General Information for Steel 8740
| Material Group |
P-Steel |
| Sub-Grou |
Low Alloy Steel |
| Tensile Strengt |
690-930[N/mm^2] |
| Machinability |
70%-84% |
Equivalent International Designations for Steel 8740
| Standard |
Name |
| SAE |
8740 |
| WNR |
1.6546 |
| DIN |
40NiCrMo22 |
| BS |
311Type7 |
| UNI |
40NiCrMo2(KB) |
| UNF |
40NiCrMo2 |
| JS1 |
SNCM240 |
Chemical Composition for Steel 8740
Sorry, Not Availble for this Material
Cutting Speeds Recomendations for Low Alloyed Steel (Alloying elements less then 8%)
| Application |
VC(m/min) |
Vc(SFM) |
| Turning |
305-370 |
1000-1210 |
| Milling |
190-230 |
620-750 |
| Parting |
145-175 |
480-570 |
| Grooving |
170-205 |
560-670 |
| Drilling |
125-145 |
410-480 |
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 Steel 8740
Grade for Milling (Indexable)
Recommended Insert Cutting Edge Geometry for Steel 8740
| Honing Siz |
0.05-0.08 mm / 0.002-0.003" |
| Rake Angl |
11° -13° |
| Land Angl |
Positive |
| Land Widt |
0.20-0.30 mm / 0.008-0.012" |
