Bronze / Gunmetal
Bronze / Gunmetal are Copper alloy based materials with addition of;
- Tin (Sn)
- Lead (Pb)
- Zinc (Zn)
- Nickel
These materials are also known as Leaded Gunmetal, Steam or Valve Bronze, Composition Bronze or Ounce Metal
Common Material Specifications
Cu Sn5 Pb5 Zn5
- ASTM B62 =UNS C83600
- BS1400: LG2
- EN1982: CC491K
Cu Sn7 Pb3 Zn2
- BS1400 LG4
- EN1982 CC492K
Cu Sn7 Pb1.5 Zn4
- ASTMB61 = UNS C92200
Typical Properties
- Tensile 200-250 N/mm2
- Yield 90-100 N/mm2
- Elongation 13- 24%
- Hardness HB60
- Density 8.8 g/cm3
- Good castability, non-magnetic, excellent bearing material, easy machining, good impact values
- PT Rating B16.24-2006 / EN1759-3:2003
- 15.5 bar for Class 150
Corrosion Properties
- Good for seawater service
- Especially good for slow flow, general corrosion and crevice corrosion
- Excellent fouling resistance
Additional Uses & Comments
- Non-sparking, excellent impact properties, good for Oxygen and cryogenic applications
- Non-magnetic
- Good thermal and electrical conductivity
- Castabilty allows consistent thin sections
- Excellent bearing material
Cautions
- Poor weldability
- Low modulus of elasticity, low yield stress
- Avoid raised face flanges!
- Beware pressure ratings
- Limited high temperature use
