General Information for Steel 8620
| Material Group |
P-Steel |
| Sub-Grou |
Low Alloy Steel |
| Tensile Strengt |
510-710[N/mm^2] |
| Machinability |
66% |
MACHINABILITY OF 8620 STEEL
Steel 8620 is a low-alloy steel with a carbon content of 0.2% and additional 2.1% content of manganese, chromium, nickel, and molybdenum. (See details in the table below). Steel 8620 has a machinability rating of 66%.
Low alloy steels are very popular in machine shops. The small amount of alloying elements enhances their mechanical properties and hardenability without a significant sacrifice in terms of machinability.
SUMMARY:
For general turning of Steel 8620 at stable conditions use a grade with a 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 Hard substrate and PVD coating.
For general milling,use a grade with a Semi-hard substrate and thin PVD coating.
For detailed carbide grades recommendations,check the table below.
Recommended Cutting speed range for turning at stable conditions is 800 - 1100 [SFM] / 245 - 335 [m/min]
Recommended Cutting speed range for milling with stable clamping and short over hang is 510 - 670 [SFM] / 155 - 205 [m/min]
For detailed cutting speed recommendations,check the table below.
Equivalent International Designations for Steel 8620
| Standard |
Name |
| SAE |
8620 |
| WNR |
1.6523 |
| DIN |
21NiCrMo2 |
| BS |
805M20 |
| SS |
2506 |
| ANFOR |
20NCD2 |
| UNI |
20NiCrMo2 |
| UNF |
20NiCrMo2 |
| JS1 |
SNCM220(H) |
Chemical Composition for Steel 8620
| Element |
Amount |
| Manganese(Mn) |
.70-.90% |
| Nickel(Ni) |
.40-.70% |
| Chromium(Cr) |
.40-.60% |
| Carbon(C) |
.18-.23% |
| Molybdenum(Mo) |
.15-.25% |
Cutting Speeds Recomendations for Low Alloyed Steel (Alloying elements less then 8%)
| Application |
VC(m/min) |
Vc(SFM) |
| Turning |
245-335 |
800-1100 |
| Milling |
155-205 |
510-670 |
| Parting |
120-160 |
390-520 |
| Grooving |
140-185 |
460-610 |
| Drilling |
100-135 |
330-440 |
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 8620
Grade for Milling (Indexable)
Recommended Insert Cutting Edge Geometry for Steel 8620
| 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" |
