Material Selection Guide for Gears
Material Selection Guide for Gears |
Iron Grade |
Metallurgical Characteristics |
Best Suited For Applications Requiring. |
Examples |
G1A Gray Iron |
pearlite & ferrite matrix, flake graphite |
moderate strength, increased machinability, excellent damping |
pump gears, air compressors, screws |
G2 Class 40 Gray Iron |
pearlite matrix, flake graphite |
moderate strength, good wear as-cast, excellent damping |
balance shaft gears, lightly loaded drive gears, large printing press gears |
G2 Heat Treated Gray Iron |
martensitic matrix, flake graphite |
best wear in a non-alloyed ferrous metal, moderate strength, tooth sections >.250", good damping |
same as above, better wear resistance |
Alloyed G2 Gray iron |
pearlite or martensitic matrix, alloyed carbides, flake graphite |
improved wear over class 40 grade or quench and tempered class 40 grade; increased wear resistance with higher chrome levels. |
most automotive gray iron gears |
65-45-12 Ductile Iron |
ferrite with 20% pearlite matrix , nodular graphite |
good machinability, size control after heat treatment |
balance shaft gears, accessory gears, rotary screw compressor gears, non contacting pump gears |
80-55-06 Ductile Iron |
ferrite with 50% pearlite matrix, nodular graphite |
higher strength, higher hardness, increased wear; good heat treat response when flame or induction hardening |
balance shaft gears, printing press gears, rotary screw compressors, pump gears |
100-70-02 Ductile Iron |
pearlite with 15% ferrite, nodular graphite |
good wear resistance without heat treating |
balance shaft gears, printing press gears, rotary screw compressors, pump gears |
Austempered Ductile Iron |
ausferrite matrix with nodular graphite |
tensile, impact fatigue strengths, wear resistance |
highly loaded gears, transmission gears, speed reducers |
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