Introduction

• C18080 (CuCrAgFeTiSi) is a heat-treatable copper alloy, designated as K88 by Wieland, and is known for its outstanding properties. Composed primarily of copper (Cu) with the addition of chromium (Cr), silver (Ag), iron (Fe), titanium (Ti), and silicon (Si), this alloy’s carefully designed composition endows it with high strength, high hardness, excellent corrosion resistance, and oxidation resistance. It exhibits exceptional performance, particularly in terms of electrical conductivity and stress resistance at elevated temperatures.
• Electrical Conductivity: C18080 exhibits high electrical conductivity at 392°F (about 200°C), making it suitable for electrical applications.
• Stress Resistance: This alloy has good stress resistance, maintaining stable performance under high loads and at elevated temperatures.
• Heat Treatment: The alloy can be further strengthened and hardened through heat treatment, making it suitable for high-strength applications.
• Formability: C18080 has excellent formability, accommodating various processing methods, including both cold and hot working.
• Corrosion Resistance: Its composition allows for good performance in corrosive environments, making it suitable for marine and chemical applications.

Chemical Composition

• Cr: 0.2%~0.7%
• Ag: 0.01%~0.3%
• Fe: 0.02%~0.2%
• Ti: 0.01%~0.15%
• Si: 0.01%~0.1%
• Cu: Remainder

Alloy Standard

• ASTM: C18080——ASTM B936
• DIN: CuCrAgFeTiSi
• EN: CuCrAgFeTiSi
• Wieland: K88 _{is a trademark licensed by Wieland}

Physical Properties

• Density: 8.92 g/cm³
• Electrical conductivility: 79 IACS%(20°C)*(value for the lowest temper class)
• Modulus of elasticity: 140 GPa
• Coefficient of thermal expansion: 17.6 10^-6/K
• Thermal conductivity: 320 W/(m*K)

Mechanical Properties

Application

• Electronics: Suitable for high-conductivity components in electronic and electrical integrated circuits, power transistors, electrical connectors, switches, and plugs.
• Aerospace: Ideal for aerospace components due to its high-temperature resistance and stress endurance.
• Automotive Industry: Widely used in automotive electrical systems, such as switches, to meet the demands for high strength and conductivity.

Thermal stress relaxation

• The alloy can maintain stress stability under prolonged loading conditions. Even during heating and cooling cycles, C18080 retains stable performance, ensuring a longer service life in demanding applications. Its thermal stress relaxation properties prevent significant deformation or loss of strength during extended high-temperature use.