SUMITOMO WNMG080404N-GU AC630M (WNMG 431-GU) Stainless Steel Turning Insert
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SUMITOMO WNMG080404N-GU AC630M (WNMG 431-GU) Absotech CVD Carbide Stainless Steel Turning Insert
1. Product Overview
"Which indexable carbide insert grade and chipbreaker configuration are best suited to prevent work hardening, eliminate built-up edge (BUE), and ensure structural edge stability during medium turning of austenitic and duplex stainless steels?"
The SUMITOMO WNMG080404N-GU AC630M (internationally recognized in imperial nomenclature as WNMG 431-GU) is an industrial-grade, double-sided negative 80° trigon indexable turning insert engineered specifically for medium roughing to general turning of stainless steels (ISO M classification). Engineered with Sumitomo's pioneering Absotech Bronze CVD multi-layer coating technology, the AC630M grade provides extreme resistance to adhesion, thermal cracking, and localized boundary wear. Paired with the highly engineered, low-cutting-force GU Type Chipbreaker geometry, this insert efficiently slices through gummy materials, mitigates severe work hardening, and yields long-lasting, predictable performance across variable CNC production paths.
2. Product Key Features
- Absotech Bronze Coating Technology: Utilizes an ultra-smooth, highly dense Al2O3-TiCN CVD crystal orientation coating layer. This specialized configuration delivers a superior thermal barrier and exceptional surface smoothness, drastically reducing built-up edge (BUE) adhesion on sticky stainless alloys.
- Optimized GU-Type Rake Geometry: Engineered with a sharp, positive cutting edge and a specialized variable deflector wall. It effectively minimizes cutting resistance by up to 15%, lowering thermal buildup at the tool-tip while providing outstanding chip control across mixed depths of cut.
- High-Toughness Micro-Grain Carbide Substrate: The AC630M matrix features a highly specialized structural gradient substrate designed to absorb heavy mechanical impacts and counter thermal fatigue caused by intermittent coolant applications.
- 6 Highly Cost-Effective Cutting Corners: The negative structural profile leverages a double-sided arrangement to provide 6 distinct indexable cutting corners per insert, delivering elite structural economy without sacrificing pocket seat stability.
3. Technical Specifications & Dimension Matrix
🔍 ISO / ANSI Nomenclature Decoding Matrix
Trigon Shape (80°)
0° Relief Angle
M-Class Tolerance
With Hole & Slots
Edge Length (9.525mm)
Thickness (4.76mm)
Nose Radius (0.4mm)
Medium Breaker
| 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) |
|---|---|---|
| Austenitic Stainless (304, 316 CNC Lathe Processing) | 140 - 240 m/min (460 - 790 SFM) | 0.12 - 0.35 mm/rev (0.005 - 0.014 ipr) |
| Duplex Stainless Steel (2205, Super Duplex Turning) | 90 - 160 m/min (295 - 525 SFM) | 0.10 - 0.30 mm/rev (0.004 - 0.012 ipr) |
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 AC630M specialized stainless grade provides premium security across high-spec processing operations:
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: Engineered for high-rigidity CNC turning centers (Mazak, DMG Mori, Okuma, Haas) utilizing high-pressure flood coolant delivery systems to optimize chip clearing.
6. Industrial Grade Comparison Matrix
| Brand | Equivalent Grade Reference | Application Range | Coating Properties |
|---|---|---|---|
| SUMITOMO | AC630M (Target) | ISO M20 - M30 / Heavy Duty General Stainless Machining | Absotech Bronze Smooth CVD Multi-Layer |
| Sandvik Coromant | GC2220 | ISO M20 - M25 / Medium Stainless Turning | Inveio CVD Coating Layer |
| Kennametal | KCM25B | ISO M20 - M30 / General Stainless Alloy Workpieces | High-Density CVD Al2O3-TiCN Matrix |
| Walter | WMP20S | ISO M20 - M30 / Universal Medium Cut | Tiger-tec Silver CVD System |
7. Why Choose Us & Verified Global Performance Evaluations
Real-world machine shop metrics proving structural edge stability and wear control under high speed:
"We rough 316L stock all day. Built-up edge was killing our dimensional tolerances until we put these Sumitomo AC630M inserts in the machine. The GU breaker keeps chips tightly curled and tool life predictable."
"Hervorragende Standzeit bei Duplex-Stahl 1.4462. Die Absotech Bronze Beschichtung schützt die Schneidkante perfekt vor Kammrissen. Absolut prozesssicher."
"Ottimo controllo del truciolo su acciaio inossidabile. Il tagliente resiste alla scheggiatura anche su tagli leggermente interrotti."
"SUS304の旋盤加工で使用。アブソテックブロンズコーティングの平滑性が素晴らしい。溶着が原因の境界摩耗やチッピングが大幅に減少し、夜間の無人運転でも寸法精度が安定して維持できています。"
8. Technical Machining FAQ
Q: Why should I select the AC630M grade over the AC610M for stainless steel applications?
A: The AC630M grade is engineered as a high-reliability, all-around first-choice solution for standard to rough stainless cutting conditions (ISO M20-M30). It incorporates a significantly tougher carbide core matrix than the AC610M, making it much more robust against thermal cracking, variable mechanical shock, and scale crusts during mid-range general processing sequences.
Q: How does the GU chipbreaker address the work-hardening tendencies of stainless steel?
A: The GU chipbreaker features a uniquely optimized positive rake geometry that creates a highly effective shearing action. By cleanly cutting rather than pushing the gummy material, it reduces the depth of the work-hardened layer on the workpiece surface, protecting subsequent cutting edges from accelerated notch wear.
Q: What is the recommended coolant strategy when running this insert?
A: High-pressure flood coolant targeted directly at the tool-workpiece interface is strongly advised for stainless steels. This rapid cooling action manages structural heat deflection and assists the GU profile in washing away stringy chips before they wrap around the workpiece.
💡 Technical Grade Comparison & Troubleshooting Guide
Workpiece Material Matrix (ISO Classifications): Primary application domain spans ISO M20 to M30 parameters. Tailored explicitly for medium profiling, copy turning, and light roughing of austenitic grades (SUS304, 316, 316L), ferritic/martensitic stainless alloys (420, 430), and tough duplex compositions (2205).
Machining Troubleshooting Guide: If advanced built-up edge or chipping occurs, confirm your cutting speed (vc) is not too low, or increase coolant delivery pressure. If rapid boundary notch wear occurs, adjust your machining path depth to avoid rubbing against the cast crust, or shift to a tougher insert radius profile.
Authorized Reference Documentation: Physical sizing constraints, pocket mounting tolerances, and international parameters strictly follow the regulatory ISO 1832:2017 blueprint. Cutting recommendations and metallurgical properties are cross-referenced directly from official technical datasheets published by Sumitomo Electric Hardmetal Corp.
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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.
According to our shipping policy, orders are typically processed and shipped within 1–3 business days after confirmation. Delivery generally takes 5–20 business days, depending on your destination and shipping method. Customs clearance or unforeseen delays may affect delivery times. A tracking number is sent by email after shipment.