Korloy T9000 Series: Next-Generation Turning Grades
Korloy, South Korea’s leading carbide cutting tool manufacturer, introduced the T9000 series as its next-generation platform for CNC turning. The T9000 grades incorporate advanced substrate metallurgy and nano-structured coatings that deliver significant improvements in tool life, cutting speed capability, and surface finish quality. This article covers the complete T9000 lineup with detailed specifications and application guidance.
T9000 Series Technology Platform
The T9000 series is built on three core technologies:
- Gradient sintered substrate: The carbide substrate has a cobalt gradient — higher cobalt at the core for toughness, lower cobalt at the surface for hardness. This allows the insert to resist both edge chipping and crater wear simultaneously.
- Nano-composite PVD coating: A nano-structured TiAlSiN coating with grain sizes below 10 nm provides hardness exceeding 3500 HV while maintaining coating adhesion under thermal cycling.
- Post-coating surface treatment: A proprietary polishing process reduces coating surface roughness to Ra 0.05 um, minimizing friction and preventing built-up edge formation.
T9000 Grade Lineup
| Grade | ISO Class | Coating | Substrate | Speed Vc (m/min) | Primary Use |
|---|---|---|---|---|---|
| T9010 | P05-P15 | Nano TiAlSiN (PVD) | Fine-grain, 5% Co | 250-420 | High-speed finishing of steel |
| T9015 | P10-P25, M10-M20 | Nano TiAlSiN (PVD) | Fine-grain, 7% Co | 200-380 | Finish-to-medium steel and stainless |
| T9020 | P15-P30, M15-M25 | Nano AlCrSiN (PVD) | Medium-grain, 8% Co | 150-300 | General-purpose turning |
| T9025 | P20-P35, M20-M30 | Nano AlCrSiN (PVD) | Medium-grain, 10% Co | 120-260 | Medium to rough, interrupted cuts |
| T9030 | P30-P45 | Multi-layer TiAlN (PVD) | Coarse-grain, 12% Co | 80-200 | Heavy roughing, severe interruptions |
Detailed Grade Properties
| Property | T9010 | T9015 | T9020 | T9025 | T9030 |
|---|---|---|---|---|---|
| Coating hardness (HV) | 3700 | 3500 | 3300 | 3100 | 2800 |
| Coating thickness (um) | 2.5 | 3.0 | 3.5 | 4.0 | 5.0 |
| TR strength (MPa) | 2600 | 2900 | 3200 | 3500 | 3800 |
| Substrate hardness (HRA) | 92.5 | 91.8 | 91.0 | 90.2 | 89.5 |
| Oxidation resistance (C) | 950 | 920 | 900 | 880 | 850 |
Cutting Parameters: Steel Turning
Recommended starting parameters for turning AISI 1045 (200 HB) and AISI 4140 (280 HB) using CNMG 120408 inserts:
| Grade | Material | Operation | Vc (m/min) | fn (mm/rev) | ap (mm) | Tool Life |
|---|---|---|---|---|---|---|
| T9010 | AISI 1045 | Finishing | 320-400 | 0.08-0.15 | 0.2-1.0 | 70-100 min |
| T9015 | AISI 1045 | Medium | 240-320 | 0.15-0.30 | 1.0-2.5 | 50-75 min |
| T9020 | AISI 1045 | Medium | 200-280 | 0.20-0.40 | 1.5-3.5 | 45-65 min |
| T9025 | AISI 1045 | Roughing | 150-220 | 0.30-0.55 | 3.0-5.0 | 35-55 min |
| T9015 | AISI 4140 | Finishing | 200-280 | 0.10-0.20 | 0.3-1.5 | 55-80 min |
| T9020 | AISI 4140 | Medium | 170-240 | 0.20-0.35 | 1.5-3.0 | 40-60 min |
| T9030 | AISI 4140 | Roughing | 100-170 | 0.35-0.60 | 3.0-6.0 | 30-45 min |
T9000 vs Previous Korloy Grades
| Parameter | T9015 (new) | NC3225 (previous) | Improvement |
|---|---|---|---|
| Max cutting speed | 380 m/min | 300 m/min | +27% |
| Tool life (AISI 1045, Vc=250) | 65 min | 45 min | +44% |
| Surface finish at fn=0.15 | Ra 0.6 um | Ra 1.2 um | -50% (better) |
| BUE resistance (304 SS) | Excellent (no BUE at Vc>120) | BUE above fn=0.2 | Significant |
| Interrupted cut resistance | Good | Fair | Noticeable improvement |
Stainless Steel Performance
The T9000 series shows particular strength in austenitic stainless steel turning. Testing on AISI 304 at Vc=150 m/min, fn=0.2 mm/rev, ap=1.5 mm:
| Grade | Tool Life | Surface Finish | Chip Control |
|---|---|---|---|
| T9015 | 55 min | Ra 0.8 um | Short helical chips |
| T9020 | 48 min | Ra 1.0 um | Good chip breaking |
| Competing PVD Grade A | 35 min | Ra 1.6 um | Long stringy chips |
| Competing PVD Grade B | 30 min | Ra 2.0 um | Bird-nest chips |
The nano-composite coating’s low friction coefficient is the primary factor in T9000’s stainless steel advantage. It prevents the work-hardened chip from welding to the rake face, which is the leading cause of premature failure in stainless turning.
Recommended Chipbreakers for T9000
- NF chipbreaker: Finishing, ap 0.1-1.0 mm, fn 0.05-0.20 mm/rev. Sharp edge, positive rake.
- NM chipbreaker: Medium, ap 0.8-3.0 mm, fn 0.15-0.35 mm/rev. Balanced geometry.
- NR chipbreaker: Roughing, ap 2.0-6.0 mm, fn 0.25-0.55 mm/rev. Reinforced edge with negative land.
Practical Recommendations
- Use coolant for stainless steel and superalloy applications. The T9000 grades benefit from thermal stability provided by flood coolant in these materials.
- For carbon steel, dry cutting or MQL is often sufficient and can actually extend tool life by avoiding thermal shock from coolant interruptions.
- When switching from Korloy’s older NC series to T9000, start at 80% of the recommended speed and increase by 10% increments until optimal performance is found.
- T9000 inserts are compatible with all standard ISO turning holders. No special tooling is required.
Conclusion
The Korloy T9000 series represents a meaningful upgrade from the company’s previous NC-series grades. The gradient substrate and nano-composite coating deliver measurable improvements in speed capability, tool life, and surface finish. With five grades covering ISO P05 through P45, the T9000 family addresses the full range of steel turning operations from high-speed finishing to heavy roughing. For shops already using Korloy inserts, the T9000 series is a drop-in upgrade that requires no changes to existing tooling or CNC programs — only updated speed and feed values.
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