LG2 /CC491C

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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 Holme Dodsworth Metals 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.

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Holme Dodsworth Metals Limited.
59/69 Heaton Park Road.
Newcastle Upon Tyne NE6 1SQ
Registered in England. Company No. 00842702