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.
Technical FAQ & Buying Guide
Absolutely. Our CNC carbide inserts (including CNMG, WNMG, DNMG, and APMT series) are manufactured strictly adhering to international ISO/ANSI specifications. A CNMG 120408 from OYYU BEYOND will flawlessly fit any standard turning tool holder or indexable tool from major global brands like Sandvik Coromant, Kennametal, Iscar, Walter, or SECO, providing a highly cost-effective premium alternative without sacrificing tolerance or tool life.
We offer optimized CVD and PVD multi-layer coatings for different ISO material groups:
- For Carbon/Alloy Steel (ISO P): Choose our thick multi-layer CVD coated grades (e.g., Al2O3 + TiN). They provide exceptional crater wear resistance and thermal barriers during high-speed dry or wet roughing.
- For Stainless Steel (ISO M): Choose our nano-structured PVD coated grades with sharp, positive chipbreakers (like -TM or -MA). This combination prevents work hardening and effectively controls sticky chips.
The optimal cutting parameters vary depending on the workpiece hardness and operation type:
- For General Steel Turnings: Recommended cutting speed ($V_c$) ranges from 150 to 280 m/min, with a feed rate ($f$) of 0.15 to 0.45 mm/rev.
- For Stainless Steel Finishing: Recommended cutting speed ($V_c$) is 120 to 200 m/min, with a feed rate ($f$) of 0.10 to 0.25 mm/rev.Always adjust parameters based on early wear patterns: increase $V_c$ if built-up edge occurs, or reduce $V_c$ if severe flank wear is observed.
Yes, we support machine shops, distributors, and global buyers with tiered wholesale pricing and competitive volume discounts. We also provide OEM custom manufacturing solutions for tool holders and carbide inserts based on your technical drawings. Contact our team to request a quick B2B quotation.
We provide secure worldwide express shipping (via DHL, FedEx, and UPS) with specialized, vibration-proof industrial packaging to ensure tools arrive in perfect condition. In-stock items are dispatched within 24-48 hours, while custom or bulk orders typically have a stable lead time of 15-25 days.
All our cutting tools and tool holders are manufactured strictly in accordance with ISO 9001 and international industrial standards. Every batch undergoes 100% rigorous quality control testing using high-precision optical measuring equipment to ensure reliable tool life and stable performance in continuous mass production.