SUMITOMO WNMG080404N-EX AC630M (WNMG 431-EX) Carbide Stainless Steel Turning Insert
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SUMITOMO WNMG080404N-EX AC630M (WNMG 431-EX) PVD Carbide Interrupted Stainless Steel Turning Insert
1. Product Overview
"Which indexable carbide insert grade and roughing chipbreaker configuration are best suited to reduce notch wear, resist built-up edge, and eliminate severe work hardening during heavy interrupted turning of exotic stainless steels?"
The SUMITOMO WNMG080404N-EX AC630M (internationally designated in imperial size as WNMG 431-EX) is an industrial-grade, double-sided negative 80° trigon indexable turning insert engineered for heavy roughing to interrupted cutting of austenitic, martensitic, and duplex stainless steels (ISO M30 - M35 classification). Utilizing Sumitomo's breakthrough Absotech Bronze PVD coating technology, the AC630M grade features an ultra-smooth, highly heat-resistant TiAlN-based multi-layer matrix that provides extraordinary resistance to adhesion, chipping, and thermal cracking under high-feed conditions. Paired with the highly stable, heavy-duty EX Type Chipbreaker geometry, this insert manages high cutting forces, eliminates bird-nesting chips, and delivers highly predictable tool life during aggressive metal removal operations on gummy materials.
2. Product Key Features
- Absotech Bronze PVD Coating: Features a smooth, highly crystalline titanium aluminum nitride (TiAlN) coating matrix. This advanced architectural engineering layer dramatically minimizes notch wear and acts as an elite thermal barrier during high-feed stainless steel roughing.
- Heavy-Duty EX-Type Rake Geometry: Specifically engineered with a sharp yet robust cutting edge and a optimized chip deflector basin. The EX profile reduces boundary friction and built-up edge (BUE) during high-impact interrupted cuts while maintaining optimal chip breakability.
- Ultra-Tough Cobalt-Enriched Substrate: The AC630M structural core incorporates a tough gradient tungsten carbide matrix designed to absorb heavy mechanical shock, making it the industry standard for machining uneven stainless steel forgings or interrupted components.
- 6 Indexable Cutting Corners: The negative 80-degree structural trigon layout provides 6 distinct cutting edges per insert, delivering elite processing economy and maximizing shop floors' return on investment (ROI).
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)
Heavy Roughing
| 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 Steel (SUS304 / SUS316 Roughing) | 90 - 180 m/min (295 - 590 SFM) | 0.20 - 0.45 mm/rev (0.008 - 0.018 ipr) |
| Duplex / Martensitic Stainless (SUS329J4L / 420 Interrupted) | 60 - 140 m/min (195 - 460 SFM) | 0.15 - 0.35 mm/rev (0.006 - 0.014 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 stainless steel grade provides maximum operational security across demanding machining environments:
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-power CNC turning centers and heavy-duty multi-tasking lathes (Mazak, Okuma, Haas, Doosan) requiring premium mechanical pocket clamping force.
6. Industrial Grade Comparison Matrix
| Brand | Equivalent Grade Reference | Application Range | Coating Properties |
|---|---|---|---|
| SUMITOMO | AC630M (Target) | ISO M30 - M40 / Maximum Toughness Interrupted Stainless Roughing | Absotech Bronze Ultra-Smooth PVD TiAlN Layer |
| Sandvik Coromant | GC2220 / GC2025 | ISO M35 / Heavy Interrupted Stainless Cut | Inveio / PVD multi-layer coating technology |
| Kennametal | KMS30 / KCPM30 | ISO M30 / Shock-Resistant Stainless Turning | AlTiN-based PVD coating matrix |
| Iscar | IC6025 / IC806 | ISO M30 - M40 / High-Shock Stainless Application | SUMO TEC PVD tough substrate compilation |
7. Why Choose Us & Verified Global Performance Evaluations
Real-world machine shop metrics proving structural edge stability and wear control under heavy impact:
"We turn heavy 316L forged flanges with multiple bolt interruptions. Other inserts suffered severe notch wear within minutes. The Sumitomo AC630M with the EX breaker handles the impact seamlessly. Tool life expanded drastically."
"Hervorragende Wendeschneidplatte für hochlegierten Edelstahl. Der EX-Spanbrecher verhindert Aufbauschneiden komplett. Sehr hohe Standzeit bei unterbrochenem Schnitt."
"Ottima resistenza allo shock termico su Duplex. Il rompitruciolo EX rompe bene anche a forti avanzamenti."
"SUS304の強断続加工で抜群の安定性。チッピングが大幅に減少し、刃先の信頼性が高いので無人加工でも安心して回せます。"
8. Technical Machining FAQ
Q: Why should I choose the AC630M PVD grade over a CVD coated grade for interrupted stainless steel roughing?
A: Interrupted stainless steel turning causes rapid thermal shock and high impact forces. While CVD coatings offer thicker thermal barriers, PVD coatings like Absotech Bronze retain a much sharper cutting edge matrix and feature high compressive residual stress. This structural property significantly prevents micro-chipping and edge flaking during cyclical shock loading.
Q: Is it better to run the WNMG080404N-EX insert wet or dry in interrupted cutting?
A: For heavily interrupted cuts on stainless steel, running with rich flood coolant or high-pressure coolant (HPC) directed precisely at the rake face is recommended to wash away abrasive chips and prevent work hardening. However, if thermal cracking occurs due to cyclical quenching, reducing cutting speed or running dry can stabilize tool life.
Q: Can the EX chipbreaker handle light finishing profiles?
A: The EX configuration is built with an optimized land profile designed specifically for medium-to-heavy roughing. For light finishing cuts (depth of cut less than 1.0mm), a lighter deflector geometry like Sumitomo's EM or EG Type should be selected to avoid material deflection and poor surface finish.
💡 Technical Grade Comparison & Troubleshooting Guide
Workpiece Material Matrix (ISO Classifications): Primary application domain covers ISO M30 to M40 parameters. Engineered for continuous-to-heavily interrupted cutting of austenitic stainless steels (SUS304/316), duplex steels (SUS329), and precipitation-hardening alloys.
Machining Troubleshooting Guide: If severe built-up edge occurs, increase the cutting speed (vc) or coolant concentration. If rapid mechanical chipping occurs at the nose radius, verify pocket alignment, reduce the feed rate (f), or increase the tool nose radius to 0.8mm (WNMG080408N-EX).
Authorized Reference Documentation: Physical dimensional standards and mounting tolerances strictly follow the regulatory ISO 1832:2017 blueprint. Performance data, structural wear parameters, and substrate configurations are cross-referenced from verified technical catalogs 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.