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Milling inserts and grades for hardened steel

Modern milling insert grades for hardened steel are designed for productive machining at realistic costs per part. Find the right insert grade for your operation here.

GC1010

GC1010 is a PVD-coated grade for light roughing to finishing operations. Because of its exceptional resistance to plastic deformation, thermal cracking and other types of wear, this grade can withstand long periods of time in cut and is suitable for machining hardened steel from 36 HRC and higher.

Benefits and f​eatures​

  • First-choice grade for hardened steel
  • High cutting speeds
  • Offers security and long tool life

Made for Milling

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

Learn more

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!

Milling hard steel

Discover more about this material group which contains hardneded and tempered steel with hardness >45-65 HRC.

Find your grade

Our milling grade chain for hardened steel includes PVD and CVD carbide grades along with CBN-tipped grades, cermets and ceramics 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)

​​

GC1010

Hard PVD grade with a thin coating for light roughing to finishing of hardened steel with 36 HRC and higher and should be used in stable conditions for both wet and dry machining.

CoroMill® ​216: Ball nose cutters for roughing to semi-finishing.

CoroMill® 216F: Ball nose cutters for finishing.

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

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

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

See complete assortment

GC4220

​Hard CVD grade with a thick coating for light roughing to finishing at low feeds, moderate speeds and large radial engagements in the lower ISO H hardness range for both we and dry machining.

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

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

See complete assortment

Complementary grades

GC1130

Hard, thin coated PVD grade with Zertivo™ technology for light roughing to finishing at low feeds, moderate speeds and small radial engagements in the lower ISO H hardness range for both wet and dry machining.

View complete ​assortment

GC1030

​Hard, thin coated PVD grade for light roughing to finishing at low feeds, moderate speeds and small radial engagement in the lower ISO H hardness range for both wet and dry machining.

View complete ​assortment

CT530

​Medium-hard uncoated cermet grade for light finishing in stable and dry conditions.

View complete ​assortment

CB50

​Hard CBN-tipped grade for semi-finishing to finishing in very stable and dry conditions. Use when dimensional stability and long tool life are crucial.

View complete ​assortment

GC3040

Medium-hard, thick coated CVD grade that can be used as a backup to GC4220 in unstable and dry conditions.

View complete ​assortment

CC6190

Hard silicon nitride ceramic grade for light roughing to semi finishing of chilled cast iron at stable and dry conditions.

View complete ​assortment

Highlights

Zertivo™ grade GC1130

Get set for a productive milling future with the impressive combination of CoroMill® 390 and GC1130.

The secret behind GC1130

Zertivo™ is a unique production technology bringing longer tool life and enhanced security to PVD grades.

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