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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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