Overview
T1 Copper is a high-purity commercial copper grade widely used in the Chinese market and standardized under GB/T copper standards. It is equivalent to C11000 (ETP Copper) and is known for its excellent combination of electrical conductivity, thermal conductivity, corrosion resistance, ductility, formability, and cost-effectiveness.
T1 copper contains a minimum copper content of approximately 99.95%, making it suitable for a wide range of electrical, thermal, architectural, and industrial applications.
T1 copper is widely used in:
- Electrical Busbars
- Conductive Components
- Transformer Parts
- Heat Exchangers
- Copper Plates
- Electrical Connectors
- Power Distribution Equipment
- Industrial Copper Fabrications
Due to its excellent conductivity and broad availability, T1 is one of the most commonly used copper grades in China and international manufacturing markets.
Material Specification
| Property | Value |
|---|---|
| Material Designation | T1 Copper |
| Chinese Standard | GB/T 5231 |
| Material Family | Pure Copper |
| Copper Purity | ≥99.95% |
| Density | 8.94 g/cm³ |
| Magnetic Property | Non-Magnetic |
| Typical Supply Condition | Annealed, Half-Hard, Hard |
| Standard Forms | Plate, Sheet, Bar, Rod, Tube, Wire, Busbar |
Chemical Composition
| Element | Content (%) |
|---|---|
| Copper + Silver (Cu+Ag) | ≥99.95 |
| Bismuth (Bi) | ≤0.001 |
| Antimony (Sb) | ≤0.002 |
| Arsenic (As) | ≤0.002 |
| Iron (Fe) | ≤0.005 |
| Lead (Pb) | ≤0.005 |
| Sulfur (S) | ≤0.005 |
| Oxygen (O) | Controlled |
The high copper purity ensures outstanding conductivity and excellent processing performance.
Mechanical Properties
Annealed Condition
| Property | Value |
|---|---|
| Tensile Strength | 200–250 MPa |
| Yield Strength | 50–90 MPa |
| Elongation | 40–50% |
| Hardness | 40–65 HB |
| Elastic Modulus | 117 GPa |
Cold Worked Condition
| Property | Value |
|---|---|
| Tensile Strength | 300–450 MPa |
| Yield Strength | 250–400 MPa |
| Hardness | 80–130 HB |
Physical Properties
| Property | Value |
|---|---|
| Density | 8.94 g/cm³ |
| Melting Point | 1083°C |
| Thermal Conductivity | 385–395 W/m·K |
| Electrical Conductivity | ≥100% IACS |
| Electrical Resistivity | 0.0172 μΩ·m |
| Thermal Expansion Coefficient | 16.8 × 10⁻⁶/K |
| Specific Heat Capacity | 385 J/kg·K |
Electrical Conductivity
| Material | Conductivity (% IACS) |
|---|---|
| T1 Copper | 100+ |
| T2 Copper | 100 |
| C110 Copper | 100 |
| Aluminum 6061 | 40 |
| Brass C360 | 28 |
T1 provides excellent conductivity for power transmission and electrical equipment manufacturing.
Thermal Conductivity
| Material | Thermal Conductivity (W/m·K) |
|---|---|
| T1 Copper | 385–395 |
| T2 Copper | 390 |
| C110 Copper | 390 |
| Aluminum 6061 | 167 |
| Stainless Steel 304 | 16 |
The excellent thermal conductivity makes T1 suitable for cooling systems and heat transfer equipment.
Corrosion Resistance
| Environment | Performance |
|---|---|
| Indoor Environment | Excellent |
| Dry Atmosphere | Excellent |
| Fresh Water | Excellent |
| Marine Atmosphere | Good |
| Salt Water | Moderate |
| Industrial Environment | Good |
T1 develops a stable oxide layer that protects the surface from further corrosion.
Recommended surface treatments:
- Tin Plating
- Silver Plating
- Nickel Plating
- Gold Plating
- Electropolishing
- Passivation
Weldability
| Welding Process | Rating |
|---|---|
| TIG Welding | Excellent |
| MIG Welding | Excellent |
| Resistance Welding | Excellent |
| Brazing | Outstanding |
| Soldering | Outstanding |
T1 copper is highly suitable for electrical and conductive joining applications.
Machinability
| Process | Rating |
|---|---|
| CNC Turning | Good |
| CNC Milling | Fair |
| Drilling | Good |
| Grinding | Good |
| Stamping | Excellent |
| Forming | Excellent |
Machinability Comparison
| Material | Machinability |
|---|---|
| Brass C360 | Excellent |
| T1 Copper | Fair |
| T2 Copper | Fair |
| C110 Copper | Fair |
| Aluminum 6061 | Excellent |
Because of its ductility, machining requires sharp tooling and proper chip control.
Heat Treatment
Stress Relief Annealing
| Parameter | Value |
|---|---|
| Temperature | 200–300°C |
| Cooling Method | Air Cool |
Full Annealing
| Parameter | Value |
|---|---|
| Temperature | 400–650°C |
| Cooling Method | Air Cool |
Heat Treatability
| Property | Performance |
|---|---|
| Hardening by Heat Treatment | No |
| Cold Work Strengthening | Yes |
| Annealing Response | Excellent |
Like other pure copper grades, T1 cannot be strengthened through conventional heat treatment.
International Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| GB/T (China) | T1 |
| ASTM (USA) | C11000 (Closest Equivalent) |
| UNS | C11000 |
| EN (Europe) | Cu-ETP |
| DIN (Germany) | CW004A |
| JIS (Japan) | C1100 |
| ISO | Cu-ETP |
Available Forms
| Product Type | Availability |
|---|---|
| Sheet | Yes |
| Plate | Yes |
| Round Bar | Yes |
| Flat Bar | Yes |
| Tube | Yes |
| Wire | Yes |
| Busbar | Yes |
| Copper Foil | Yes |
Typical Applications
Electrical Industry
- Busbars
- Power Connectors
- Switchgear Components
- Transformer Windings
Electronics Industry
- Conductive Parts
- Electrical Contacts
- Grounding Components
- RF Components
Thermal Management
- Heat Exchangers
- Heat Sinks
- Cooling Plates
- Thermal Conductors
Power Industry
- Distribution Equipment
- Power Transmission Components
- Renewable Energy Systems
Construction Industry
- Roofing Materials
- Architectural Panels
- Decorative Components
General Engineering
- Copper Fabrications
- Conductive Assemblies
- Industrial Components
Manufacturing Characteristics
| Manufacturing Process | Rating |
|---|---|
| CNC Machining | Good |
| Stamping | Outstanding |
| Deep Drawing | Outstanding |
| Welding | Excellent |
| Brazing | Outstanding |
| Soldering | Outstanding |
| Electroplating | Excellent |
Advantages
Excellent Electrical Conductivity
Ideal for electrical and power applications.
Outstanding Thermal Conductivity
Suitable for cooling and heat transfer systems.
High Copper Purity
Provides reliable electrical performance.
Excellent Formability
Suitable for complex stamping and forming operations.
Good Corrosion Resistance
Performs well in most industrial environments.
Cost Effective
Provides excellent performance at reasonable cost.
Limitations
Moderate Machinability
More difficult to machine than brass.
Lower Strength Than Copper Alloys
Pure copper prioritizes conductivity over mechanical strength.
Soft Material
May deform under heavy mechanical loading.
Limited Wear Resistance
Not recommended for abrasive environments.
Comparison with Other Copper Grades
| Property | T1 | T2 | C110 | C102 |
|---|---|---|---|---|
| Copper Purity | ≥99.95% | ≥99.90% | ≥99.90% | ≥99.95% |
| Conductivity | Excellent | Excellent | Excellent | Excellent |
| Oxygen Content | Low | Moderate | Moderate | Very Low |
| Cost | Higher | Moderate | Moderate | Higher |
| Vacuum Applications | Good | Limited | Limited | Excellent |
Comparison with Conductive Materials
| Material | Electrical Conductivity | Thermal Conductivity |
|---|---|---|
| T1 Copper | ≥100% IACS | 385–395 W/m·K |
| T2 Copper | 100% IACS | 390 W/m·K |
| C110 Copper | 100% IACS | 390 W/m·K |
| Aluminum 6061 | 40% IACS | 167 W/m·K |
| Stainless Steel 304 | 2% IACS | 16 W/m·K |
Available Surface Finishes
Raw Finishes
- Mill Finish
- Bright Finish
- Annealed Finish
Functional Finishes
- Precision Machined Finish
- Polished Finish
- Brushed Finish
Conductive Finishes
- Tin Plating
- Silver Plating
- Gold Plating
- Nickel Plating
Frequently Asked Questions (FAQ)
What is T1 copper?
T1 is a high-purity copper grade under Chinese standards with excellent electrical and thermal conductivity.
What is T1 copper used for?
Typical applications include:
- Busbars
- Electrical Connectors
- Transformers
- Heat Exchangers
- Conductive Components
What is the equivalent material to T1?
Common equivalents include:
- C11000
- Cu-ETP
- CW004A
- C1100
What is the difference between T1 and T2 copper?
| Property | T1 | T2 |
|---|---|---|
| Copper Purity | Higher | Slightly Lower |
| Conductivity | Slightly Higher | Excellent |
| Cost | Higher | Lower |
Is T1 suitable for electrical applications?
Yes. T1 is widely used in power transmission and electrical equipment manufacturing.
Can T1 copper be welded?
Yes. T1 offers excellent weldability, brazability, and solderability.
Why is T1 used in electrical systems?
Because it combines:
- High Electrical Conductivity
- Excellent Thermal Conductivity
- Good Corrosion Resistance
- Excellent Formability
Is T1 better than T2?
For applications requiring slightly higher purity and conductivity, T1 is generally preferred.
Does GCNOV provide custom manufacturing services for T1 copper?
Yes. GCNOV provides:
- CNC Machining
- Copper Busbar Fabrication
- Electrical Component Manufacturing
- Surface Plating
- Precision Copper Parts
- Prototype Development
- Low-Volume Production
- Mass Production