Korloy CNMG120404-GS PC9030 Stainless Steel Semi-Finishing Insert (10pcs)
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The Original Korloy CNMG120404-GS PC9030 (ANSI Standard: CNMG 431) is a high-performance PVD-coated carbide insert specifically optimized for the semi-finishing of Stainless Steel (M-class). The GS chipbreaker is the middle-ground expert: it offers sharper cutting than roughing geometries to prevent work hardening, yet remains robust enough to handle moderate variations in depth of cut. Combined with the legendary PC9030 grade, this insert provides exceptional resistance to built-up edge (BUE) and thermal cracking in materials like 304, 316, and Duplex stainless.
Precision & Control: The GS geometry is specifically designed to provide stable chip evacuation across a broad range of medium cutting conditions, making it a highly reliable "set-and-forget" choice for CNC production.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | CNMG120404-GS |
| ANSI Code | CNMG 431 |
| Grade | PC9030 (Premium PVD for Stainless Steel) |
| Chipbreaker | GS (General Semi-finishing) |
Core Performance Benefits:
- Excellent Surface Integrity: The R0.4 nose radius reduces radial pressure, ensuring tight tolerances and minimal vibration on smaller workpieces.
- Anti-Adhesion PVD Coating: Specialized PC9030 coating chemistry prevents gummy stainless steel chips from welding to the insert edge.
- Optimized Chip Breaking: The GS breaker ensures chips are curled and broken efficiently even at fluctuating depths of cut (ap).
- Reduced Work Hardening: Sharp shearing geometry ensures the tool cuts through the material rather than rubbing it, preserving part quality.
Recommended Cutting Parameters:
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Austenitic (304/316) | 110 - 220 m/min | 0.08 - 0.25 mm/rev | 0.4 - 3.0 mm |
| Duplex Stainless (2205) | 70 - 130 m/min | 0.06 - 0.20 mm/rev | 0.4 - 2.5 mm |
Compatible Tool Holders:
For precision semi-finishing, we recommend rigid D-Type or M-Type holders:
- External Turning: PCLNR/L 2020K12 / PCLNR/L 2525M12
- Internal Boring Bars: S25S-PCLNR12 / S32T-PCLNR12
Application Tip: GS vs. HS Chipbreaker
Choosing the right geometry for your stainless project:
A balanced "all-rounder" for semi-finishing. Stronger than HS, making it better for parts with slight diameter variations.
Much sharper. Use this specifically for very light finishing passes where preventing heat and work hardening is the absolute priority.
Machinist's Advice: When using the GS breaker on CNC lathes, ensure consistent coolant delivery to the cutting edge to maximize the life of the PC9030 coating.
Packaging: 10 pieces per box.