SUMITOMO VNMG160408N-GU AC6030M Stainless Steel Turning Insert (VNMG 160408 / VNMG 332 Equivalent)
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SUMITOMO VNMG160408N-GU AC6030M Absotech Platinum CVD Carbide Stainless Steel Turning Insert
1. Product Overview
"Which indexable carbide turning insert provides the longest tool life, best anti-chipping security, and stable chip control when medium-roughing gummy austenitic stainless steels or hard duplex alloys?"
The SUMITOMO VNMG160408N-GU AC6030M is a premium, 35° rhombic negative double-sided carbide turning insert meticulously engineered to overcome the severe work-hardening and built-up edge (BUE) tendencies typical of stainless steel machining. Optimized for the ISO M10–M35 material spectrum (including AISI 304, 316, duplex 2205, and precipitation-hardening alloys), this insert features Sumitomo's breakthrough AC6030M Absotech Platinum CVD Technology. By deploying an ultra-smooth, highly oriented crystalline $\alpha$-$\text{Al}_2\text{O}_3$ coating layer combined with a specialized TiCN matrix, it provides a drastically lower coefficient of friction that prevents chip welding and micro-chipping at the cutting edge. Paired with the heavy-duty -GU Type Chipbreaker, it integrates a fortified cutting edge land that reliably manages hard scale inclusions while ensuring stable chip contraction and lower cutting forces across medium-to-rough profiling.
2. Product Key Features
- Absotech Platinum CVD Technology: Next-generation coating structure offers more than double the chipping resistance of conventional grades, aggressively preventing boundary notch wear along the depth-of-cut line.
- Super-Smooth Coating Layer: The ultra-flat surface finish minimizes friction, dramatically reducing adhesion and built-up edge when cutting gummy materials like AISI 304/316.
- Fortified -GU Chipbreaker Geometry: Specially designed with a robust rake face land that strikes a perfect balance between cutting edge strength and reduced power consumption.
- Double-Sided 4-Corner Efficiency: Negative structural configuration provides 4 highly accurate cutting edges, lowering tooling costs per component while maintaining high precision.
3. Technical Specifications & Dimension Matrix
🔍 ISO / ANSI Industrial Nomenclature Decoding Matrix
| Dimension Parameter | Metric Specification (ISO) | Imperial Equivalent Benchmark (ANSI) |
|---|---|---|
| Product Designation Model | VNMG160408N-GU | VNMG 332-GU (VNMG332) |
| Inscribed Circle (IC) Diameter | 9.525 mm | 0.375 in (3/8") |
| Insert Thickness (s) | 4.76 mm | 0.1875 in (3/16") |
| Nose Corner Radius ($r_{\epsilon}$) | 0.8 mm | 0.0315 in (2/64") |
📊 Recommended Technical Cutting Parameters
| Workpiece Material Category | Cutting Speed ($v_c$) | Feed Rate per Revolution ($f$) / Depth ($a_p$) |
|---|---|---|
| Austenitic Stainless Steel (AISI 304 / 316 / 1.4301) | 140 - 270 m/min (460 - 885 SFM) | 0.15 - 0.40 mm/rev (0.006 - 0.016 ipr) ap: 0.8 - 4.0 mm (0.031 - 0.157 in) |
| Duplex & Super Duplex Alloys (2205 / 2507 / F51) | 90 - 180 m/min (295 - 590 SFM) | 0.12 - 0.35 mm/rev (0.005 - 0.014 ipr) ap: 0.6 - 3.2 mm (0.024 - 0.126 in) |
This VNMG 1604 / VNMG 33 double-sided profiling insert requires ultra-rigid rigid lever or top-clamp tool blocks to withstand severe stainless work-hardening forces.
Browse Matching MVJNR / MVUNR / MVQNR Lathe Toolholders →4. Product Application Scenarios
The AC6030M high-wear resistance matrix excels across demanding industrial stainless steel component manufacturing:
5. Toolholder & Equipment Compatibility
Compliant with standard global indexable interface geometry, this insert matches seamlessly with international tooling blocks:
- Turning Shank Assemblies: Fits all standard negative 35° profile external shanks (MVJNR/L, MVUNR/L, MVQNR/L) and rigid internal boring bars designed for VNMG1604 or VNMG332 insert dimensions.
- CNC Production Platforms: Built for high-power CNC lathes and automated multi-axis turning centers (Mazak Integrex, Doosan Puma, Haas ST, DMG Mori, Okuma LB) running automated parts programs.
