C12200 DHP Copper

Q1: What is the difference between C12200 and C11000?
A: C12200 contains 0.013-0.040% phosphorus for deoxidation, making it resistant to hydrogen embrittlement during brazing and welding. C11000 contains oxygen and cannot be brazed in reducing atmospheres. For plumbing, heat exchangers, and medical gas lines where brazing is required, C12200 is the standard. C11000 has higher conductivity (100% IACS vs 79-85% IACS).

Q2: What is DHP copper?
A: DHP stands for "Deoxidized High Phosphorus." It is the common name for C12200, referring to the 0.013-0.040% phosphorus added to remove oxygen from the copper melt. DHP is the term used in European and Asian markets. C12200 is the UNS designation. Both refer to the same material.

Q3: Is C12200 suitable for potable water systems?
A: Yes, C12200 complies with NSF/ANSI/CAN 61 Appendix G for potable water systems, provided the water pH is ≥6.5. Copper's natural antimicrobial properties also help maintain water quality. It is widely used for residential and commercial water supply lines, as well as medical gas delivery pipelines.

Q4: What is the difference between ASTM B88 and ASTM B152 for C12200?
A: ASTM B88 covers seamless copper water tube (Types K, L, M) for plumbing and water service. ASTM B152/B152M covers copper sheet, strip, plate, and rolled bar for general engineering applications. Both use C12200 material. B88 is for tube products; B152 is for flat products. Choose based on product form needed.

Q5: What is the electrical conductivity of C12200?
A: C12200 has electrical conductivity of approximately 79-85% IACS (depending on standard). The phosphorus added for deoxidation reduces conductivity from 100% IACS (pure copper). For plumbing and heat exchanger applications, this is acceptable. For high-conductivity electrical applications, use C11000 or C10200 instead.

Q6: What is the thermal conductivity of C12200?
A: C12200 has thermal conductivity of 340 W/(m·K) at room temperature. This is slightly lower than pure copper (about 390 W/m·K) but still excellent. High thermal conductivity makes it ideal for heat exchangers, condenser tubes, air conditioning coils, and other thermal equipment where efficient heat transfer is required.

Q7: Can C12200 be welded?
A: Yes, C12200 can be welded using inert gas shielding (TIG/MIG). Because it is deoxidized with phosphorus, it is not susceptible to hydrogen embrittlement. Oxyacetylene welding is also possible. For plumbing and HVAC, brazing is more common than welding. C11000 cannot be welded in reducing atmospheres due to oxygen content.

Q8: What is the maximum operating temperature for C12200?
A: C12200 should not be used for prolonged periods above 200°C (392°F) in oxidizing atmospheres. At high temperatures, oxidation accelerates. For continuous high-temperature service, consider other alloys. C12200 performs well in reducing atmospheres but is not recommended for high-temperature oxidizing environments. For brazing (short-term), it is fine.

Q9: Does C12200 require annealing after cold working?
A: Yes, periodic annealing at 500-600°C is required to restore ductility after heavy cold working. Cold working hardens the material and reduces elongation. Annealing softens it, allowing further forming. For progressive drawing operations, intermediate anneals are necessary. For light forming, annealing may not be required.

Q10: What is the difference between C12200 and TP2 copper?
A: TP2 is the Chinese GB/T standard grade for phosphorus-deoxidized copper. It is equivalent to C12200. Both contain 0.013-0.040% phosphorus and minimum 99.85-99.90% copper. TP2 is commonly used for plumbing and HVAC tubes in China. C12200 and TP2 are interchangeable, though certification standards differ.

Q11: What are the mechanical properties of C12200?
A: C12200 has density of 8.94 g/cm³, melting point of 1083°C, elastic modulus of 132 GPa, and thermal expansion of 17.6 × 10⁻⁶/K. Tensile strength varies by temper: annealed (O) ~220-260 MPa, hard drawn (H) ~310-350 MPa. Elongation for annealed material is typically 45% or higher.

Q12: What are the typical applications for C12200 tube?
A: Typical applications include: potable water systems (NSF-certified), refrigeration equipment (AC coils, heat exchangers), automotive fuel lines and radiator components, medical gas delivery pipelines, HVAC piping, and gas pipelines. C12200 is also used for condenser tubes and evaporators in thermal equipment.

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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.

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