General Information for Steel 4150
| Material Group |
P-Steel |
| Sub-Grou |
Low Alloy Steel |
| Tensile Strengt |
1100-1300[N/mm^2] |
| Machinability |
61% |
MACHINABILITY OF 4150 STEEL
Steel 4150 is a low-alloy steel with a carbon content of 0.5% and additional 2.1% content of manganese, chromium, and molybdenum. (See details in the table below). Steel 4150 has a machinability rating of 61%.
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 4150 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 740 - 1020 [SFM] / 225 - 310 [m/min].
Recommended Cutting speed range for milling with stable clamping and short over hang is 460 - 620 [SFM] / 140 - 190 [m/min]
For detailed cutting speed recommendations,check the table below.
Equivalent International Designations for Steel 4150
| Standard |
Name |
| SAE |
4150 |
| WNR |
1.7228 |
| DIN |
41CrMo4 |
| BS |
708A47 |
| ANFOR |
50CrMo4 |
| JS1 |
SCM445(H) |
Chemical Composition for Steel 4150
| Element |
Amount |
| Chromium(Cr)) |
.80-1.10% |
| Manganese(Mn) |
.75-1.00% |
| Carbon(C) |
.40-.45% |
| Molybdenum(Mo) |
.15-.25% |
Cutting Speeds Recomendations for Steel 4150
| Application |
Vc (m/min) |
Vc (SFM) |
| Turning |
225-310 |
740-1020 |
| Milling |
140-190 |
460-620 |
| Parting |
110-150 |
360-490 |
| Grooving |
125-170 |
410-560 |
| Drilling |
90-125 |
300-410 |
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.
General Information for Steel 4150
| Material Group |
P - Steel |
| Sub-Grou |
Low Carbon Steel |
| Tensile Strengt |
340-690 [N/mm^2] |
| Machinability |
55% |
MACHINABILITY OF 4150 STEEL
Steel 4150 is a Low Carbon Steel material with 0.1% carbon content. Most Carbon steels have between 0.08% to 1% carbon content. The machinability is very sensitive to the amount of carbon since carbon directly influences the hardness of steel. The "Sweet Spot" that yields the highest rating is 0.2%-0.3%.
Since Steel 4150 has a low carbon content, it is very soft. Thus, it is almost impossible to break the chips, and a "build up edge" ( BUE) is easily formed on the cutting edge.and a "build-up edge" ( BUE) is easily formed on the cutting edge. Therefore, although Its machinability rating is 55%, it's a problematic material to machine. It is best to cut Steel 4150 with a sharp cutting edge to reduce the built-up edge.
You can find here a list of machinability Ratings for different Carbon Steels.
Summary:
For general turning of Steel 4150 at stable conditions,use a grade with a rigid substrate and CVD coating.
If you are running at a cutting speed lower than 490 SFM (150 m/min), using a grade with a hard substrate and PVD coating is better.
Hard substrate and PVD coating.
For general milling, use the 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 670 - 900 [SFM] / 205 - 275 [m/min].
Recommended cutting speed range for milling with stable clamping and short over hang is 410 - 560 [SFM] / 125 - 170 [m/min]
For detailed cutting speed recomendations, check the Below Table.
Equivalent International Designations for Steel 4150
| Standard |
Name |
| SAE |
4150 |
| WNR |
1.0037 |
| DIN |
St37 |
| BS |
Fe360B/144937/23HR |
| SS |
1311 |
| ANFOR |
E24-2 |
| UNI |
Fe360B;C;D |
| UNF |
AE235B/Fe360B |
| JS1 |
STKM12A;C |
Chemical Composition for Steel 4150
| Element |
Amount |
| Manganese (Mn) |
0.25-0.40% |
| Carbon (C) |
Max 0.08% |
| Sulfur (S) |
Max 0.05% |
| Phosphorus (P) |
Max 0.04% |
Cutting Speeds Recomendations for Steel 4150
| Application |
Vc (m/min) |
Vc (SFM) |
| Turning |
205-275 |
670-900 |
| Milling |
125-170 |
410-560 |
| Parting |
100-135 |
330-440 |
| Grooving |
115-155 |
380-510 |
| Drilling |
80-110 |
260-360 |
Important! The speed estimation is given for an ideal situation:
- Most suitable carbide grade
- Stable tool clamping
- Stableworkpiece clamping
- Goodqualityraw material
- Ashort overhangof the cutting tool.
- Nominalhardnessof the material.
- etc.
Recommended Carbide Grades for Steel 4150
Grade for Milling (Indexable)
Recommended Insert Cutting Edge Geometry for Steel 4150
| 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" |
