Korloy CNMG120404-HA NC3020 Steel Turning Insert, Sharp Edge (10pcs)
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The Original Korloy CNMG120404-HA NC3020 (ANSI Standard: CNMG 431) is a unique high-performance insert combining an ultra-sharp geometry with a heavy-duty CVD coating. While the HA chipbreaker is famous for its razor-sharp shearing action, the NC3020 grade provides the thermal stability and wear resistance needed for high-speed steel turning. This combination is the ultimate solution for low carbon steels, mild steels, and gummy alloy steels where maintaining a clean surface finish and preventing built-up edge is a challenge.
Machinist's Advantage: The HA geometry significantly reduces cutting forces and vibration, making it ideal for precision finishing on slender steel parts or machines with lower horsepower.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | CNMG120404-HA |
| ANSI Code | CNMG 431 |
| Grade | NC3020 (Premium CVD Coated for Steel) |
| Chipbreaker | HA (High-Positive Sharp Edge) |
Core Performance Benefits:
- Extreme Sharpness: The HA rake angle shears through steel smoothly, preventing the "tearing" effect often seen in soft steel finishing.
- CVD NC3020 Coating: Provides superior protection against crater wear and high temperatures, allowing for higher cutting speeds (Vc).
- Low Cutting Force: Minimizes the risk of workpiece deflection, ensuring high dimensional accuracy on small or thin-walled parts.
- Superior Finish: Specifically designed to produce a bright, burr-free surface on 1018, 1045, and A36 steels.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Low Carbon Steel (1018/A36) | 180 - 350 m/min | 0.08 - 0.25 mm/rev | 0.2 - 2.5 mm |
| Medium Carbon Steel (1045) | 150 - 300 m/min | 0.10 - 0.20 mm/rev | 0.2 - 2.0 mm |
| Soft Alloy Steels | 140 - 280 m/min | 0.08 - 0.18 mm/rev | 0.2 - 1.5 mm |
Compatible Tool Holders:
For high-precision steel turning, we recommend rigid D-Type or M-Type holders:
- External Turning: PCLNR/L 2020K12 / PCLNR/L 2525M12
- Internal Boring Bars: S25S-PCLNR12 / S32T-PCLNR12
Steel Grade Tip: NC3020 vs. NC3120
Choosing the right Korloy steel grade for your finish:
The General Specialist. First choice for continuous cutting of carbon steel. Excellent balance of wear resistance and toughness.
The Interrupted Expert. Better suited for heavy interrupted cuts or machining forged steel with unstable surfaces.
Pro Tip: When using the HA chipbreaker on steel, keep your depth of cut relatively light. The sharpness is your biggest advantage for precision, but avoid heavy roughing to prevent premature edge wear.
Packaging: 10 pieces per box.