Grade Designation
| Standard | Designation |
|---|---|
| UNS Number | C12200 |
| Common Name | Phosphorus Deoxidized Copper (DHP Copper) |
| EN Symbol | Cu-DHP |
| GNEE Supply Form | Tube, Sheet, Strip, Bar, Wire |
Applicable Standards (Including ASTM B111)
| Standard | Scope |
|---|---|
| ASTM B111 | Seamless copper and copper-alloy heat exchanger tubes (condensers, evaporators) |
| ASTM B152/B152M | Copper sheet, strip, plate, and rolled bar |
| ASTM B88 | Seamless copper water tube (Types K, L, M) |
| ASTM B75 | Seamless copper tube for general applications |
| NSF/ANSI/CAN 61 | Drinking water system safety certification |
| GB/T 1176-1987 | Cast copper alloys (reference only) |
For heat exchanger applications, ASTM B111 is the primary standard. GNEE supplies C12200 tubes fully certified to ASTM B111.
Product Features
| Feature | Description |
|---|---|
| High Purity & Conductivity | Copper content ≥99.85%, conductivity up to 79% IACS |
| Excellent Workability | Good cold and hot workability, no hydrogen embrittlement – suitable for drawing, welding, and brazing |
| Corrosion Resistance | Performs well in reducing atmospheres; not recommended for high-temperature oxidizing environments (>200°C) |
| Superior Thermal Conductivity | ~339-340 W/m·K – ideal for heat exchangers, condenser tubes, and thermal equipment |
| Eco-Friendly | Complies with NSF/ANSI/CAN 61 Appendix G – suitable for potable water systems (pH ≥6.5) |
Chemical Composition
| Element | Cu | P | Fe | Pb | Total Impurities |
|---|---|---|---|---|---|
| Content (%) | ≥99.85 | 0.015 – 0.040 | ≤0.05 | ≤0.005 | ≤0.15 |
Physical Properties
| Property | Value |
|---|---|
| Density | 8.94 g/cm³ |
| Melting Point | 1083°C (1981°F) |
| Electrical Conductivity | 79% IACS |
| Thermal Conductivity | ~340 W/m·K (corrected from source error) |
| Coefficient of Thermal Expansion | 17.6 × 10⁻⁶/K |
| Elastic Modulus | 132 GPa |
ASTM B111 Compliance for Heat Exchanger Tubes
For C12200 tubes used in heat exchangers, condensers, and evaporators, ASTM B111 requires:
| Parameter | ASTM B111 Requirement for C12200 |
|---|---|
| Chemical Composition | Cu ≥ 99.85%, P 0.015–0.040% |
| Tensile Strength (O61 temper) | 30–45 ksi (205–310 MPa) |
| Yield Strength (O61, 0.5% ext.) | 10–15 ksi (69–103 MPa) |
| Elongation (in 2″ or 50mm) | ≥ 35% |
| Flattening Test | No cracks after flattening |
| Expansion Test | No cracks after 30% expansion |
| Hydrostatic Test | Leak-free at specified pressure |
GNEE provides traceable mill test reports (MTR) for all C12200 tubing supplied to ASTM B111.
Available Forms & Dimensions (GNEE Supply)
| Form | Thickness / Diameter Range | Width / Length | Typical Applications |
|---|---|---|---|
| Sheet / Strip | 0.3 – 50 mm | Max width 2000 mm | Heat exchangers, architectural components |
| Bar | Ø15 – 150 mm | Custom lengths | Mechanical parts, connectors |
| Tube (ASTM B111) | OD: 1/8″ – 2″ (3.2mm – 50.8mm) | Custom lengths | Heat exchangers, condensers, HVAC |
| Tube (ASTM B88) | OD: 1/4″ – 8″ (K/L/M/DW types) | Custom lengths | Potable water, medical gas lines |
| Wire | Ø0.5 – 12 mm | Custom lengths | Electrical wiring, springs |
Key Advantages of GNEE's C12200
| Advantage | Description |
|---|---|
| High Reliability | Oxygen-free copper matrix reduces oxidation risk, extending service life |
| Processing Flexibility | Supports cold/hot rolling, welding, brazing, and bending |
| Eco-Compliance | NSF-certified for potable water and medical gas delivery |
| Cost-Effectiveness | More economical than oxygen-free copper while maintaining balanced performance |
| Full ASTM B111 Certification | Certified for heat exchanger and condenser service with MTR available |
Applications
| Industry | Specific Uses |
|---|---|
| Heat Exchange Systems | Condensers, evaporators, shell-and-tube heat exchangers (ASTM B111) |
| Electrical & Electronics | Wires, connectors, switch components, bus bars |
| Plumbing & Water Systems | Potable water lines (ASTM B88, NSF-certified), medical gas pipelines |
| HVAC & Refrigeration | Air conditioning coils, refrigeration lines, HVAC tubing |
| Industrial Manufacturing | Hydraulic components, precision springs, wear-resistant parts |
| Construction & Transportation | Gas pipelines, railway parts, marine equipment |
Processing Guidelines for C12200
| Process | Recommendation |
|---|---|
| Welding | Inert gas shielding (TIG/MIG) recommended to prevent high-temperature oxidation |
| Brazing | Excellent for tube-to-tube sheet joints (standard for heat exchangers) |
| Cold Working | Periodic annealing (500–600°C) required to restore ductility |
| Surface Treatment | Use non-abrasive cleaners to avoid chemical corrosion |
| Environmental Limits | Avoid prolonged use in oxidizing atmospheres or high temperatures >200°C (for continuous service) |
