What is the machinability of Inconel 625?
Inconel 625 has a very low machinability rating, typically around 12-17% on the AISI Index (compared to free-cutting steel at 100%), making it a challenging superalloy to machine due to rapid work-hardening, high cutting forces, and significant tool wear. It requires specialized, sharp tools (carbide, ceramics), slow speeds, high feeds, positive rake angles, and efficient cooling (MQL, cryogenic) to manage heat and chip removal, leading to higher costs and longer production times.
What is the optimal cutting speed for Inconel 625?
For Inconel 625, optimal cutting speeds vary by operation but generally start low and increase with tooling, with recommended turning speeds around 60-80 m/min (200-260 SFM), milling at 45-60 m/min (150-200 SFM), and even faster speeds with advanced tools like ceramics, emphasizing high rigidity, generous depth of cut, slower feeds, and effective cooling to manage heat and work hardening.
Inconel 625 Machinability
Inconel 625 Turning / Facing
| Parameter | Recommended Range |
|---|---|
| Cutting Speed | 30–60 m/min |
| Feed Rate | 0.05–0.25 mm/rev |
| Depth of Cut | 0.5–2 mm |
| Tool Material | Carbide, PCD, or CBN coated |
| Coolant | High-pressure, flood cooling recommended |
Inconel 625 Drilling
| Parameter | Recommended Range |
|---|---|
| Cutting Speed | 8–20 m/min |
| Feed Rate | 0.05–0.15 mm/rev |
| Drill Material | Solid carbide or cobalt high-speed steel |
| Coolant | Flood cooling or mist |
Inconel 625 Milling
| Parameter | Recommended Range |
|---|---|
| Cutting Speed | 20–40 m/min |
| Feed per Tooth | 0.05–0.15 mm/tooth |
| Depth of Cut | 0.5–1.5 mm |
| Tool Material |
Carbide end mills with TiAlN coating |
Inconel 625 Machining Challenges
|
Challenge |
Mitigation |
|---|---|
| Rapid tool wear | Use carbide or PCD tools, apply coatings, and maintain proper coolant |
| Work hardening | Use light cuts and avoid dwell on the same spot |
| Surface finish defects | Optimize feed rate and tool sharpness |
| Heat concentration | High-pressure coolant or interrupted cutting |
Procurement Insight:Understanding these challenges helps buyers select suppliers experienced with Inconel 625 machining, reducing production delays and rework.
Inconel 625 suppliers
At GNEE, Inconel 625 is available in various forms to meet diverse industrial needs:
Plates and Sheets (cold rolled and hot rolled)
Bars and Rods (round, square, hexagonal)
Tubes (seamless and welded)
Wires and Strips (for springs, fasteners, electrical applications)
Forgings and Custom Parts (according to drawings or specifications)
Testing and Documentation: Mill Test Certificates, EN 10204 3.1, Chemical Reports, Mechanical Reports, Destructive Testing Reports, Non-Destructive Testing Reports, PMI Test Reports, Visual Inspection Reports, Third-Party Inspection Reports, NABL Certified Laboratory Reports.
Packaging: Wooden crates, bubble wrap, steel strapping, or packaged according to customer requirements.
