General Information for Steel 1055
| Material Group |
P-Steel |
| Sub-Grou |
High Carbon Steel |
| Tensile Strengt |
640-830[N/mm^2] |
| Machinability |
60% |
MACHINABILITY OF 1055 STEEL
Steel 1055 is a high-carbon steel material with 0.6% 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 very low 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 1055, has 0.6%, it is relatively more challenging to machine compared with average carbon steel and has a machinability rating of 60%.On the other hand, it is stronger and has better mechanical properties. High carbon steels are less popular since when better mechanical properties are required, the better choice is alloy steels.
SUMMARY:
For general turning of Steel 1055 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 - 1000 [SFM] / 225 - 305 [m/min].
Recommended cutting speed range for milling with stable clamping and short overhang is 460-620[SFM]/140-190[m/min].
For detailed cutting speed recommendations, check the table below.
Equivalent International Designations for Steel 1055
| Standard |
Name |
| SAE |
1055 |
| WNR |
1.1203 |
| DIN |
Ck55 |
| BS |
070M55 |
| ANFOR |
XC55 |
| UNI |
C50 |
| UNF |
C55K |
| JS1 |
S55C |
Chemical Composition for Steel 1055
| Element |
Amount |
| Manganese (Mn) |
.60-.90% |
| Carbon(c) |
.50-.60% |
| Sulfur(S) |
0.05% |
| Phosphorus(P) |
0.04% |
Cutting Speeds Recomendations for Steel 1055
| Application |
Vc (m/min) |
Vc(SFM) |
| Turning |
225-305 |
740-1000 |
| Milling |
140-190 |
460-620 |
| Parting |
105-145 |
340-480 |
| Grooving |
125-170 |
410-560 |
| Drilling |
90-120 |
300-390 |
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 1055
Grade for Milling (Indexable)
Recommended Insert Cutting Edge Geometry for Steel 1055
| 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" |
