SUMITOMO WNMG080404N-LU AC630M Stainless Steel Turning Insert (WNMG 431-LU Metric & Imperial)
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SUMITOMO WNMG080404N-LU AC630M (WNMG 431-LU) Absotech PVD Carbide Stainless Steel Turning Insert
1. Product Overview
"Which indexable turning insert grade and chipbreaker geometry are most reliable for heavy-duty, interrupted roughing of austenitic and duplex stainless steel to prevent work hardening and boundary notch wear?"
The SUMITOMO WNMG080404N-LU AC630M (internationally designated under imperial nomenclature as WNMG 431-LU) is a heavy-duty indexable turning insert engineered specifically to conquer the extreme thermal and mechanical demands of stainless steel machining. Utilizing Sumitomo's proprietary Absotech PVD coating matrix paired with a highly reinforced, low-resistance LU Type Chipbreaker geometry, this double-sided negative trigon insert delivers exceptional boundary defect resistance, eliminates work-hardening failures, and provides excellent edge toughness during heavy interrupted cuts or rough scaling operations.
2. Product Key Features
- Absotech PVD Coating Technology: Engineered with an ultra-smooth, highly heat-resistant TiAlN-based multi-layered PVD coating. This micro-structural layout significantly reduces adhesion, adhesion-induced chipping, and welding wear commonly caused by gummy stainless steels.
- Heavy-Duty LU-Type Chip Breaker: Features a robust, specialized deflector wall and a negative land configuration designed to handle deep depths of cut (ap = 1.5mm - 5.0mm) and high feed rates. It cleanly breaks tough, stringy stainless steel chips, preventing bird-nesting around the machine chuck.
- Premium High-Toughness Substrate: Built on a customized, shock-resistant submicron carbide matrix that effectively suppresses micro-cracking and resists sudden edge fracturing under severe interrupted cutting conditions.
- 6 Economical Cutting Edges: The negative 80-degree trigon structural configuration balances the structural rigidity of a round insert with the profiling flexibility of a standard diamond, yielding 6 distinct indexable cutting edges for optimized operational economy.
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 Rough 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 Structural Cutting Parameters
| Workpiece Material Category | Cutting Speed (vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Austenitic Stainless (304, 316, 316L Heavy Roughing) | 80 - 160 m/min (260 - 525 SFM) | 0.20 - 0.45 mm/rev (0.008 - 0.018 ipr) | 1.5 - 5.0 mm (0.059 - 0.197 in) |
| Duplex / Super Duplex Stainless (2205, 2507 Interrupted Cut) | 60 - 120 m/min (195 - 395 SFM) | 0.18 - 0.40 mm/rev (0.007 - 0.016 ipr) | 1.2 - 4.0 mm (0.047 - 0.157 in) |
This WNMG0804 / WNMG432 sequence 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 high-toughness PVD matrix provides absolute reliability in critical industries processing difficult-to-machine stainless materials:
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 diameter >= 40mm).
- Machine Rigidity Support: Tailored for heavy multi-tasking CNC centers and sturdy industrial lathes (Mazak, Mori Seiki, Okuma) executing high-load rigid tool clamping.
6. Industrial Grade Comparison Matrix
| Brand | Equivalent Grade Reference | Application Range | Coating Type |
|---|---|---|---|
| SUMITOMO | AC630M (Target) | ISO M25 - M35 / Heavy Interrupted Stainless Turning | Absotech PVD Super-Multi TiAlN |
| Sandvik Coromant | GC2035 / GC2220 | ISO M35 / Tough Interrupted Stainless Cut | Inveio PVD Coating |
| Kennametal | KCM35B / KC5025 | ISO M35 / High Shock Stainless Steel | PVD TiAlN / TiN |
| Iscar | IC6035 / IC908 | ISO M30 - M40 / High-Impact Interrupted Cutting | PVD TiAlN Alpha Matrix |
7. Verified Global Performance Evaluations
Real-world machine shop metrics proving structural edge stability and wear control:
"Roughing forged 316L pump jackets was killing our tool life due to extreme notch wear. Switched to these Sumitomo AC630M inserts with the LU breaker, and the depth-of-cut notch wear completely stopped. Getting 45 minutes of solid cut-time per corner now."
"Hervorragende Leistung bei unterbrochenem Schnitt auf Duplex 2205. Die Absotech PVD-Beschichtung reduziert die Aufbauschneidenbildung drastisch. Sehr stabile Standzeiten auch bei starker Schnitttiefe."
"Ottimo controllo del truciolo con il rompitruciolo LU su flange in acciaio inox. La stabilità del tagliente riduce i fermi macchina. Consegna rapida, prodotto originale al 100%."
"SUS304の黒皮・強断続加工用に導入。従来のPVDコーティングでは凝着によるチッピングが頻発していましたが、AC630MのAbsotechコートは溶着を劇的に抑えてくれます。LUブレーカの低抵抗設計のおかげで、重切削でもビビらず非常に安定した加工が可能です。"
8. Technical Machining FAQ
Q: Why should I choose the PVD-coated AC630M grade instead of a CVD-coated stainless steel grade like AC6020M?
A: The AC630M is a dedicated high-toughness PVD grade designed specifically to resist the severe impact mechanical shocks of interrupted cuts and heavy scale roughing (ISO M25-M35). CVD grades like AC6020M are harder and better suited for continuous, high-speed turning. Choose AC630M when your process experiences edge chipping or unexpected fracture under heavy shock loads.
Q: What is the optimal operational range for the LU chipbreaker when turning stainless steel?
A: The LU chipbreaker features a highly reinforced land width designed for high-feed roughing at deep depths of cut (ap >= 1.5mm). If you drop the depth of cut below 1.0mm, the stringy stainless chip will bypass the deflector groove, causing long ribbons. For light finishing or medium cutting, select the GU or EM chipbreaker profiles instead.
Q: Is flood coolant required for machining stainless steel with the AC630M grade?
A: While the Absotech PVD coating provides excellent thermal protection, flood coolant is highly recommended for roughing stainless steel. Continuous coolant delivery aids in chip evacuation, lowers the zone temperature to prevent work-hardening, and extends tool life. Ensure the coolant supply is steady to avoid thermal cycling cracks.
💡 Technical Grade Comparison & Troubleshooting Guide
Workpiece Material Matrix (ISO Classifications): Primary application falls within ISO M25 to M35 guidelines. Formulated for austenitic stainless steels (304, 316, 317), ferritic/martensitic alloys, and difficult duplex/super duplex grades exhibiting erratic scale variations.
Machining Troubleshooting Guide: If severe built-up edge (BUE) or chip welding occurs, increase the surface cutting speed (vc) to pass out of the material's adhesion temperature zone, or check the concentration of your water-soluble coolant. If rapid boundary notch wear develops, modify the depth of cut (ap) progressively across passes to spread out the work-hardened layer touchpoint.
Authorized Reference Documentation: Sizing geometries, mechanical pocket specifications, and dimensional tolerances fully comply with international ISO 1832:2017 standards for indexable cutting inserts. Performance envelopes are cross-verified using verified technical datasets 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.
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