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C72900, also known as Cu-15Ni-8Sn alloy, is a high-performance copper-nickel-tin alloy favored in industrial applications for its excellent physical and mechanical properties. The following is a comprehensive introduction to C72900 alloy:
1. Material properties
The main advantages of C72900 alloy include:
· Strong resistance to shrinkage and warping: 10 times higher than BeCu, which makes it excellent during processing.
· Excellent solderability: Good resistance to intermetallic compound formation at high temperatures.
· Corrosion resistance and easy cleaning: The corrosion resistance in humid ammonia at 40°C can be maintained for more than 500 hours.
· Low initial cost and process cost: Compared with other high-performance alloys, C72900 is more cost-effective.
2. Metallurgical Process
C72900 is produced using a powder metallurgy forging process that allows the alloying elements to be evenly distributed before aging. During the aging process, the material will spontaneously undergo spinodal strengthening, a unique metallurgical process caused by submicroscopic chemical composition fluctuations. The amount of cold rolling, aging temperature and time all affect the strength and formability of C72900.
3. Chemical composition
The chemical composition of C72900 is as follows:
· Nickel (Ni): 14.5 - 15.5%
· Tin (Sn): 7.5 - 8.5%
· Copper (Cu): Balance
· Copper and specified elements: 99.90%
· Other elements: Maximum 0.10%
4. Physical Properties
Physical properties of C72900 include:
· Electrical conductivity: 7.8 % IACS at 68°F (20°C), 7.3 % IACS at 392°F (200°C).
· Thermal conductivity: 0.09 (30 x 10^3) BTU/lb°F at 68°F (J/kg K).
· Thermal conductivity: 17 - 29 BTU/ft•HR•°F at 68°F (w/m•K at 20°C).
· Coefficient of thermal expansion: 9.1 x 10^-6 In/In/°F (68°F - 572°F), 16.4 x 10^-6 Per °C (20°C - 200°C).
· Modulus of Elasticity (Tensile): 18.5 x 10^6 (127 x 10^3) Psi (MPa).
· Modulus of Rigidity: 7.5 x 10^6 (52 x 10^3) Psi (MPa).
· Density: 0.323 (8.95) Ib/in^3 (gm/cc).
5. Mechanical properties
The mechanical properties of C72900 can be adjusted by different heat treatment and cold working conditions. For example, the 0.2% yield strength of the solution heat treated state (TB00) is 25 - 45 ksi (172 - 310 MPa), while the 0.2% yield strength of the age hardened state (TS04) can reach 155 - 185 ksi (1069 - 1275 MPa). These properties make C72900 suitable for applications that require high strength and good formability.
6. Application areas
Due to its excellent properties, C72900 alloy is widely used in industries such as aerospace, automotive, defense, medical, electronics, oil and gas, and nuclear energy. In particular, C72900 performs well in applications that require high strength, corrosion resistance, and excellent thermal stability.
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