Korloy MRMN200-M NC3120 2mm Full Radius R1.0 CVD Steel & Cast Iron Insert (10pcs)
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The Original Korloy MRMN200-M NC3120 is a versatile 2.0mm Full Radius (R1.0) Profiling Insert specifically designed for high-stability Steel (P) and Cast Iron (K) machining. Featuring the advanced NC3120 CVD coating, this insert bridges the gap between high-speed wear resistance and impact toughness. The Full Radius (Round Nose) geometry and -M (Medium) chipbreaker provide excellent surface finishes and reliable chip management during intricate 3D contouring on CNC lathes.
The Versatile Performer: NC3120 is engineered with a specialized CVD layer that excels in both general steel turning and abrasive cast iron applications. It offers better toughness than NC3020, making it more resistant to micro-chipping in varied production environments.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | MRMN200-M |
| Insert Shape | Full Radius (Round Nose) |
| Width / Radius | 2.0 mm / R1.0 |
| Grade | NC3120 (Steel & Cast Iron CVD) |
Core Performance Benefits:
- Multi-Material Application: Optimized for Carbon Steel, Alloy Steel, and Grey/Ductile Cast Iron.
- R1.0 Precision Profile: Ideal for half-round grooves and smooth, seamless transitions in 3D profiling.
- High-Toughness CVD: The NC3120 grade provides excellent resistance to edge buildup and thermal cracking.
- Consistent Surface Finish: The -M chipbreaker maintains stable cutting forces, resulting in high-quality mirror-like finishes on shafts.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (f) |
|---|---|---|
| Mild Steel (1018/S20C) | 140 - 240 m/min | 0.05 - 0.15 mm/rev |
| Alloy Steel (4140/42CrMo) | 110 - 200 m/min | 0.04 - 0.12 mm/rev |
| Ductile Cast Iron (FCD) | 120 - 220 m/min | 0.06 - 0.18 mm/rev |
Compatible Tool Holders:
Precision 2.0mm seat fit for standard holder systems:
- External Holders: MGEHR 1212-2 / 1616-2 / 2020-2
- Internal Holders: MGIVR 2016-2 / 2520-2
Machinist Tip: Why choose NC3120 over NC3020?
Understanding the versatility of the NC3120 grade:
The "Balanced" Choice. If you switch between machining steel and cast iron frequently, or if your steel setup has minor vibrations, NC3120's added toughness prevents the edge from chipping prematurely.
The "High Speed" Choice. Only recommended for continuous, ultra-stable steel turning where maximum wear resistance is the only requirement. Less effective on cast iron than NC3120.
Pro Advice: For MRMN200-M NC3120, the 2.0mm width is thin. Always ensure your tool holder is clean and the clamping screw is torqued correctly to prevent micro-vibrations that could lead to "chatter" marks on your radius.
Packaging: 10 pieces per box.
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