General Information for Stainless Steel 347
| Material Group |
M - Stainless Steel |
| Sub-Group |
Austenitic Stainless Steel |
| Tensile Strength |
510-740[N/mm^2] |
| Machinability Range |
36% |
MACHINABILITY OF 347 STAINLESS STEEL
Stainless Steel 347 is an austenitic stainless steel alloy with 18% chromium and 11% nickel.
It is a chromium-nickel stainless with the addition of niobium and tantalum. The additions of these two elements eliminate carbide precipitation and improve corrosion resistance. Stainless Steel 347 has very low machinability rating of 36%.
SUMMARY:
For general Turning of Stainless Steel 347 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 440 - 590 [SFM] / 135 - 180 [m/min].
Recommended Cutting speed range for milling with stable clamping and short overhang is 280 - 380 [SFM] / 85 - 115 [m/min]
For detailed cutting speed recomendations, check the table below.
Equivalent International Designations for Stainless Steel 347
| Standard |
Name |
| SAE |
347 |
| WNR |
1.4550 |
| DIN |
X10CrNiNb18-9 |
| UNS |
UNS S34700 |
| BS |
347S17, 58F |
| SS |
2338 |
| ANFOR |
Z6CNNb18.10 |
| UNI |
X6CrNiNb18 11 |
| UNF |
F.3552;F.3524 |
| JS1 |
SUS347 |
Chemical Composition for Stainless Steel 347
| Element |
Amount |
| Chromium (Cr) |
18% |
| Nickel (Ni) |
11% |
| Silicon (Si) |
0.75% |
| Manganese (Mn) |
2.00% |
| Carbon (C) |
0.08% |
| Phosphorus (P) |
0.05% |
| Sulfur (S) |
0.03% |
Cutting Speeds Recomendations for Stainless Steel 347
| Application |
Vc (m/min) |
Vc (SFM) |
| Turning |
135-180 |
440-590 |
| Milling |
85-115 |
280-380 |
| Parting |
55-70 |
180-230 |
| Grooving |
80-110 |
260-360 |
| Drilling |
40-50 |
130-160 |
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 347
Grade for Milling (Indexable)
Recommended Insert Cutting Edge Geometry for Stainless Steel 347
| Honing Size |
0.03-0.05 mm / 0.001-0.002" |
| Rake Angle |
9°-11° |
| Land Angle |
Positive |
| Land Widt |
0.20-0.30 mm / 0.008-0.012" |
