Carbide Insert Coating Types Explained: TiAlN vs AlTiN vs CVD vs PVD (2025 Update)
Choosing the wrong carbide insert coating can cost you up to 38 % tool life and 22 % cycle-time.
This quick guide walks through the four dominant coatings-TiAlN, AlTiN, CVD and PVD-when to use them, and how to get free coated samples shipped from Cutoutool.
Why Coating Matters
Uncoated carbide begins to oxidise at 500 °C. Modern coatings raise that ceiling to 1,100 °C while reducing friction coefficient from 0.8 → 0.3. The result?
- 2–4× longer insert life
- 30-55 % higher cutting speed
- Better surface finish (Ra ≤ 0.4 µm)
1. TiAlN vs AlTiN-Composition & Colour
| Property | TiAlN | AlTiN |
|---|---|---|
| Al content | ~50 % | ~65 % |
| Max service T | 900 °C | 1,100 °C |
| Vickers hardness | 2,800 HV | 3,200 HV |
| Colour | Bronze | Violet-black |
Rule of thumb:
Steel & cast iron → TiAlN-coated TNMG332
Stainless & exotics → AlTiN-coated VCGT160408
2. CVD vs PVD-Process Video
CVD (Chemical Vapour Deposition) builds a 10-20 µm thick, triple-layer (TiN/TiCN/Al₂O₃) shield ideal for heavy roughing.
PVD (Physical Vapour Deposition) gives a smooth, thin (2-4 µm) film that prevents edge build-up-perfect for finishing aluminium.
3. Coating Selector Table
| Work-piece | Operation | Recommended coating | Cutoutool stock code |
|---|---|---|---|
| Carbon steel | Roughing | CVD TiN/TiCN/Al₂O₃ | CNMG120408-PM |
| Stainless 304 | Finishing | PVD AlTiN | VCGT160408-AL |
| Aluminium 6061 | High-speed | PVD TiB₂ (diamond-like) | CCGT09T304-GL |
4. Get Free Coated Samples in 48 h
We will laser-mark your logo and ship 10 pieces of any coated insert above-freight prepaid.
Request Free Sample →
Key Take-away
Match the coating to the material and operation, not the price. A 30 % higher insert cost can drop your cost-per-edge by half.
Need a deeper dive? Download our Insert Coating White Paper (PDF, 2 MB) or chat with an application engineer live on WhatsApp +86-138-0653-3849.
px solid #ccc;padding:8px;">Cutoutool stock code
P (steel)BlueTNMG332 M (stainless)GreenVCGT160408 K (cast iron)RedCNMG120408 N (aluminium)YellowCCGT09T304
Tip: When in doubt, go one grade tougher. For example, if you're cutting steel at high speed, use a P15 grade TNMG332 instead of P30.
Step 2: Geometry → Nose radius & chipbreaker
Geometry is a balancing act between strength and surface finish. Here's a quick picker table:
| Operation | Nose radius | Chipbreaker | Cutoutool stock code |
|---|---|---|---|
| Roughing | 0.8 mm | Heavy | CNMG120408-PM |
| Semi-finishing | 0.4 mm | Medium | VCGT160408-AL |
