General Information for Cast Iron GGG-80
||K - Cast Iron
MACHINABILITY OF GGG-80 CAST IRON
GGG-80 is a nodular cast iron material with a machinability rating of 63% and hardness 283 HB.
Nodular cast iron is a popular sub-group since it provides a good balance between the extremely brittle grey cast iron and the more ductile malleable type.
In cast iron, the material standards also define the allowed hardness range, and hardness is the top-ranking factor affecting the machinability ratings. For example, nodular cast iron is known to be harder to machine compared with grey cast iron. However, if a grey cast iron alloy has a hardness of 300HB is will have lower machinability than nodular cast iron with 200HB.
Cast iron is very brittle and produces short chips. Therefore, there is no need for a sharp cutting edge, and a strong geometry with a large honing or K-land is the best choice.
For general turning of Cast Iron GGG-80 at stable conditions use a grade with a very hard substrate and CVD coating.
In case you are running at a cutting speed that is lower than 490 SFM (150 m/min), it is better to use a grade with a very hard substrate and PVD coating.
For general milling use a grade with a semi hard substrate and CVD coating.
For detailed carbide grades recommendations, check the table below.
Recommended Cutting speed range for turning at stable conditions is 410 - 540 [SFM] / 125 - 165 [m/min].
Consider using CBN inserts. Although they cost more than twice, they enable increasing the cutting speed by 2-4 times (relative to carbide).
Recommended Cutting speed range for milling with stable clamping and short overhang is 280 - 360 [SFM] / 85 - 110 [m/min]
For detailed cutting speed recommendations, check the table below.
Equivalent International Designations for Cast Iron GGG-80
Chemical Composition for Cast Iron GGG-80
Cutting Speeds Recomendations for Grey cast iron GGG-80
Important! The speed estimation is given for an ideal situation:
- Most suitable carbide grade
- Stable tool clamping
- Stable workpiece clamping
- Good quality raw material
- A short overhang of the cutting tool.
- Nominal hardness of the material.
Recommended Carbide Grades for Cast Iron GGG-80
Grade for Milling (Indexable)
Recommended Insert Cutting Edge Geometry for Cast Iron GGG-80
||0.05-0.10 mm / 0.002-0.004"
||0.30-0.40 mm / 0.012-0.016"