Introduction

• C18070 (CuCrSiTi) alloy is primarily composed of copper (Cu) as the base material, with the addition of chromium (Cr), silicon (Si), and titanium (Ti) alloying elements. The precise combination of these elements gives C18070 its unique properties. It features high strength and hardness, making it suitable for high-load and high-friction environments.
• Outstanding Mechanical Properties: C18070 copper-chromium-titanium alloy has a high tensile strength, and its strength, toughness, and hardness surpass those of standard copper materials. This makes it ideal for applications involving heavy loads and high friction.
• Excellent Corrosion Resistance: With a high chromium content, C18070 forms a dense chromium oxide layer on its surface, effectively preventing oxidation and corrosion. It is highly resistant to seawater and acidic-alkaline environments, making it suitable for marine applications and environments with corrosive substances.
• Strong Weldability: C18070 alloy has excellent weldability and can be welded using various methods such as brazing, arc welding, and laser welding. It resists cracking after welding, making it suitable for welding and surface treatment needs.
• High Electrical Conductivity: C18070 copper-chromium-titanium alloy is an excellent conductor of electricity and heat. It has a high electrical conductivity and thermal conductivity, meeting the demands of high-frequency signal transmission, particularly in electronics, communications, and aerospace industries.
• Good Workability: C18070 is easy to process, including sheet metal fabrication, milling, stamping, and drawing. It also has good plasticity and forgeability, allowing it to be processed into various shapes through cold rolling, hot rolling, and other manufacturing methods.

Chemical Composition

• Cr: 0.14%~0.4%
• Ti: 0.01%~0.4%
• Si: 0.02%~0.07%
• Cu: Remainder

Alloy Standard

• ASTM: C18070
• DIN: CuCrSiTi
• EN: CuCrSiTi
• Wieland: K75 _{is a trademark licensed by Wieland}
• KME: STOL® 75 _{is a trademark licensed by} KME

Physical Properties

• Density: 8.88 g/cm³
• Electrical conductivility: 78 IACS%(20°C)*(value for the lowest temper class)
• Modulus of elasticity: 138 GPa
• Coefficient of thermal expansion: 18.0 10^-6/K
• Thermal conductivity: 310 W/(m*K)

Mechanical Properties

Application

• Electronics and Electrical Industry: Such as relays, switches, connectors, sensors, sockets, etc.
• Mechanical Parts: Suitable for components requiring strength and wear resistance, such as gears, bearings, etc.
• Heat Dissipation Components: In automotive cooling systems, this alloy can be used for heat sinks, radiators, and other parts, effectively dissipating the heat generated by high-temperature components like engines to prevent overheating and damage.
• Aerospace: Due to its high strength and temperature resistance, it can also be used in the aerospace industry.
• Other Parts: C18070 copper alloy can also be used to make motor commutators, lead frames, and other components, providing stable electrical connections and support for automotive motors and similar applications.

Thermal stress relaxation

• Excellent Resistance to Aging: The addition of chromium (Cr), silicon (Si), and titanium (Ti) elements in C18070 copper alloy allows the material to resist aging softening at high temperatures. This means that even after prolonged use at elevated temperatures, the alloy experiences minimal loss in strength and hardness, effectively maintaining its mechanical properties.
• Low Thermal Stress Relaxation Rate: Compared to other copper alloys, C18070 exhibits a lower rate of thermal stress relaxation at high temperatures. Thermal stress relaxation refers to the gradual release of internal stress in a material when exposed to a heated environment for an extended period. C18070 alloy performs well in this regard, maintaining structural stability under long-term high-temperature loads.
• Suitable for High-Temperature Applications: Due to its excellent thermal stress relaxation properties, C18070 copper alloy is especially suitable for applications that require prolonged exposure to temperature fluctuations or high-temperature environments, such as aerospace, automotive engine components, electronic devices, and electrical connectors.
• Good Fatigue Resistance: C18070 alloy is capable of resisting material fatigue caused by thermal stress relaxation after extended periods of high-temperature loading, thereby extending its service life.