Korloy VBMT160404-HMP PC9030 (ANSI VBMT 331-HMP) PVD Carbide Insert for Stainless Steel (10pcs)
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The Original Korloy VBMT160404-HMP PC9030 (ANSI Cross Reference: VBMT 331-HMP) is a premium 35° Rhombic Positive Insert designed specifically for the challenges of Stainless Steel Machining. Utilizing a reinforced 1604 substrate and the advanced PC9030 PVD Grade, this insert excels in preventing work-hardening and built-up edge (BUE). It is the ideal choice for semi-finishing and medium cutting on large stainless components where thermal stability and edge toughness are paramount.
Heavy-Duty Stainless Specialist: The 1604 size (4.76mm thickness) provides the necessary rigidity to handle the high cutting pressures of stainless steel. Combined with PC9030’s anti-adhesion properties, it ensures high-precision turning even in gummy materials like 304 and 316.
Technical Specifications (Metric & ANSI):
| ISO Designation | VBMT 160404-HMP |
| ANSI Designation | VBMT 331-HMP |
| 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 (TiAlN PVD Coated) |
| Primary Material | Stainless Steel (M), Exotic Alloys (S) |
Core Performance Benefits:
- Superior Wear Resistance: The high-aluminum TiAlN PVD coating provides a hard, heat-resistant barrier that protects the substrate during long cuts.
- Reduced Tool Pressure: The HMP chipbreaker is designed to minimize radial forces, which is critical for preventing vibration on slender stainless shafts.
- Excellent Edge Sharpness: Unlike CVD grades, the PVD PC9030 maintains a sharper edge, essential for slicing through stainless steel rather than "pushing" it.
- Versatile 35° Geometry: Perfect for profiling, undercutting, and complex contours on stainless housings and valves.
Recommended Cutting Parameters:
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| 300 Series Stainless (304/316) | 90 - 160 m/min | 0.08 - 0.20 mm/rev | 0.3 - 2.5 mm |
| 400 Series Stainless (420/440) | 110 - 190 m/min | 0.10 - 0.22 mm/rev | 0.5 - 3.0 mm |
Precision Tooling Compatibility:
- External Profile Tool Holders: SVJBR 2020K16 / SVJBR 2525M16
- Internal Boring Bars: S32T-SVUBC16 / S40U-SVQBC16
Machinist Tip: Mastering 316 Stainless
How to optimize the VBMT 160404 for exotic metals:
Stainless steel has poor thermal conductivity. The heat stays at the tool tip. Always use plenty of high-pressure coolant to flush chips and keep the PC9030 coating within its ideal temperature range.
Stainless steel work-hardens instantly. Ensure your Depth of Cut (ap) is greater than the corner radius (0.4mm) whenever possible to get the tool tip beneath the work-hardened layer from the previous pass.
Packaging: 10 pieces per box.
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