General Information for Cast Iron GG30
Material Group |
K - Cast Iron |
Sub-Group |
Cast Iron |
Hardness |
230.0 HB |
Tensile Strength |
760 [N/mm^2] |
Machinability Range |
104% |
MACHINABILITY OF GG30 CAST IRON
GG30 is a Grey cast iron material with a machinability rating of 104% and hardness 230 HB.
Grey cast Iron is the most brittle cast iron sub-group. It is the easiest to machine and produces tiny chips even when using a flat insert without a chip breaker.
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.
SUMMARY:
For general turning of Cast Iron GG30 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 670 - 900 [SFM] / 205 - 275 [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 overhang440 - 610 [SFM] / 135 - 185 [m/min]
For detailed cutting speed recommendations, check the table below.
Equivalent International Designations for Cast Iron GG30
Standard |
Name |
SAE |
A48-45B |
WNR |
0.6030 |
DIN |
GG30 |
BS |
Grade 300 |
SS |
130-00 |
ANFOR |
Ft30D |
UNI |
G30 |
UNF |
FG30 |
JS1 |
FC30 |
Chemical Composition for Cast Iron GG30
Sorry, Not Availble for this Material
Cutting Speeds Recomendations for Grey cast iron - Pearlitic/Ferritic
Application |
Vc (m/min) |
Vc (SFM) |
Turning |
205-275 |
670-900 |
Milling |
135-185 |
440-610 |
Parting |
100-140 |
330-460 |
Grooving |
140-190 |
460-620 |
Drilling |
115-155 |
380-510 |
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.
- etc.
Recommended Carbide Grades for Cast Iron GG30
Grade for Milling (Indexable)
Recommended Insert Cutting Edge Geometry for Cast Iron GG30
Honing Size |
0.05-0.10 mm / 0.002-0.004" |
Rake Angle |
0° -0° |
Land Angle |
Negative |
Land Width |
0.30-0.40 mm / 0.012-0.016" |