VT machining offers CNC Milling for Incoloy 825 (UNS N08825 / 2.4858), typically supplied annealed. Mo and Cu added for sulfuric and phosphoric acid resistance.
CNC Milling Notes for Incoloy 825
We use high-efficiency toolpaths with constant engagement on Incoloy 825 to keep cutting temperature and tool wear under control.
For estimating, a 100 × 100 × 10 mm block of Incoloy 825 weighs about 0.81 kg.
Starting Parameters for CNC Milling Incoloy 825
| Cutting speed (carbide) | 25-70 m/min |
|---|---|
| Feed per tooth | 0.018-0.053 mm |
| Spindle speed, Ø10 mm end mill | 800-2230 rpm |
| Insert / tool class | ISO S — sharp PVD-coated carbide |
| Coolant | High-pressure emulsion; ceramic inserts run dry for roughing |
| Thermal growth, 100 mm part, +10 °C | 13 µm (CTE 13 µm/m·K) |
Starting values for Incoloy 825, Annealed; optimised on the first article.
Incoloy 825 Data Relevant to CNC Milling
| Equivalent designations | UNS N08825 / 2.4858 |
|---|---|
| Key composition | Ni 38-46%, Cr 19.5-23.5%, Mo 2.5-3.5%, Cu |
| Typical supply condition | Annealed |
| Hardness (typical) | ~75-90 HRB |
| Machinability rating | 20% (AISI B1112 = 100%) |
Typical values; we work to your drawing and mill certificate.
How Incoloy 825 Differs
Mo and Cu added for sulfuric and phosphoric acid resistance.
Typical applications: Oil & gas, acid production, pickling.
Incoloy 825 vs Similar Grades
| Incoloy 825 | Incoloy 800 | Hastelloy C22 | Inconel 718 | |
|---|---|---|---|---|
| Key composition | Ni 38-46%, Cr 19.5-23.5%, Mo 2.5-3.5%, Cu | Ni 30-35%, Cr 19-23%, Fe bal. | Ni bal., Cr 20-22.5%, Mo 12.5-14.5%, W 2.5-3.5% | Ni 50-55%, Cr 17-21%, Nb 4.75-5.5%, Mo |
| Hardness | ~75-90 HRB | ~75-85 HRB | ~90 HRB | Up to ~40-45 HRC aged |
| Tensile (MPa) | ~690 | ~600 | ~790 | ~1240-1400 aged |
| Machinability % | 20 | 20 | 10 | 10 |
| Typical use | Oil & gas, acid production, pickling | Heat exchangers, furnace parts | Chemical reactors, flue-gas scrubbers | Turbine discs, fasteners, oil & gas tools |
More on CNC Milling Inconel
Finishing options, quality documentation and general cnc milling guidance for all inconel grades are on our CNC Milling Inconel page.
No drawing yet? Sketch the part in our free 3D + 2D builder and send it with your RFQ.
Quoting CNC Milling Incoloy 825
Send a STEP/IGES model or PDF drawing, confirm Incoloy 825 and its condition (we usually see it supplied annealed), the quantity, critical tolerances and any finish or certificate requirements.
Incoloy 825 in Other Processes
Related
Send the drawing, the Incoloy 825 condition and the quantity — pricing and lead time come back the same or next business day.
Request a QuoteFrequently Asked Questions
What is CNC Milling Incoloy 825 and how is it done?
CNC Milling Incoloy 825 refers to multi-axis milling cutters remove material to produce prismatic features, pockets, slots and contoured 3D surfaces. Applied to Incoloy 825 — high-temperature strength and oxidation resistance — VT machining produces each part to your CAD drawing, selecting parameters from your tolerance, finish and quantity requirements.
What tolerances can you hold for CNC Milling Incoloy 825?
Achievable tolerances for Incoloy 825 machining depend on the alloy, geometry and feature size. Milling holds positional and dimensional tolerances to around ±0.01 mm, tighter with precision setups. Exact figures are confirmed against your drawing callouts.
What surface finish is achievable on Incoloy 825 with CNC Milling?
Surface finish on Incoloy 825 is controlled to your specification; we confirm the achievable Ra against your callout.
Can VT machining make custom Incoloy 825 parts to my drawing?
Yes. Incoloy 825 machining is made to order from your CAD/2D drawing. Share your geometry, material grade, tolerance and quantity and we will confirm feasibility, lead time and pricing.
Does CNC Milling Incoloy 825 require dedicated tooling?
Most Incoloy 825 machining work uses standard cutting tools and CNC programs; dedicated fixtures are made only when geometry or volume requires them.