Copper Alloy 122 (C12200) – Deoxidized High Phosphorus (DHP) Copper Tubing

Copper Alloy 122 (C12200), also known as DHP Copper Tubing, is a high-performance copper alloy designed for superior thermal conductivity, corrosion resistance, and ease of fabrication.

Composed of 99.9% copper with 0.015–0.040% phosphorus, this alloy is deoxidized to improve weldability and resistance to hydrogen embrittlement – making it ideal for high-pressure, high-temperature, and corrosive environments.

Alloy C122 copper tubing is the primary alloy used in heating, cooling, and plumbing applications. Due to the small amount of phosphorus, it enhances the deoxidizing properties, making it better resistant to oxidation and other forms of corrosion.

We recently completed an export order of C12200 copper tube to Canada. The product was strictly manufactured according to ASTM B88 standard and is a large diameter, non-standard custom tube, used in the main water supply system of a local commercial building.

ASTM B88 C12200 Mill Test Certificate (MTC)

Customer Acceptance & Inspection Images

Straight Lengths:

Outer Diameter: 0.040″ to 2.625″

Wall Thickness: 0.004″ to 0.250″

Lengths: 0.125″ to 504″

Copper Coils:

Outer Diameter: 0.040″ to 0.875″

Wall Thickness: 0.005″ to 0.250″

Coil Formats:

Bunch Coils: OD 0.040″ to 0.144″

Level-Wound Coils: OD 0.156″ to 0.875″

Pancake Coils: OD 0.125″ to 0.750″

Thermal:

Cooling systems

Heat exchangers

Heat-sink components

Chemical processing

Aerospace

Defense

Fluid & Gas Lines:

Medical

Oil and gas

Distillery

Hydraulic

Refrigeration

HVAC:

Heat exchanger

Condensers

Connectors (U-bends and fittings)

Connection lines

Electrical:

Connectors

Terminals

Heat-sinks

Plumbing & Water Systems:

Water tubes

Connectors

High thermal conductivity: Ideal for heat transfer applications

Corrosion resistance: Performs well in fresh water and many industrial environments

Weldability: Deoxidized chemistry prevents hydrogen embrittlement

Fabrication ease: Suitable for bending, flaring, and tube expansion

Versatility: Available in multiple forms (straight lengths, coils) and a wide range of dimensions

Q1: What does DHP stand for in C12200 copper?
A: DHP stands for "Deoxidized High Phosphorus." It indicates that the copper has been deoxidized with a higher phosphorus content (0.015-0.040%) to remove oxygen and prevent hydrogen embrittlement during welding and brazing.

Q2: What is the difference between C12200 and standard copper?
A: Standard non-deoxidized copper (such as C11000) contains oxygen and can suffer from hydrogen embrittlement when welded. C12200 contains phosphorus as a deoxidizer, making it weldable and brazeable without cracking.

Q3: Is C12200 suitable for heat exchanger applications?
A: Yes. C12200 is widely used in heat exchangers, condensers, cooling systems, and HVAC applications due to its high thermal conductivity and good corrosion resistance in fresh water.

Q4: What is the maximum operating temperature for C12200?
A: For continuous service, C12200 is typically limited to 200°C (400°F). Above this temperature, strength decreases significantly. Short-term exposure to higher temperatures may be acceptable for processes such as brazing.

Q5: Can C12200 be used in seawater?
A: C12200 is not recommended for seawater service. While it has good corrosion resistance in fresh water, it will corrode in seawater. For seawater applications, consider cupronickel alloys such as C70600 or C71500.

Q6: What tempers are available for C12200 tubing?
A: Common tempers include annealed (soft), light drawn, and hard drawn. The specific temper affects mechanical properties such as strength and ductility. Annealed temper is recommended for bending and tube expansion.

Q7: What is the difference between ASTM B75 and ASTM B111 for C12200?
A: ASTM B75 is a general specification for seamless copper tube for engineering applications. ASTM B111 is specifically for seamless condenser and heat exchanger tubes, with tighter dimensional tolerances and additional testing requirements for heat transfer service.

Q8: Can C12200 be supplied in coils?
A: Yes. C12200 tubing is available in bunch coils, level-wound coils, and pancake coils for outer diameters up to 0.875″. Larger diameters are typically supplied as straight lengths.

Q9: What is the typical lead time for custom sizes?
A: Lead times vary depending on dimensions, quantity, and temper. Please contact us with your specific requirements for current lead times.

Q10: What testing is performed on C12200 tubing?
A: Typical testing includes chemical analysis, tensile testing, hardness testing, expansion testing, and nondestructive testing (eddy current or hydrostatic). Additional tests can be specified per customer requirements.

Q11: Is C12200 suitable for medical gas lines?
A: Yes. C12200 is used in medical gas line applications due to its cleanliness, corrosion resistance, and ability to be joined by brazing or soldering. It must meet applicable medical gas piping standards.

Q12: Do you supply C12200 tube to ASME SB111?
A: Yes. ASME SB111 is the ASME code version of ASTM B111. The chemistry and dimensions are identical. SB111 includes additional quality assurance and certification requirements for pressure vessel applications. Please specify SB111 when ordering for ASME code work.

Poor packaging destroys even the best copper heat exchanger tube. As a professional copper heat exchanger tube factory serving copper heat exchanger tube USA, Europe, UAE, Saudi Arabia, and India, we follow military-grade export packaging standards to ensure zero damage during sea or air freight.

Our Standard Packaging Process:

For U-Bundle Orders: U tube heat exchanger and U tube bundle heat exchanger are placed in dedicated steel jigs inside the crate to prevent bending radius distortion.

Our Certifications & Compliance:

ASTM B111 pdf and ASME SB111 pdf full traceability.

ISO 9001:2015 quality management system.

Third-party inspection accepted: SGS, BV, Lloyds, or TUV.

Copper heat exchanger tube life expectancy testing reports available upon request.

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