6. Industrial Grade Comparison Matrix
| Brand | Equivalent Grade Reference | Application Range | Coating Technology |
|---|---|---|---|
| SUMITOMO | AC6030M (Target) | ISO M10 - M35 / General Purpose to Heavy Stainless Steel Turning | Absotech Platinum Crystalline Ultra-Smooth CVD Coating |
| Sandvik Coromant | GC2220 / GC2025 | ISO M15 - M30 / Stainless Steel Medium Profiling Matrix | Inveio® Highly Oriented Alumina Crystal Coating |
| Kennametal | KCM25B / KCM35 | ISO M20 - M35 / Tough Austenitic & Duplex Stainless Turning | Advanced multi-layer CVD coating with specialized surface seal |
| Iscar | IC6025 / IC6015 | ISO M15 - M30 General Stainless Steel Machining Matrix | SUMO TEC high-smoothness treatment reducing adhesion friction |
7. Why Choose Us & Verified Global Performance Evaluations
Real field reports from precision machine shops utilizing Sumitomo's Absotech Platinum series for advanced alloy turning:
"We turn large AISI 316 pump shafts on our Haas ST-30. Standard tools suffered massive depth-of-cut line notch wear due to work hardening. Switching to the Sumitomo VNMG 332-GU in AC6030M boosted our parts per corner by 130%. The Absotech Platinum coating delivers exactly what it promises."
"Absolut überragende Ergebnisse bei Duplex 2205. Der -GU Spanbrecher bricht die elastischen Edelstahlspäne hervorragend. Keine Spur von Kaltverschweißungen (BUE) oder Mikroausbrüchen an der Schneidkante selbst bei Schnittgeschwindigkeiten über 160 m/min."
"Ottimo inserto per la sgrossatura e finitura media di raccorderia in acciaio inox 304. Resistenza termica eccellente e usura del fianco molto regolare."
"SUS304のフランジ加工（軽断続切削）で検証。他社製CVDチップと比較して境界摩耗が劇的に減少しました。刃先強度の高い-GUブレーカとの相乗効果で、無人運転時の突発欠損トラブルが皆無になり、生産効率が劇的に改善されました。"
8. Technical Machining FAQ
Q: Why is the AC6030M grade uniquely optimized for stainless steel instead of general steel or cast iron?
A: Stainless steel has poor thermal conductivity, which causes intense heat to concentrate directly at the insert tip, promoting chemical adhesion (built-up edge). The AC6030M grade incorporates Sumitomo's specialized Absotech Platinum CVD coating, featuring an ultra-smooth, highly oriented Alumina layer that reflects heat back into the chip and drastically lowers friction coefficient to eliminate adhesive welding.
Q: What is the ideal way to resolve stringy chip bird-nesting when turning long austenitic alloys?
A: Ensure your depth of cut ($a_p$) stays above 0.8mm to engage the open chip pocket of the -GU geometry. If stringy chips persist, incrementally increase your feed rate ($f$) to drive the chip harder against the chipbreaker land, forcing crisp structural fracture.
Q: Can this insert handle light-to-medium interrupted profiling cuts on stainless steel castings?
A: Yes. The underlying carbide substrate exhibits excellent fracture toughness, and when combined with the reinforced edge structure of the -GU land, it dampens impact shocks effectively to avoid sudden edge failure.
💡 Technical Grade Comparison & Troubleshooting Guide
Workpiece Material Matrix (ISO Classifications): Primary application parameters focus within the ISO M10 to M35 envelope. Meticulously optimized for austenitic stainless steels (AISI 304, 304L, 316, 316L, 1.4404), ferritic/martensitic families, and complex duplex/super duplex alloys (Alloy 2205, 2507) that cause rapid thermal work-hardening.
Machining Troubleshooting Guide: If rapid boundary notch wear occurs along the depth-of-cut line, utilize a variable depth-of-cut programming structure or reduce the feed rate ($f$) slightly. If chip welding or built-up edge (BUE) degrades the finish, increase the cutting speed ($v_c$) to pass the adhesion temperature zone, and ensure high-pressure flood coolant delivery.
Authorized Reference Documentation & Endorsements: Dimensional configurations, clearance profiles, and alphanumeric classifications are fully aligned with standard global ISO/ANSI geometric frameworks. Operational baselines and material boundary envelopes are cross-referenced directly with empirical field testing data published by Sumitomo Electric Hardmetal Corporation.
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Technical FAQ & Buying Guide
When choosing CNC cutting tools, check the full model code, dimensions, grade and selected variant before ordering. Do not rely on the product image alone.
For carbide inserts, tool holders, drills and end mills, compare the mounting dimensions, connection type and manufacturer's specifications with your holder or machine. If you are unsure, share your existing part number and machining application with us before ordering.
Check the product listing for the selling unit, pack quantity and included components. If it is unclear whether the price is per piece or per pack, or whether a tool body and inserts are sold separately, contact us before purchasing.
Select cutting speed, feed rate and depth of cut using the relevant manufacturer's recommendations for your tool model, workpiece material, machine conditions and coolant method. The same settings are not suitable for every product or application.
Our automatic quantity discount is 6% off for 2–9 items and 12% off for 10 or more items, based on the total product quantity in the cart. Other offers may not combine with this discount; check the applicable offer conditions.
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