Korloy DCMT070204-HMP NC3020 Carbide Insert for Steel Finishing (10pcs)
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The Original Korloy DCMT070204-HMP NC3020 (ANSI Standard: DCMT 21.51) is a high-performance 55° diamond turning insert optimized for General Steel (P) and Carbon Steel machining. This insert combines the precision-oriented HMP chipbreaker with the highly wear-resistant NC3020 CVD coating. It is specifically designed to provide long tool life and excellent surface finishes during high-speed finishing and semi-finishing operations on a wide range of steel workpieces.
High-Speed Steel Specialist: The NC3020 grade features a thick CVD coating that acts as a thermal barrier, allowing for increased cutting speeds (Vc) without compromising the integrity of the cutting edge.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | DCMT070204-HMP |
| ANSI Code | DCMT 21.51 |
| Grade | NC3020 (CVD Coated for Steel) |
| Nose Radius | 0.4 mm (Industry Standard Finish) |
Core Performance Benefits:
- Precision HMP Geometry: Engineered for light-to-medium depths of cut, providing tight chip curls and preventing surface damage to the workpiece.
- CVD Coating Durability: Offers superior resistance to crater wear and heat, making it ideal for continuous, long-duration cuts in high-carbon steel.
- Excellent Surface Finish: The R0.4 radius is the versatile choice for achieving low Ra values while maintaining edge strength.
- Optimized for Small CNCs: The 07 size is perfect for precision components, Swiss-type lathes, and small-diameter internal boring.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Low Carbon Steel (Mild Steel) | 180 - 350 m/min | 0.08 - 0.22 mm/rev | 0.5 - 2.5 mm |
| Alloy Steel (4140 / 4340) | 150 - 280 m/min | 0.10 - 0.20 mm/rev | 0.5 - 2.0 mm |
| Pre-hardened Steel | 80 - 160 m/min | 0.06 - 0.15 mm/rev | 0.3 - 1.5 mm |
Compatible Tool Holders:
Fits all standard 55-degree diamond holders with 07-size pockets:
- External Holders: SDJCR/L 0808 / 1010 / 1212F07 / 1616H07
- Internal Boring Bars: S08K-SDUCR07 / S10K-SDUCR07 / S12M-SDUCR07
Steel Grade Pro-Tip: NC3020 vs. NC3120
Selecting the best CVD grade for your steel turning:
Optimized for Wear Resistance. Best for continuous cuts at higher speeds where maintaining surface finish and dimensional tolerance is key.
Optimized for Versatility. Choose NC3120 if you have light interrupted cuts or unstable machining conditions. It is a "tougher" grade than NC3020.
Machinist's Insight: NC3020 is ideal for "lights-out" production where consistency in steel machining is vital. If the tip is chipping prematurely, consider reducing the speed or switching to NC3120.
Packaging: 10 pieces per box.