CNC Milling for Stainless Steel 316
316 stainless steel is more challenging to mill than 304 due to its higher molybdenum content. It requires aggressive chip loads, rigid setups, and premium tooling to prevent work-hardening and achieve good results.
Recommended Machining Parameters
| Parameter | Value |
|---|---|
| Achievable Tolerances | ±0.02 mm (±0.0008") |
| Surface Finish | Ra 0.8-3.2 μm |
| Cutting Speed | 40-80 m/min (SFM 130-260) |
| Feed Rate | 0.05-0.10 mm/tooth |
| Tooling Recommendations | Premium carbide with AlTiN or nanocomposite coatings. 4-5 flute end mills with variable helix. |
Expert Machining Tips
1
Use even more aggressive feeds than 304 to stay ahead of work-hardening
2
High-pressure coolant is essential
3
Reduce depth of cut rather than feed rate
4
Program constant engagement toolpaths
5
Avoid dwelling in corners
Common Parts Made
Marine valve bodies
Surgical instrument components
Pharmaceutical mixers
Chemical pump housings
Offshore fasteners
Machining Challenges
- Extreme work-hardening
- High tool wear rate
- Gummy chip formation
- Requires premium tooling