Work Material Notch Wear (mm) Flank Wear Width (mm)Flank Wear Width (mm) Flank Wear Width (mm) For SmallLathesNon-FerrousHardenedMetalSteelExotic AlloyCast IronStainlessSteelSteelInsert Grades Chipbreaker and Grade Selection Guide for Turning Stainless Steel Stainless Steel Grades AC6020M / AC6030M / AC6040M / AC1030U AC6020M : Combines a high-hardness carbide substrate with excellent wear resistance and a new CVD coating with improved coating strength to achieve both excellent wear resistance and fracture resistance. Achieves long, stable tool life during high-speed cutting. AC6030M : Our 1st recommended grade for turning of stainless steel, achieving long and stable machining. Drastically reduces the abnormal damage common in stainless steel machining, thanks to the improved coating strength and excellent adhesion. AC6040M : Drastically improves reliability in the unstable cutting range, thanks to the excellent adhesion and peel-off resistance of the new PVD coating as well as the improved fracture resistance of the dedicated carbide substrate. AC1030U : High-quality cutting edge grade suppresses adhesion and micro-chipping, realizing excellent machined surface quality. Performance A AC6020M ● Continuous Cutting (Medium Speed) ● Continuous Cutting (High Speed) 0.50 0.25 ◆ ■ 0.40 ●ConventionalCompetitor's Product AAC6020M 0.20 Competitor's Product B ■ Tool (CVD M20) ●0.30 (CVD M20) ■ ●0.15■■■● ●0.20◆■ 0.10 ●■ ■●◆ ■●◆ ■●◆ ■●◆ ●◆ ●◆ ●◆ AC6020M 0.10 ■ ■●◆● ● 0.05 ◆ Conventional Tool●◆ ● 0 10 20 30 0 10 20 30 Cutting Time (min) Cutting Time (min) Work Material: SUS316L Insert: CNMG120408N-GU Work Material: SUS316L Insert: CNMG120408N-GU Cutting Conditions: vc=150m/min, f=0.3mm/rev, ap=2.0mm Wet Cutting Conditions: vc=200m/min, f=0.3mm/rev, ap=2.0mm Wet AC6030M ● Continuous Cutting ● Interrupted Cutting 0.30 Competitor's Product C (CVD M30)0.25 AC6030M Conventional Tool 0.20 0.15 Conventional Tool 0.10 AC6030M Competitor's Product D 0.05 (CVD M30) 0 10 20 30 40 50 0 500 1,000 1,500 2,000 2,500 Cutting Time (min) No. of Impacts until Breakage Work Material: SUS316 Insert: CNMG120408N-EX Work Material: SUS316 Insert: CNMG120408N-GU Cutting Conditions: vc=200m/min, f=0.2mm/rev, ap=2.0mm Wet Cutting Conditions: vc=100m/min, f=0.1mm/rev, ap=1.0mm Wet AC6040M ● Continuous Cutting ● Interrupted Cutting 0.30 Competitor's Product E 0.25 (PVD M40) AC6040M 0.20 0.15 Conventional Tool Conventional Tool 0.10 AC6040M Competitor's Product F 0.05 (PVD M40) 0 10 20 30 40 50 0 1,000 2,000 3,000 4,000 5,000 6,000 Cutting Time (min) No. of Impacts until Breakage Work Material: SUS316 Insert: CNMG120408N-GU Work Material: SUS316 Insert: CNMG120408N-GU Cutting Conditions: vc=150m/min, f=0.2mm/rev, ap=2.0mm Wet Cutting Conditions: vc=230m/min, f=0.23mm/rev, ap=0.8mm Dry A15