1. Is C17200 in the annealed (soft) state or hardened state?
Annealed (Soft) State: This is the most common default state for C17200 when supplied without specific hardening requirements. It undergoes annealing (heating to ~780-820°C followed by slow cooling) to relieve internal stresses, resulting in a soft, ductile structure. This state is ideal for applications requiring forming, bending, or machining (e.g., electrical connectors, precision components).
Hardened State: C17200 can be hardened through two primary processes:
Cold Working: Plastic deformation (e.g., rolling, drawing) at room temperature increases hardness and strength (e.g., half-hard, full-hard tempers).
Age Hardening (Precipitation Hardening): A two-step process (solution annealing + aging at ~315-345°C) that achieves the highest hardness and wear resistance. This is common for high-performance applications (e.g., springs, valves, tooling).
2. What is the hardness of C17200?
3. What is the corresponding Chinese material grade for C17200?
Standard Alignment: GB/T 5231-2012 is the authoritative Chinese standard for wrought copper alloys, directly corresponding to ASTM B194/B194M (the U.S. standard for C17200).
Chemical Composition Match: Both C17200 and QBe2 have identical core chemical components:
Beryllium (Be): 1.80–2.10%
Cobalt (Co): 0.20–0.50%
Copper (Cu): Remainder (≥97%)
When communicating with Chinese manufacturers or customers, reference "QBe2 (GB/T 5231)" as the direct equivalent of C17200. This ensures material consistency in quotations, purchase orders, and technical specifications.