FAQ
1. What is the difference between C12200 under ASTM B111 vs ASTM B88?
ASTM B111 C12200 is for seamless heat exchanger tubes with stringent flattening, expansion, and hydrostatic tests. ASTM B88 C12200 is for plumbing water tubes (Types K, L, M) with different dimensional tolerances. For condensers and heat exchangers, ASTM B111 is required.
2. Does C12200 comply with ASTM B111 for use in shell-and-tube heat exchangers?
Yes, C12200 is listed in ASTM B111 as an approved alloy. It requires ≥99.85% Cu, 0.015–0.040% P, ≥35% elongation, and must pass flattening/expansion tests in the O61 (annealed) temper.
3. What is the correct thermal conductivity of C12200?
The correct value is ~339-340 W/m·K (not 3.0 W/m·K as found in some erroneous sources). This makes C12200 one of the best thermal conductors among engineering alloys, ideal for heat exchangers.
4. What is the difference between C12200 and C11000 (ETP copper)?
C12200 (DHP) contains 0.015-0.040% phosphorus for deoxidation, making it weldable and brazeable. C11000 (ETP) has higher electrical conductivity (100% IACS vs 79% IACS) but cannot be welded due to hydrogen embrittlement risk.
5. What temper of C12200 is required under ASTM B111 for U-bend condensers?
O61 (annealed) is the only temper permitted. Annealed tubes can be bent to 1.5x-2x OD and expanded into tube sheets without cracking. Hard drawn (H80) is not allowed under ASTM B111.
6. What is the equivalent European standard for C12200 under EN 12451?
Cu-DHP (EN CW024A) under EN 12451 is the direct European equivalent to ASTM B111 C12200. Both cover seamless heat exchanger tubes with nearly identical requirements.
7. Is C12200 certified for potable water systems?
Yes, C12200 complies with NSF/ANSI/CAN 61 Appendix G for drinking water systems, provided water pH is ≥6.5. GNEE can supply ASTM B88 C12200 tubes with NSF certification upon request.
8. What is the maximum operating temperature for C12200 in ASTM B111 service?
C12200 can be used continuously up to ~200-300°C (392-572°F) in heat exchanger service. Above 300°C, creep and oxidation accelerate. For higher temperatures, consider C70600 (copper-nickel).
9. What is the difference between C12200 and C14200 for heat exchanger applications?
C12200 (Cu-DHP) contains 0.015-0.040% phosphorus – standard for most heat exchangers. C14200 (arsenical copper) contains 0.15-0.50% arsenic for improved corrosion resistance in ammoniacal environments. For most water and steam applications, C12200 is sufficient.
10. What is the yield strength requirement for C12200 under ASTM B111?
ASTM B111 specifies a yield strength of 10–15 ksi (69–103 MPa) for C12200 in the O61 temper (0.5% extension under load). This ensures the tube can be expanded into tube sheets without cracking.
11. How can I get a certified mill test report for C12200 to ASTM B111 from GNEE?
GNEE provides traceable mill test reports (MTR) for all C12200 tubing supplied to ASTM B111. The report includes: chemical analysis, tensile results (yield/ultimate/elongation), flattening/expansion test results, hydrostatic test pressure, and heat number. Contact GNEE sales with your size, temper (O61), and quantity requirements.
Our copper product packaging
Our copper products are carefully packed using strong wooden cases, moisture-proof paper, plastic caps for tube/pipe ends, and steel strapping to ensure protection during long-distance sea or air freight.
Each layer is separated with foam or plastic spacers to prevent scratching and deformation, while standard export seaworthy packaging meets ISPM-15 requirements. Clear product labels (grade, size, quantity, heat number) are attached to each bundle or coil, and additional anti-tarnish paper is added for high-humidity destinations to guarantee that the copper tubes, sheets, rods, wires, and strips arrive in perfect condition at your warehouse.
Factory Description – Production Lines & Testing Equipment
Key Equipment for Copper Tube Line
For C12200 copper tubes, we operate advanced piercing mills, plug mills, draw benches, and coil winding machines, capable of producing both straight lengths and pancake coils with smooth inner surfaces and tight tolerances.
Testing & Inspection Equipment
Our in-house quality control center is equipped with:
Optical emission spectrometer – for chemical composition analysis
Universal tensile testing machine – for tensile strength and elongation
Hardness tester (Rockwell & Vickers) – for material hardness verification
Eddy current flaw detector – for surface and subsurface defect inspection
Metallographic microscope – for grain structure and microstructure analysis
Leakage tester (air under water) – for tube airtightness testing
Micrometer and laser diameter gauge – for precise outer diameter measurement
