1. Material standard and composition
Description of brand name:
Chinese standard (GB/T 5231-2012): TP2 (phosphorus deoxidized copper, phosphorus content 0.015-0.040%).
International counterpart: C12200 in American Standard ASTM B280, phosphorus content 0.015-0.040%. Oxygen content ≤ 0.007%.
C12200 composition requirements (ASTM B280):
Copper (Cu) Phosphorus (P) Oxygen (O) Total other impurities
≥99.90% 0.015-0.040% ≤0.007% ≤0.1%
2. Physical and Mechanical Properties
Parameter C12200 Typical Comparison TP1 (C12000) Comparison Common Copper (T2)
Density (g/cm³) 8.94 8.94 8.92
Electrical Conductivity (IACS, 20°C) 80-85% 85-90% 98
Thermal conductivity (W/(m-K)) 310 320 380
Tensile strength (soft state, MPa) 220-280 200-250 180-220
Elongation (soft state, %) ≥40 ≥45 ≥35
Corrosion resistance (salt spray test) ＞72 h (ASTM B117) ＞48 h ＞24 h
3. Core Advantages
Refrigerant compatibility:
Chlorine ion corrosion resistance: adaptable to fluorine-containing refrigerants (such as R32, R410A), corrosion rate <0.01 mm/year (ASTM G59).
Pressure resistance: Burst pressure of 0.5 mm wall thickness copper tube ≥ 20 MPa (GB/T 17791).
Processing performance:
Cold bending molding: minimum bending radius of 1.5D (D is the diameter of the pipe), no cracking (ASTM B743).
High-frequency welding: weld strength ≥ 95% of the base material, suitable for continuous production lines (speed 15-30 m/min).
Economical:
The price is 15-20% lower than oxygen-free copper (TU1), suitable for air conditioners, refrigerators and other high-volume refrigeration equipment.
4. Typical application scenarios
Refrigeration system:
Air conditioner refrigerant tube: outer diameter Φ6.35-Φ12.7 mm, pressure resistance ≥4.2 MPa (GB/T 17791).
Refrigerator evaporator coil: wall thickness 0.4-0.6 mm, low temperature (-40°C) impact resistance, life>10 years.
Heat pump and automobile air conditioning:
Heat pump condenser piping: high temperature (120°C) water-oxygen corrosion resistance, leakage rate <1×10-⁶ Pa-m³/s.
New energy vehicle refrigerant pipe: vibration fatigue resistance (10⁷ cycles without cracks).
Industrial refrigeration:
Chiller copper tube: wall thickness 0.5-1.0 mm, seawater corrosion resistance (add inner wall corrosion-resistant coating).
Cold storage evaporator: surface hydrophilic treatment (contact angle <10°), enhance heat transfer efficiency by 15%.
5. Processing and treatment guidelines
Molding process:
Cold-drawn tube: drawing speed 5-10 m/min, surface roughness Ra≤0.8 μm (ISO 4287).
Flaring/Flanging: no cracks at 30% flaring rate, suitable for quick-connect fittings (e.g. SAE J2196).
Welding process:
High frequency welding: frequency 300-450 kHz, welding temperature 950-1050°C, argon gas protection.
Brazing: silver-based brazing material (BAg-5), brazing temperature 650-750°C, joint strength ≥ 200 MPa.
Surface treatment:
Passivation treatment: nitric acid - chromic acid passivation, surface resistance <0.05 mΩ (inhibit electrochemical corrosion).
Coated epoxy resin: coating thickness 10-20 μm, resistant to refrigerant penetration (ASTM D543).
