I. Chemical Composition of Copper Tubes (ASTM Standards)

Grade Copper (Cu) Oxygen (O) Other Elements Notes

C10100 ≥99.99% ≤0.0005% Silver (Ag) ≤0.0015%, ultra-low impurities High-purity oxygen-free copper, used in high-vacuum/low-temperature environments

C10200 ≥99.95% ≤0.001% Total impurities ≤0.03% Oxygen-free copper (OFHC), general high-conductivity applications

C11000 ≥99.90% ≤0.02% Phosphorus-free deoxidized Electrolytic tough pitch copper (ETP), common electrical conductors

C12200 ≥99.9% ≤0.015% Phosphorus (P) 0.015-0.040% Phosphorus-deoxidized copper (DHP), excellent weldability

Key Differences:

Oxygen Content: C10100 has the lowest oxygen content (≤0.0005%) to avoid hydrogen embrittlement; C12200 uses phosphorus deoxidation to enhance weldability.

Impurity Control: C10100/C10200 impose stricter limits on impurities like silver and sulfur to ensure high purity.

II. Mechanical Properties Comparison (Typical Values)

Grade Condition Tensile Strength (MPa) Yield Strength (MPa) Elongation (%) Hardness (HV)

C10100 Annealed 200-250 70-100 ≥40 40-60

C10200 Annealed 200-240 60-90 ≥45 35-55

C11000 Annealed 210-260 80-110 ≥35 45-65

C12200 Annealed 220-270 90-120 ≥30 50-70

Notes:

Cold Working (Hard Condition): Significantly increases strength but reduces plasticity (e.g., C10100 hard condition elongation is only 10-15%).

C12200: Slightly higher annealed strength than C10100/C10200 due to phosphorus content, but lower conductivity.