Korloy VNMG160404-HM PC9030 (ANSI VNMG 331-HM) PVD Carbide Insert for Stainless Steel (10pcs)
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The Original Korloy VNMG160404-HM PC9030 (ANSI Cross Reference: VNMG 331-HM) is a high-performance 35° Rhombic Negative Insert specifically engineered for Stainless Steel Turning. Featuring the specialized PC9030 PVD Grade, this insert is designed to combat the unique challenges of work-hardening and built-up edge (BUE) common in austenitic stainless steels (304, 316). With its 4 cutting edges and precise 0.4mm radius, it provides an exceptional combination of economy, surface finish, and edge sharpness.
Superior Adhesion Resistance: Stainless steel is notorious for sticking to the tool edge. The ultra-smooth PVD TiAlN coating on the PC9030 grade minimizes friction, allowing chips to evacuate quickly and preventing the "welding" effect that ruins surface finishes.
Technical Specifications (Metric & ANSI):
| ISO Designation | VNMG 160404-HM |
| ANSI Designation | VNMG 331-HM |
| Inscribed Circle (IC) | 9.525 mm / (3/8") |
| Thickness (S) | 4.76 mm / (3/16") |
| Corner Radius (r) | 0.4 mm / (1/64") |
| Grade | PC9030 (Premium PVD Coated) |
| Target Materials | Stainless Steel (M), HRSA (S) |
Core Performance Benefits:
- Advanced PVD TiAlN Coating: Offers high oxidation resistance and hardness at elevated temperatures, protecting the sharp cutting edge during long cycles in stainless steel.
- Double-Sided 4-Edge Design: Maximizes cost-efficiency by providing four usable edges per insert, outperforming single-sided positive inserts in high-volume production.
- HM "Harmony" Chipbreaker: Specially tuned for medium-duty cutting, this breaker ensures stable chip control even in "gummy" materials, preventing scratches on the workpiece.
- High-Precision R0.4 Edge: Generates lower radial cutting forces, making it ideal for precision profiling, fine finishes, and machining thin-walled or unstable parts.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Austenitic (304/316) | 100 - 180 m/min | 0.08 - 0.20 mm/rev | 0.5 - 2.5 mm |
| Martensitic (420/440C) | 110 - 200 m/min | 0.08 - 0.18 mm/rev | 0.5 - 2.5 mm |
Compatible Tooling:
- External Profile Tooling: MVJNR / MVVNN / DVLNR Series (Size 16)
- Internal Boring Bars: S32U-MVQNR16 / S40V-MVUNR16
Pro Tip: Precision Stainless Profiling
When profiling stainless with an R0.4 tip, use a feed rate at least 25% higher than the honing/radius of the edge to "bite" into the material. This helps prevent work-hardening and chatter.
Always use high-pressure, flood coolant when machining stainless steel with PC9030. This ensures the chips are cooled instantly, preventing them from fusing to the HM chipbreaker.
Packaging: 10 pieces per box.
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