed inside or near the coil, the changing magnetic field induces electrical currents in the workpiece, generating heat.
The copper tube performs two functions at the same time:
Electrical conductor → carries the high-frequency or medium-frequency current.
Cooling passage → carries cooling water through the coil to remove heat from the copper conductor.
The tube therefore needs to provide a suitable balance between electrical conductivity, cross-sectional area, wall thickness and cooling passage.
Applications of Copper Induction Coil Tubes
Square and flat copper tubes can be used for induction coils in various heating and thermal processing systems, including:
High-frequency induction heating equipment
Medium-frequency induction heating equipment
Induction melting furnaces
Metal forging and billet heating
Induction hardening and surface treatment
Heat treatment equipment
Brazing and soldering systems
Annealing equipment
Specialized induction heating systems
The coil geometry and copper tube dimensions are normally selected according to the workpiece shape, heating zone, operating frequency, power level and required heating pattern.
Straight Copper Tube and Coil Form
We can supply copper tubing in straight tube form or coil form depending on the requirements of the induction coil manufacturer or equipment builder.
Straight tubes can be supplied for customers who perform their own bending and coil fabrication. Coil-form tubing can be considered when continuous tube length and reduced joints are preferred during coil forming.
Available supply options can include:
Straight copper tube
Coil copper tube
Cut-to-length tube
Custom cross-sectional dimensions
Custom wall thickness
Tube supplied for subsequent coil bending
Supply Options
We supply square, rectangular and flat copper tubes for induction heating coils in commonly used high-conductivity copper grades, including C11000 and C10200, with different cross-sectional dimensions and wall thicknesses.
If you have a coil drawing, required tube cross-section, copper grade or existing tube specification, we can quote based on the required dimensions and supply condition.
