General Information for Stainless Steel 17-4PH
| Material Group |
M - Stainless Steel |
| Sub-Group |
Austenitic Stainless Steel |
| Tensile Strength |
<1380 [N/mm^2] |
| Machinability Range |
45% |
MACHINABILITY OF 17-4PH STAINLESS STEEL
17-4PH (AISI Type 630) is a martensitic chromium-nickel stainless steel containing precipitation-hardening elements such as copper, niobium, and tantalum.
Its cracks resistance, corrosion resistance, and strength are better than the regular martensitic chromium-type stainless steel (400 series).
It is used in applications requiring high strength and a modest level of corrosion resistance. For example, pump shafts, oil & gas components, and mechanical seals
The machinability of 17-4PH depends on its hardness. In 'condition A' (the most commonly supplied) it has a machinability rating of 45% (similar to 420), however, in many cases, it is machined after heat treatment, and the machinability becomes much lower.
| Hardness (HB) |
Hardness (HRC) |
Machinability (%) |
| 250 (Condition A) |
24 |
45% |
| 300 |
32 |
39% |
| 350 |
38 |
32% |
SUMMARY:
For general Turning of Stainless Steel 17-4PH at stable conditions use a grade with a Semi Hard substrate and Thin CVD coating.
In case you are running at a cutting speed that is lower than 390 SFM (120 m/min), it is better to use a grade with a Semi 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 540 - 740 [SFM] / 165 - 225 [m/min].
Recommended cutting speed range for milling with stable clamping and short over hang is 340 - 460 [SFM] / 105 - 140 [m/min]
For detailed cutting speed recomendations, check the Below Table.
Equivalent International Designations for Stainless Steel 17-4PH
| Standard |
Name |
| sae |
630 |
| wnr |
1.4542 |
| din |
X5CrNiCuNb16-4 |
| uns |
UNS S17400 |
| anfor |
Z6CNU17.04 |
| js1 |
SUS 630 |
Chemical Composition for Stainless Steel 17-4PH
| Element |
Amount |
| Chromium (Cr) |
16.3% |
| Nickel (Ni) |
4% |
| Copper (Cu) |
4% |
| Silicon (Si) |
0.50% |
| Manganese (Mn) |
0.50% |
| Carbon (C) |
0.04% |
| Phosphorus (P) |
0.02% |
| Sulfur (S) |
0.02% |
Cutting Speeds Recomendations for Stainless steel - Martensitic
| Application |
Vc (m/min) |
Vc (SFM) |
| Turning |
165-225 |
540-740 |
| Milling |
105-140 |
340-460 |
| Parting |
65-90 |
210-300 |
| Grooving |
100-135 |
330-440 |
| Drilling |
50-65 |
160-210 |
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 Stainless Steel 17-4PH
Grade for Milling (Indexable)
Recommended Insert Cutting Edge Geometry for Stainless Steel 17-4PH
| Honing Size |
0.03-0.05 mm / 0.001-0.002" |
| Rake Angle |
9°-11° |
| Land Angle |
Positive |
| Land Width |
0.20-0.30 mm / 0.008-0.012" |
