C11200, belonging to the family of phosphorus deoxidized copper (DHP), is one of the most commonly used industrial pure copper materials. During the refining process, a small amount of phosphorus (P) is added to deoxidize the copper, preventing hydrogen embrittlement during high-temperature processing and welding. C112 copper offers high electrical conductivity, excellent machinability, and good corrosion resistance, which makes it suitable for a wide range of applications in heating, cooling, construction, and equipment manufacturing.

1. Chemical Composition (Typical Values)

• Copper (Cu)：≥ 99.85%

• Phosphorus (P)：0.015 – 0.040%

• Total Impurities：≤ 0.05%

• Note: Phosphorus in copper acts as a deoxidizer, preventing the formation of micro-cracks due to hydrogen gas during high-temperature processing, thus improving the welding performance and extending the material's service life.

2. Key Properties

（1）Electrical and Thermal Properties

• Electrical Conductivity: Approximately 85% IACS (compared to 100% IACS for pure copper C11000)

• Thermal Conductivity: Approximately 330 W/m·K

• Melting Point: 1083°C

• Density: 8.94 g/cm³

• While C112's electrical conductivity is slightly lower than C11000 (oxygen-free copper), its superior machinability and stability make it a better fit for welding applications.

（2）Mechanical Properties (vary based on processing state)

• R250 (Soft)

Tensile Strength (MPa)：≥ 250        Elongation (%)：≥ 35

• R420 (Hard)

Tensile Strength (MPa)：≥ 420        Elongation (%)：—

（3）Corrosion Resistance

• C112 copper demonstrates excellent resistance to water, steam, seawater, and atmospheric media, making it particularly suitable for environments with alternating hot and cold conditions.

（4）Machinability

• Excellent cold working properties (can be cold bent, flared, drawn)

• Suitable for welding and brazing with minimal risk of hydrogen embrittlement.

3. Comparison with Other Copper Materials

（1）C11200 (Phosphorus Deoxidized Copper)

• Electrical Conductivity：★★★☆☆ (85% IACS)

• Weldability：★★★★★

• Hydrogen Embrittlement Risk：Very Low

• Application Range：High

（2）C11000 (Oxygen-Free Copper)

• Electrical Conductivity：★★★★★ (100% IACS)

• Weldability：★★☆☆☆

• Hydrogen Embrittlement Risk：Moderate

• Application Range：High

（3）C12200 (DHP Copper, commonly used for tubes)

• Electrical Conductivity：★★★☆☆ (Similar to C112)

• Weldability：★★★★★

• Hydrogen Embrittlement Risk：Very Low

• Application Range：High

4. Typical Applications

（1）Building and HVAC Systems

• Water heaters, solar water heating systems

• Air conditioning and refrigeration pipelines

• Underfloor heating pipes, heat exchanger components

（2）Industrial Applications

• High-temperature pipeline systems

• Chemical equipment (with high corrosion resistance requirements)

• Copper components for welding

（3）Electrical Applications (Non-high-precision)

• Busbars, grounding copper strips

• Secondary conductor systems (when cost-performance ratio is prioritized)

5. Advantages of C112

• Excellent Weldability – Suitable for brazing, gas welding, and resistance welding, with minimal hydrogen embrittlement.

• Good Machinability – Suitable for cold working, pipe bending, stamping, flaring, and more.

• Strong Corrosion Resistance – Ideal for use in humid, oxygen-rich environments.

• Moderate Cost – More cost-effective than C11000 pure copper.

• Wide Range of Applications – Compatible with multiple industries such as construction, refrigeration, machinery, and electrical systems.

6. Conclusion

Copper alloy C112 (C11200) serves as a bridge between excellent machinability and stable performance, making it especially suitable for high-end copper applications that require welding and corrosion resistance. When electrical conductivity requirements are not at extreme levels, C112 is often a more balanced, reliable, and cost-effective solution.

Our company can process the metal into round bars, steel plates, round tubes/square tubes, and coils according to your needs. If you have any inquiries, please feel free to contact us at sale@bolaibao1.com. We look forward to your consultation.