LG2 /CC491K
CC491K / LG2 is the most commonly used leaded gunmetal offering excellent machining properties and a very good wear resistance. It is a medium strength alloy with good pressure tightness, is resistant to dezincification and offers a reasonable corrosion resistance in sea water and brine.
CC491K / LG2 is mainly utilised for pump and valve components (bodies and fittings) and is ideally suited for bearings having light loads and low to medium speeds under adequate lubrication or for very light duty gears when loading is negligible.
Related Standards
|
BS1400 LG2 |
CC491K |
|
C83600 |
CuSn5Pb5Zn5 |
Chemical Composition (nominal)
|
Copper |
85.0% |
|
Tin |
5.0% |
|
Lead |
5.0% |
|
Zinc |
5.0% |
|
Phosphorus |
0.025% |
|
Others |
0.5% max |
Mechanical Properties (Minima all sizes Continuous Cast)
|
UTS |
270 N/mm2 |
|
0.2% Proof Strength |
100 N/mm2 |
|
Elongation |
13% |
|
Hardness |
75 HB |
Key Features
- High wear resistance
- Excellent Machinability
- Good pressure tightness
Typical Physical Properties
|
Melting Point |
1010°C |
|
Density |
8.83 g/cm³ |
|
Thermal conductivity (RT) |
71.9 W/m°K |
|
Thermal expansion coefficient (20-200°C) |
18 x 10-6 / ?C |
|
Electrical conductivity |
15% IACS |
|
Modulus of Elasticity |
93 GPa |
Fabrication Properties
|
Hot Formability |
Not Recommended |
|
Cold Formability |
Not Recommended |
|
Machinability rating (free cutting brass = 100) |
85% |
|
Stress Relieving Temp. Range |
260°C (1hr per inch thickness) |
|
Maximum operating temperature |
230°C |
Joining Methods
|
Soldering |
Excellent |
|
Brazing |
Good |
|
Oxy-acetylene welding |
Not recommended |
|
Gas-shielded arc welding |
Not recommended |
Typical Uses
LG2 / CC491K has traditionally been utilised for valve bodies, gears, bearings, valve bodies, pump trim and other general engineering components requiring good machinability and good wear resistance.
This technical information is given by John Hood & Co.without charge and the user shall employ such information at their own discretion and risk. For more detailed technical advice on temper selection, fabrication, joining, machining, physical and mechanical data please contact us as space does not permit the listing of every feature of the material.