Korloy TCMT090204-HMP NC3020 Steel Turning Insert (10pcs)
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The Original Korloy TCMT090204-HMP NC3020 is a highly versatile Triangular Indexable Turning Insert designed for the efficient machining of Carbon Steel, Alloy Steel, and Mild Steel. Utilizing the advanced NC3020 CVD Grade, this insert provides a perfect balance of high hardness and shock resistance. The HMP (Medium-Finishing) Chipbreaker is specifically engineered to handle varying depths of cut, providing excellent chip curling and breakage even at lower feed rates.
Standard for Steel: NC3020 is Korloy's most reliable grade for general steel turning (P20-P35 range). It excels in continuous to light interrupted cuts, making it the "workhorse" for small boring and external turning of everyday steel components.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Designation | TCMT090204-HMP |
| Corner Radius (r) | 0.4 mm |
| Grade | NC3020 (Premium CVD Coating) |
| Application | General Steel, Carbon Steel, Die Steel |
Core Performance Benefits:
- Enhanced Wear Resistance: The multi-layer CVD coating provides a tough thermal barrier, extending tool life in high-temperature cutting zones.
- Superior HMP Geometry: Optimized for medium-to-finishing, the HMP chipbreaker reduces cutting pressure and prevents "chip nesting" on the toolholder.
- Stable Edge Toughness: Specialized substrate resists edge chipping, ensuring consistent surface finishes over long production runs.
- Wide Application Range: Ideal for everything from internal boring of small tubes to general external turning on manual or CNC lathes.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Low Carbon Steel (1018) | 180 - 320 m/min | 0.08 - 0.25 mm/rev | 0.5 - 2.5 mm |
| Alloy Steel (4140/4340) | 150 - 280 m/min | 0.08 - 0.22 mm/rev | 0.4 - 2.0 mm |
| Tool Steel | 100 - 200 m/min | 0.06 - 0.18 mm/rev | 0.3 - 1.5 mm |
Compatible Tooling Systems:
Precision matched for 09-sized triangular holders:
- Internal Boring Bars: S08K-STUCR09 / S10K-STUCR09 / S12M-STUCR09
- External Toolholders: STGCR 1212H09 / STGCR 1616H09
Tech Tip: Choosing Your Steel Grade
Korloy steel grades comparison for TCMT09:
The Universal Choice. Best for a wide range of steels under stable conditions. Offers the best price-to-performance ratio for general job shop work.
For Interrupted Cuts. If you are machining hex bars or parts with holes/keyways, NC3120 provides higher shock resistance to prevent edge breakage.
Pro Advice: For the best surface finish with the HMP chipbreaker, ensure your cutting speed (Vc) is within the recommended range. Running too slow in steel can lead to built-up edge and a duller finish.
Packaging: 10 pieces per box.
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