C5191

C5191 is a phosphor bronze alloy, known for its good workability, fatigue resistance, corrosion resistance, and elasticity, making it suitable for springs and electrical components.

Chemical Composition

• Copper (Cu): Balance (typically ~93-95%)

• Tin (Sn): 5.5 – 7.0%

• Phosphorus (P): 0.03 – 0.35%

• Zinc (Zn): ≤0.30%

• Iron (Fe): ≤0.10%

• Lead (Pb): ≤0.05%

• Total copper and additions: ≥ 99.5%

Mechanical Properties

• Tensile Strength (TS):

  • Annealed (O): ≥315 N/mm²

  • Quarter Hard (1/4H): 390 – 510 N/mm²

  • Half Hard (1/2H): 490 – 610 N/mm²

  • Hard (H): 590 – 685 N/mm²

  • Extra Hard (EH): ≥635 N/mm²

• Elongation: 8% – 42% depending on temper

• Hardness (Hv): Approximately 90 – 210, depending on temper

Physical Properties

• Melting Point: About 900 – 1045°C

• Density: Around 8.8 g/cm³

• Coefficient of Thermal Expansion: 18.5 × 10⁻⁶ /°C

• Electrical Conductivity: About 13 – 15% IACS

• Thermal Conductivity: ~38 Btu·ft/(hr·ft²·°F)

Applications

• Electrical connector springs and terminals

• Mechanical springs and flexible metal hoses

• Bearings and wear-resistant components

• Marine and chemical industry parts requiring corrosion resistance

• Contacts in electrical and electronic devices

Key Features

• High mechanical strength with excellent elasticity

• Good corrosion and wear resistance

• Suitable for cold and hot working, welding, and machining

• Popular choice for connectors, switches, and springs due to good electrical conductivity and mechanical properties