ALLOY LG2 - LEADED GUNMETAL

Chemical Composition - percent

 
 
         
  Element     Nominal
  Tin Sn Sn 4.0 - 6.0 4.4
  Lead Pb Pb 4.0 - 6.0 5.5
  Zinc Zn Zn 4.0 - 6.0 5.5
  Nickel Ni Ni 1.0 maximum  
  Iron Fe Fe 0.30 maximum  
  Aluminium Al 0.005 maximum  
  Antimony Sb 0.25 maximum  
  Copper Cu Balance  
 
 
Total Impurities 0.80 maximum

Mechanical Properties [Typical] Continuous Cast Centrifugal Cast
  0.2% Proof Stress 120 Mpa (17,400 psi) 120 Mpa (17,400 psi)
  Ultimate Tensile Strength 300 Mpa (43,500 psi) 270 Mpa (39,000 psi)
  Elongation 20% 20%
  Typical Hardness 75 BHN 75 BHN
       
       
Compressive Strength 0.1% Permanent Set 100 Mpa (15,000 psi)
       
  Specific Gravity 8.8
 
  Machinability Rating 84 (Free Machining Brass=100)
  Max. Operating Temperature 230oC (450oF)
 
  Stress Relieving Temperature 260oC (500oF)
 
  Time at Temperature 1 hour per 25mm of section thickness
     
Comparative Specifications
 
BS1400 - LG2; AS1565 83600; ASTM B505 & B271 - 83600; SAE 40;
JIS (Japan) H5111 - BC6; DIN (Germany) 1705 - RG5; ISO 1338 - CuPb5Sn5Zn5