General Information for Steel 5120
| Material Group |
P-Steel |
| Sub-Grou |
Low Alloy Steel |
| Tensile Strengt |
650[N/mm^2] |
| Machinability |
84% |
MACHINABILITY OF 5120 STEEL
Steel 5120 is a low-alloy steel with a carbon content of 0.2% and additional 1.6% content of manganese, chromium. (See details in the table below). Steel 5120 has a machinability rating of 84%.
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 5120 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 1030 - 1390 [SFM] / 315 - 425 [m/min].
Recommended Cutting speed range for milling with stable clamping and short overhang is 640 - 870 [SFM] / 195 - 265 [m/min]
For detailed cutting speed recommendations,check the table below.
Equivalent International Designations for Steel 5120
| Standard |
Name |
| SAE |
5120 |
| WNR |
1.0841 |
| DIN |
St52-3 |
| BS |
150M19 |
| SS |
2172 |
| ANFOR |
20MC5 |
| UNI |
Fe52BFN/Fe52CFN |
| UNF |
F.431 |
Chemical Composition for Steel 5120
| Element |
Amount |
| Manganese(Mn) |
.70-.90% |
| Carbon(C) |
.17-.22% |
| Chromium(Cr) |
.70-.90% |
Cutting Speeds Recomendations for Low Alloyed Steel (Alloying elements less then 8%)
| Application |
VC(m/min) |
Vc(SFM) |
| Turning |
315-425 |
1030-1390 |
| Milling |
195-265 |
640-870 |
| Parting |
150-205 |
490-670 |
| Grooving |
175-235 |
570-770 |
| Drilling |
125-170 |
410-560 |
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 5120
Grade for Milling (Indexable)
Recommended Insert Cutting Edge Geometry for Steel 5120
| 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" |
