SUMITOMO WNMG080404N-EF AC6030M (WNMG 431-EF) Stainless Steel Finishing Carbide Turning Insert
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SUMITOMO WNMG080404N-EF AC6030M (WNMG 431-EF) Absotech Platinum CVD Carbide Stainless Steel Finishing Turning Insert
1. Product Overview
"Which indexable carbide insert grade and high-precision finishing chipbreaker geometry deliver the absolute best surface roughness, adhesion resistance, and birds-nesting control during the high-speed fine turning of sticky austenitic and duplex stainless steels?"
The SUMITOMO WNMG080404N-EF AC6030M (internationally designated in imperial benchmarks as WNMG 431-EF) is a premium, industrial-grade, double-sided negative 80° trigon indexable turning insert engineered explicitly for high-precision finishing, intricate profiling, and light continuous machining of stainless steel alloys (ISO M10 - M25 classification). Utilizing Sumitomo's pioneering Absotech Platinum CVD coating technology, the AC6030M grade achieves an ultra-smooth, ultra-dense TiCN/Al2O3 crystal orientation that provides unprecedented resistance to built-up edge (BUE), micro-chipping, and thermal cracking under high cutting zone temperatures. Paired with the highly engineered EF Type Finishing Chipbreaker geometry, this insert drastically lowers cutting forces, controls stringy chip nesting under minimal depths of cut, and ensures exceptional surface finish quality (Ra value control) across high-volume automated production lines.
2. Product Key Features
- Absotech Platinum CVD Coating: Integrates a smooth outer coating layer with highly controlled residual stress. This provides excellent adhesion resistance and outstanding crater wear control when machining sticky stainless materials.
- Ultra-Sharp EF-Type Finishing Geometry: Engineered with a highly positive, razor-sharp rake land profile and narrow chip deflector walls. The EF design smoothly cuts through thin depths of cut, preventing work-hardening and deformation while breaking stringy chips efficiently.
- High-Toughness Fine-Grain Substrate: Developed with an advanced grain-controlled carbide matrix that withstands elevated thermal shocks, preventing sudden micro-chipping during high-speed cross-feed transitions and long continuous finishing cuts.
- 6 Economical Cutting Edges: The negative 80-degree structural trigon layout yields 6 distinct cutting corners per insert, delivering elite processing economy and maximizing shop floor cost savings.
3. Technical Specifications & Dimension Matrix
🔍 ISO / ANSI Nomenclature Decoding Matrix
| Dimension Parameter | Metric Specification (ISO) | Imperial Specification (ANSI) |
|---|---|---|
| Inscribed Circle (IC) | 9.525 mm | 0.375 in (3/8") |
| Thickness (S) | 4.76 mm | 0.187 in (3/16") |
| Corner Nose Radius (re) | 0.4 mm | 0.0156 in (1/64") |
| Fixing Hole Diameter (d1) | 3.81 mm | 0.150 in |
📊 Recommended Technical Cutting Parameters
| Workpiece Material Category | Cutting Speed (vc) | Feed Rate (f) / Depth of Cut (ap) |
|---|---|---|
| Austenitic Stainless Steel (SUS304 / SUS316) | 160 - 260 m/min (525 - 850 SFM) | 0.05 - 0.15 mm/rev (0.002 - 0.006 ipr) ap: 0.2 - 1.2 mm (0.008 - 0.047 in) |
| Duplex Stainless Steel (SUS329J4L / 2205) | 100 - 180 m/min (330 - 590 SFM) | 0.05 - 0.12 mm/rev (0.002 - 0.005 ipr) ap: 0.2 - 1.0 mm (0.008 - 0.039 in) |
This WNMG0804 / WNMG431 indexable matrix requires standard external or internal negative turning toolholders with a 95° approach angle.
Browse Matching MWLNR/L & WWLNR/L Toolholders →4. Product Application Scenarios
The AC6030M fine-turning grade offers exceptional dimensional stability across critical tight-tolerance parts:
5. Toolholder & Equipment Compatibility
Strictly compliant with indexable geometric standard pocket seating, this insert integrates natively into global standard hardware:
- External Shank Holders: MWLNR2020K08, MWLNR2525M08, WWLNR2525M08 (Metric) / MWLNR16-4B, WWLNR16-4B (Imperial).
- Boring Bars (Internal): A32S-MWLNR08, A40T-MWLNR08 (Minimum bore clearance diameter >= 40mm).
- Lathe Integration: Optimized for high-rigidity CNC turning centers (Mazak, DMG Mori, Okuma, Haas) utilizing high-volume flood coolant delivery to maximize chip clearing and heat dissipation.
6. Industrial Grade Comparison Matrix
| Brand | Equivalent Grade Reference | Application Range | Coating Properties |
|---|---|---|---|
| SUMITOMO | AC6030M (Target) | ISO M10 - M25 / Finishing & Fine Profiling Stainless Steel | Absotech Platinum CVD Al2O3 - TiCN Crystal Matrix |
| Sandvik Coromant | GC2220 / GC2015 | ISO M15 - M25 / Stainless Precision Finishing | Inveio CVD multi-layer alumina coating |
| Kennametal | KCM15B / KC9215 | ISO M10 - M20 / Fine Stainless Machining | Advanced multi-layered CVD system |
| Iscar | IC6015 | ISO M10 - M20 / High-Speed Fine Stainless Turning | CVD coated high-hardness wear-resistant grade |
7. Why Choose Us & Verified Global Performance Evaluations
Real-world machine shop metrics proving absolute dimensional accuracy and chip breaking efficiency under minimal loads:
"We turn thin-walled 304 stainless tubes. Standard finishing inserts always caused long stringy nest ribbons that wrapped around the chuck and ruined the finish. The EF chipbreaker curls and snaps the chips beautifully even at a tiny 0.3mm depth of cut. Surface finish is like glass."
