Korloy MRMN400-M NC3020 4mm Full Radius R2.0 CVD Steel Profiling Insert (10pcs)
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The Original Korloy MRMN400-M NC3020 is a heavy-duty 4.0mm Full Radius (R2.0) Profiling Insert designed for high-efficiency Steel (P) machining. Featuring the advanced NC3020 CVD coating, this insert is built to withstand the intense heat of high-speed continuous cutting. The Full Radius (Round Nose) geometry combined with the -M (Medium) chipbreaker allows for exceptional chip control and surface finish when performing deep contouring and heavy profiling on carbon and alloy steels.
Engineered for Productivity: The NC3020 grade utilizes a thick Al2O3 CVD coating that provides a superior thermal barrier. This allows for significantly higher cutting speeds compared to PVD grades, making it the top choice for mass production where cycle time reduction is critical.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | MRMN400-M |
| Insert Shape | Full Radius (Round Nose) |
| Width / Radius | 4.0 mm / R2.0 |
| Grade | NC3020 (Premium Steel CVD) |
Core Performance Benefits:
- Large 4.0mm Rigid Body: Maximum stability for deep radial plunging and wide lateral profiling.
- CVD Wear Resistance: Exceptional resistance to cratering and flank wear in high-temperature steel cutting.
- Optimized -M Chipbreaker: Effectively manages chips across a wide variety of carbon steels, preventing tool entanglement.
- Flawless 3D Contouring: The full R2.0 radius ensures smooth transitions and high surface integrity on curved profiles.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (f) |
|---|---|---|
| Carbon Steel (1045 / S45C) | 130 - 230 m/min | 0.10 - 0.25 mm/rev |
| Alloy Steel (4140 / 42CrMo) | 100 - 180 m/min | 0.08 - 0.20 mm/rev |
| Ductile Cast Iron | 110 - 200 m/min | 0.12 - 0.28 mm/rev |
Compatible Tool Holders:
Precision 4.0mm seat fit for standard Right-Hand holder systems:
- External Holders: MGEHR 2525-4 / 3232-4
- Internal Holders: MGIVR 3125-4 / 4032-4
Machinist Tip: When to choose MRMN400-M NC3020?
The 4.0mm full radius is a powerful tool, but selecting the right grade is key to profitability:
The Steel Workhorse. Best for dry cutting or high-speed steel turning. It excels in stable setups where tool life consistency is the number one priority.
The Tough All-Rounder. Switch to PC5300 if you encounter interrupted cuts, vibration issues, or need to switch frequently between steel and stainless steel.
Pro Advice: For MRMN400-M NC3020, a higher feed rate often results in better chip breaking. If you see stringy chips at the recommended feed, check your machine's rigidity and try increasing the feed by 10% to "force" the chip into the breaker.
Packaging: 10 pieces per box.
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