UNS C70260 is a copper-nickel alloy widely used in various industries, including marine, aerospace, and power generation. This alloy has excellent corrosion resistance, high strength, and good thermal conductivity, making it a popular material for various applications. This article will examine the composition, physical and mechanical properties, and uses of UNS C70260. Additionally, we’ll explore this alloy’s hardness, heat treatment, welding, and corrosion resistance aspects.
UNS C70260 Composition
UNS C70260 is a copper-nickel alloy that contains 10% nickel and 2.6% iron. This alloy also includes small amounts of other elements like manganese, silicon, and chromium. The presence of nickel enhances the corrosion resistance of the alloy, while iron improves its strength and hardness. This alloy is known by its trade name, Copper Alloy 706, and is commonly used for marine applications due to its seawater corrosion resistance.
| Elements | Content (%) |
|---|---|
| Nickel, Ni | 1.0-3.0 |
| Silicon, Si | 0.20-0.7 |
| Phosphorus, P | 0.01 |
| Copper, Cu | Remainder |
UNS C70260 Physical Properties
UNS C70260 has a density of 8.94 g/cm3 and a melting point of 1170-1240°C. This alloy has excellent thermal and electrical conductivity, making it an ideal material for electrical conductors and heat exchangers. Additionally, this alloy exhibits good strength and hardness, which make it suitable for various industrial applications.
UNS C70260 Mechanical Properties
UNS C70260 has excellent mechanical properties, including high tensile strength, yield strength, and elongation. The tensile strength of this alloy ranges from 500-620 MPa, while the yield strength ranges from 180-400 MPa. The elongation of this alloy ranges from 10-35%, which describes the material’s ability to deform before breaking.
| Temper | Thickness | Tensile Str. | Elong. | Rockwell | Fatigue Str. | |||
|---|---|---|---|---|---|---|---|---|
| B | C | F | 30T | |||||
| H04 | 0.5MPa (0.02in) | 483MPa (70ksi) | 4% | – | – | – | – | – |
| H08 | 0.5MPa (0.02in) | 669MPa (97ksi) | 6% | – | – | – | – | 241MPa (35ksi) |
UNS C70260 Uses
UNS C70260 is widely used in various industries, including marine, aerospace, power generation, and chemical processing. In the marine industry, this alloy is used for piping systems, heat exchangers, and desalination equipment. This alloy is used in aerospace for engine components, landing gear systems, and hydraulic lines. This alloy is used for heat exchangers and steam turbine components in power generation. Additionally, this alloy is used in chemical processing for handling corrosive materials.
UNS C70260 Hardness
UNS C70260 has a Brinell hardness of 130-150, which measures the material’s resistance to indentation. The hardness of this alloy can be increased by cold working, heat treatment, or a combination of both.
UNS C70260 Heat Treatment
UNS C70260 can be heat treated to increase its strength and hardness. The recommended heat treatment for this alloy is solution annealing at 870-920°C for 30-60 minutes, followed by water quenching. This heat treatment process improves the alloy’s mechanical properties and makes it suitable for high-stress applications.
UNS C70260 Welding
UNS C70260 can be welded using various welding processes, including gas tungsten arc welding, gas metal arc welding, and shielded metal arc welding. This alloy requires preheating and post-weld heat treatment to avoid cracking and improve the weld’s strength. The recommended preheat temperature is 150-200°C, and the post-weld heat treatment is 600-650°C for 2-3 hours.
UNS C70260 Corrosion Resistance
UNS C70260 has excellent corrosion resistance properties, particularly in seawater and acidic environments. This alloy is resistant to pitting corrosion, stress corrosion cracking, and crevice corrosion. Additionally, this alloy exhibits good resistance to erosion and cavitation, making it an ideal material for marine applications.
Conclusion:
UNS C70260 is a copper-nickel alloy with excellent mechanical and corrosion resistance properties. This alloy is widely used in various industries, including marine, aerospace, power generation, and chemical processing. Understanding the composition, physical and mechanical properties, and other aspects of UNS C70260 can help us select the appropriate material for different applications. With its many outstanding qualities, UNS C70260 is a material we can rely on for many years.
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