General Information for Steel 1040
Material Group |
P - Steel |
Sub-Grou |
Low Carbon Steel |
Tensile Strengt |
580-800 [N/mm^2] |
Machinability |
70% |
MACHINABILITY OF 1040 STEEL
Steel 1040 is a Carbon Steel material with 0.4% carbon content. Carbon steels range in carbon content between 0.08% to 1%. The machinability is very sensitive to the amount of carbon. Materials with little carbon content (below 0.15%) are too soft and gummy, and materials with a carbon content above 0.5% are harder and thus have lower machinability
Since Steel 1040, has 0.4%, it is relatively easy to machine with a good hardness/mildness balance and a machinability rating of 70%.
SUMMARY:
For general Turning of Steel 1040 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 1040
Standard |
Name |
SAE |
1040 |
WNR |
1.0511 |
DIN |
C40 |
BS |
080M40 |
SS |
1311 |
ANFOR |
1C40/AF60C40 |
UNI |
C40/1C40 |
UNF |
F.114.A |
Chemical Composition for Steel 1040
Element |
Amount |
Manganese (Mn) |
.60-.90% |
Carbon (C) |
.37-.44% |
Sulfur (S) |
0.05% |
Phosphorus (P) |
0.04% |
Cutting Speeds Recomendations for Steel 1040
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 1040
Grade for Milling (Indexable)
Recommended Insert Cutting Edge Geometry for Steel 1040
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" |