"Brillante Maßhaltigkeit bei kleinen Toleranzen. Die Absotech Platinum-Beschichtung verhindert Aufbauschneiden komplett. Wir fahren damit 220 m/min bei SUS316 und die Standzeit ist im Vergleich zu anderen Marken um 40% gestiegen."
"Geometria eccellente per finitura. Riduce drasticamente lo sforzo di taglio radiale, evitando vibrazioni sui pezzi lunghi. Spedizione rapida e imballaggio originale perfetto."
"ステンレスの仕上げ加工加工で長年愛用しています。EFブレーカの切れ味が鋭いため、構成刃先が発生せず、寸法変化が極めて少ないです。Absotechコーティングの耐摩耗性は圧倒的ですね。"
8. Technical Machining FAQ
Q: What is the main structural difference between the EF chipbreaker and the EG chipbreaker?
A: The EF chipbreaker features a narrower groove structure and a sharper, more positive cutting edge land optimized specifically for light finishing operations (ap < 1.5mm). The EG chipbreaker is wider, designed to handle medium-duty profiling and variable cutting depths without chipping.
Q: Can I use this insert for heavy roughing passes on stainless steel?
A: No. The WNMG080404N-EF is custom-tuned for fine-turning. Attempting heavy depths of cut or massive feed rates will overwhelm the delicate EF groove geometry, causing premature crater wear or structural tip fracture. For roughing, select Sumitomo's EM or EM Type geometries.
Q: How does the AC6030M grade combat work hardening during finishing?
A: Work hardening occurs when blunt tools strain the workpiece surface. The EF geometry acts as a razor to cleanly shear the layer away rather than rubbing it, while the Absotech Platinum CVD layer acts as a premium thermal shield to keep heat out of the unmachined substrate material.
💡 Technical Grade Comparison & Troubleshooting Guide
Workpiece Material Matrix (ISO Classifications): Primary application domain covers ISO M10 to M25 parameters. Explicitly optimized for stable, continuous, or high-speed precision finishing of austenitic stainless steel (304, 316, 316L), ferritic/martensitic stainless steel (410, 430), and high-durability duplex alloys.
Machining Troubleshooting Guide: If stringy chip ribbons re-emerge, ensure you are not running below the critical feed rate (f < 0.05 mm/rev) necessary to engage the chipbreaker wall. If micro-chipping occurs along the cutting edge during profiling, reduce cutting speeds slightly or check the structural rigidity of the lathe spindle setup.
Authorized Reference Documentation & Endorsements: Dimensional configurations, pocket seating tolerances, and naming structures fully comply with the international ISO 1832:2017 industrial standards blueprint. Mechanical strength thresholds, thermal crack criteria, and wear tolerances are cross-referenced from verified test catalogs published by Sumitomo Electric Hardmetal Corp.
Technical FAQ & Buying Guide
Absolutely. Our CNC carbide inserts (including CNMG, WNMG, DNMG, and APMT series) are manufactured strictly adhering to international ISO/ANSI specifications. A CNMG 120408 from OYYU BEYOND will flawlessly fit any standard turning tool holder or indexable tool from major global brands like Sandvik Coromant, Kennametal, Iscar, Walter, or SECO, providing a highly cost-effective premium alternative without sacrificing tolerance or tool life.
We offer optimized CVD and PVD multi-layer coatings for different ISO material groups:
- For Carbon/Alloy Steel (ISO P): Choose our thick multi-layer CVD coated grades (e.g., Al2O3 + TiN). They provide exceptional crater wear resistance and thermal barriers during high-speed dry or wet roughing.
- For Stainless Steel (ISO M): Choose our nano-structured PVD coated grades with sharp, positive chipbreakers (like -TM or -MA). This combination prevents work hardening and effectively controls sticky chips.
The optimal cutting parameters vary depending on the workpiece hardness and operation type:
- For General Steel Turnings: Recommended cutting speed ($V_c$) ranges from 150 to 280 m/min, with a feed rate ($f$) of 0.15 to 0.45 mm/rev.
- For Stainless Steel Finishing: Recommended cutting speed ($V_c$) is 120 to 200 m/min, with a feed rate ($f$) of 0.10 to 0.25 mm/rev.Always adjust parameters based on early wear patterns: increase $V_c$ if built-up edge occurs, or reduce $V_c$ if severe flank wear is observed.
Yes, we support machine shops, distributors, and global buyers with tiered wholesale pricing and competitive volume discounts. We also provide OEM custom manufacturing solutions for tool holders and carbide inserts based on your technical drawings. Contact our team to request a quick B2B quotation.
We provide secure worldwide express shipping (via DHL, FedEx, and UPS) with specialized, vibration-proof industrial packaging to ensure tools arrive in perfect condition. In-stock items are dispatched within 24-48 hours, while custom or bulk orders typically have a stable lead time of 15-25 days.
All our cutting tools and tool holders are manufactured strictly in accordance with ISO 9001 and international industrial standards. Every batch undergoes 100% rigorous quality control testing using high-precision optical measuring equipment to ensure reliable tool life and stable performance in continuous mass production.