Korloy DCMT11T304-HMP NC3030 Steel Turning Insert for Interrupted Cuts (10pcs)
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The Original Korloy DCMT11T304-HMP NC3030 (ANSI Standard: DCMT 32.51) is a high-toughness CVD-coated insert engineered for Steel (P) turning under unstable or interrupted conditions. While maintainng the precision-oriented HMP chipbreaker, the NC3030 grade provides a thicker, more impact-resistant coating layer. This makes it the premier choice for machining structural steels, forgings, and workpieces with surface scale or heavy interruptions where standard grades might chip.
The Stability Specialist: NC3030 is specifically designed to prevent catastrophic edge failure. It excels in "non-ideal" environments, such as older CNC machines, long-overhang setups, or workpieces with interrupted geometries like keyways and holes.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | DCMT11T304-HMP |
| ANSI Code | DCMT 32.51 |
| Grade | NC3030 (High-Toughness CVD for Steel) |
| Nose Radius | 0.4 mm (Versatile Strength & Finish) |
Core Performance Benefits:
- Shock-Resistant Coating: The NC3030's CVD layers are optimized to absorb mechanical vibration and thermal shock, extending life in roughing cycles.
- HMP Finishing Control: Even with a tough grade, the HMP geometry ensures excellent chip breaking at light-to-medium depths of cut.
- Work-Hardening Resistance: Effectively cuts through tough surface layers on carbon and alloy steels without premature dulling.
- High Versatility: A reliable "safety-first" grade that handles a wide range of steel types with predictable performance.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Structure Steel (Low Carbon) | 150 - 280 m/min | 0.10 - 0.25 mm/rev | 0.5 - 2.5 mm |
| Forged Steel / Alloy Steel | 120 - 220 m/min | 0.12 - 0.28 mm/rev | 0.8 - 3.0 mm |
| Interrupted Steel Cut | 80 - 150 m/min | 0.08 - 0.20 mm/rev | 0.5 - 2.0 mm |
Compatible Tool Holders:
Designed for all standard 55° diamond tool holders (11T3 size):
- External Turning: SDJCR/L 1616H11 / 2020K11 / 2525M11
- Internal Boring: S16Q-SDUCR11 / S20R-SDUCR11 / S25S-SDUCR11
Steel Grade Selection: NC3030 vs. NC3020
How to choose the right CVD grade for your steel job:
Choose this for Roughing or Interrupted Cuts. It is designed to survive impact. Perfect for forged parts and general workshop use where reliability is priority #1.
Choose this for High-Speed Continuous Turning. It offers better longevity during long finishing passes in stable conditions but is more prone to chipping in interruptions.
Machinist's Pro Tip: If you are running an older machine or a "sketchy" setup with a lot of vibration, the NC3030 is your insurance policy against broken inserts.
Packaging: 10 pieces per box.