General Information for Steel P21
| Material Group |
P - Steel |
| Sub-Group |
Tool Steel |
| Tensile Strength |
850 [N/mm^2] |
| Machinability Range |
23%-55% |
Equivalent International Designations for Steel P21
| Standard |
Name |
| SAE |
P21 |
| WNR |
1.2764 |
| DIN |
X19NiCrMo4 |
Chemical Composition for Steel P21
| Element |
Amount |
| Nickel (Ni) |
3.90-4.25% |
| Chromium (Cr) |
0.50 max% |
| Cobalt (Co) |
1.05-1.25% |
| Manganese (Mn) |
0.20-0.40% |
| Silicon (Si) |
0.20-0.40% |
| Carbon (C) |
0.18-0.22% |
| Vanadium (V) |
0.15-0.25% |
Cutting Speeds Recomendations for Steel P21
| Application |
Vc (m/min) |
Vc (SFM) |
| Turning |
100-240 |
330-790 |
| Milling |
65-150 |
210-490 |
| Parting |
50-115 |
160-380 |
| Grooving |
55-135 |
180-440 |
| Drilling |
40-95 |
130-310 |
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 P21
Grade for Milling (Indexable)
Recommended Insert Cutting Edge Geometry for Steel P21
| Honing Size |
0.05-0.08 mm / 0.002-0.003" |
| Rake Angle |
11° -13° |
| Land Angle |
Positive |
| Land Width |
0.20-0.30 mm / 0.008-0.012" |
