General Information for Steel 5140
| Material Group |
P-Steel |
| Sub-Grou |
Low Alloy Steel |
| Tensile Strengt |
700-750[N/mm^2] |
| Machinability |
70% |
MACHINABILITY OF 5140 STEEL
Steel 5140 is a low-alloy steel with a carbon content of 0.4% and additional 1.6% content of manganese, chromium. (See details in the table below). Steel 5140 has a machinability rating of 70%.
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 5140 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 850 - 1160 [SFM] / 260 - 355 [m/min].
Recommended Cutting speed range for milling with stable clamping and short overhang is 520-720[SFM]/160-220[m/min]
For detailed cutting speed recommendations,check the table below.
Equivalent International Designations for Steel 5140
| Standard |
Name |
| SAE |
5140 |
| WNR |
1.7035 |
| DIN |
41Cr4 |
| BS |
530M40 |
| ANFOR |
42C4 |
| UNI |
41Cr4 |
| UNF |
42Cr4 |
| JS1 |
SCr440(H) |
Chemical Composition for Steel 5140
| Element |
Amount |
| Manganese(Mn) |
.70-.90% |
| Chromium(Cr) |
.70-.90% |
| Carbon(C) |
.38-.43% |
Cutting Speeds Recomendations for Steel 5140
| Application |
VC(m/min) |
Vc(SFM) |
| Turning |
260-355 |
850-1160 |
| Milling |
160-220 |
520-720 |
| Parting |
125-170 |
410-560 |
| Grooving |
145-200 |
480-660 |
| Drilling |
105-140 |
340-460 |
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 5140
Grade for Milling (Indexable)
Recommended Insert Cutting Edge Geometry for Steel 5140
| 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" |
