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Milling inserts and grades for cast iron

Choosing the right insert grades for cast iron milling has never been easier. Find the perfect insert grade for your cast iron milling operation here.

GC3330

​Hard CVD-caoted grade with thick Inveio™ coating is designed for medium to rough milling of all types of cast iron in aver to stable conditions for wet and dry machining.

Benefits and f​eatures​

  • Inveio™ coating enables high wear resistance and long tool life
  • Secure grade with predictable wear
  • Broad application area – same insert for many applications
  • First choice in grey cast iron and mixed ISO K applications

Made for Milling

You make the components that shape the things around us. We create precision tools that are purposely #MadeforMilling.

Learn more

Inveio™ – uni-directional crystal orientation

Tightly packed uni-directional crystals create a strong barrier towards the cutting zone and chip for improved crater and flank wear resistance.

GC3330 leads the way for cast iron milling

With predictable performance becoming increasingly important in many machining processes, GC3330 is meeting the needs of today’s manufacturing.

Getting started with cast iron milling

Cast iron can be divided into malleable, grey, nodular, compact graphite iron (CGI), and austempered ductile iron (ADI).​ Learn more about how to overcome common challenges.

Find your grade

Our wide range of cast iron insert grades include CVD-, PVD-coated and uncoated carbide grades, and CBN-tipped and ceramic insert grades for various machining conditions. Use the information below to find the right grade for your production.

Stable conditions
Unstable conditions
  Low heat

(Small cutters
and/or low vc, ae)

High heat

(Large cutters
and/or high vc, ae)

​​

GC3330

H​ard CVD-coated grade with thick coating, designed for medium to rough milling of all cast iron in average to stable conditions, both dry and wet. First choice in grey cast iron and mixed ISO K applications.

CoroMill® 331: High-quality grooving and parting-off.

CoroMill® 345: First-choice face milling cutters for high productivity.

CoroMill® 365: Face milling in cast iron and steel.

CoroMill® 390: Versatile shoulder milling and ramping cutters for mixed production.

CoroMill® 490: The first choice for general and repeated shoulder milling.

See complete assortment

GC1020

Hard PVD-coated grade with thin coating for light rough to finishing of nodular cast iron in dry and wet conditions, and grey cast iron in wet and average to stable conditions. First choice for nodular cast iron and/or small diameter cutters.

CoroMill® 331: High-quality grooving and parting-off.

CoroMill® 345: First-choice face milling cutters for high productivity.​

CoroMill® 365: Face milling in cast iron and steel.

CoroMill® 390: Versatile shoulder milling and ramping cutters for mixed production.

CoroMill® 490: The first choice for general and repeated shoulder milling.

See complete assortment

GC3220

​Hard CVD-coated grade with very thick coating, designed for high cutting speeds in medium to rough grey cast milling applications with good stability in dry conditions.

CoroMill®​​ 245: Multipurpose face milling cutters for mixed production.

CoroMill® 331: High-quality grooving and parting-off.

CoroMill® 345: First-choice face milling cutters for high productivity.

CoroMill® 490: The first choice for general and repeated shoulder milling.​

See complete assortment

GC3040

Medium-hard CVD grade with thick coating for tough and demanding medium to rough milling applications of grey cast iron in dry conditions.​

CoroMill® 245: Multipurpose face milling cutters for mixed production.

CoroMill® 331: High-quality grooving and parting-off.

CoroMill® 345: First-choice face milling cutters for high productivity.

CoroMill® 390: Versatile shoulder milling and ramping cutters for mixed production.

CoroMill® 490: The first choice for general and repeated shoulder milling.

See complete assortment

K20W

​Hard CVD-coated grade with thin coating for finishing to light rough milling of all cast iron​ in stable and wet conditions. Ideal for large diameter cutters.

Auto Roughing: Extra-close pitch face milling cutter.

CoroMill® 345: First-choice face milling cutters for high productivity.

CoroMill® 365: Face milling in cast iron and steel.

CoroMill® 425: Easily adjustable finish face milling.

CoroMill® 745: Multi-edge face milling cutter for best production economy in steel and cast iron.

See complete assortment

K20D

​Hard CVD-coated grade with very thick coating designed for high cutting speed in medium to rough grey cast iron milling applications with good stability in dry conditions.

Auto Roughing: Extra-close pitch face milling cutter.

CoroMill® 365: Face milling in cast iron and steel.

CoroMill® 745: Multi-edge face milling cutter for best production economy in steel and cast iron.

See complete assortment

Complementary grades

CB50

Hard CBN-tipped grade for light roughing to finishing of grey cast iron in stable, dry conditions. Use when dimensional stability and long tool life are critical.

View complete ​assortment

CC6190

​Hard silicon nitride ceramic grade for very high cutting speeds in light roughing to semi-finishing of grey cast iron in stable and dry conditions.

View complete ​assortment

GC1010

​Very hard PVD-coated grade with thin coating for finishing in very stable conditions. A harder complement to GC1020 in wet conditions.

View complete ​assortment

H13A

​Hard uncoated carbide grade for rough to finish milling with sharp cutting edges, at low speeds and in average to stable, dry and wet conditions.

View complete ​assortment

GC4240

​Tough CVD-coated grade with medium-thick coating, for use as a tougher complement to GC3040 when stability is poor, in dry and wet conditions.

View complete ​assortment

GC4230

Medium-hard CVD-coated grade with medium-thick coating, for toughness-demanding, medium to rough milling applications of nodular cast iron in dry and wet conditions.

View complete ​assortment

K20M

​Hard CVD-coated grade with medium-thick coating, for medium to rough milling in various applications of all kinds of cast iron, mainly dry conditions.

View complete ​assortment

K15W

Hard CVD-coated grade with thin coating for finishing of cast iron and bi-metal components such as cast iron and aluminium in stable and wet conditions. Use as a complement to K20W when a sharp edge is needed.

View complete ​assortment

Highlights

Milling - initial considerations

Milling has evolved into a machining method with a very broad range of operations. Configurations have to be carefully considered before milling.

Struggling to find the right tool?

Let CoroPlus™ ToolGuide help you get quick and accurate tool recommendations – on all your devices!

Heptagonal innovation

See how you can remove all problems related to negative cutting actions in your double-sided face milling operations.

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