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CBN Inserts
CBN Inserts for Hardened Steel, Cast Iron and Hard Turning
Huamin Tools manufactures CBN inserts for hardened steel, cast iron and high-speed turning applications. Our cubic boron nitride cutting inserts are available in ISO shapes such as CNGA, TNGA, SNGA, DNGA, WNGA and RNGN, with grade options for continuous cutting, interrupted cutting, finishing and roughing.
CBN Inserts for Hardened Steel Machining
CBN inserts are widely used for turning hardened steel, bearing steel, die steel, high-speed steel and other hard materials after heat treatment. Compared with carbide inserts, CBN cutting tools can support higher cutting speed, better dimensional stability and longer tool life in hard turning operations.
CBN Inserts for Cast Iron Turning
For gray cast iron, chilled cast iron, high chromium cast iron and powder metallurgy materials, CBN inserts provide strong wear resistance and stable edge performance. Different CBN grades can be selected according to cutting speed, workpiece hardness, machining allowance and whether the operation is continuous or interrupted.
Common CBN Insert Shapes
Huamin Tools supplies CBN inserts in common ISO turning insert shapes, including CNGA, TNGA, SNGA, DNGA, WNGA, RNGN, CCGW and other customized geometries. The suitable insert shape depends on the workpiece material, machining method, holder type and required surface finish.
CBN Inserts Grade
Chilled Cast Iron, Hi-Ni-Cr Cast Iron and High harness alloy cast iron
High Speed Steel
Hardened Steel, Heat and abrasion resistant steel, High manganese steel
Hardened Steel
Gray Cast Iron
Hardened Steel
Hardened steel, other materials of difficult to machine
Gray Cast Iron
Gray cast iron, Iron based alloy
Hardened Steel
Hardened Steel, high strength cast iron
Hardened Steel
Powder Metallurgy
Gray Cast Iron, Powder Metallurgical
Hardened Steel
Hardened Steel
Hardened Steel
Recommended Workpiece Materials
CBN inserts are recommended for hardened steel, bearing steel, gear steel, die steel, high chromium cast iron, gray cast iron, ductile iron, powder metallurgy components and selected heat-resistant ferrous materials. Typical applications include hard turning after heat treatment, bearing ring finishing, gear finishing, brake disc machining, roll machining and large cast iron component finishing.
For aluminum, copper, brass, graphite and most non-ferrous materials, PCD inserts are usually a better first choice than CBN.
CBN Grade Selection and Technical Reference
For stable finishing of hardened steel, choose a grade focused on edge stability, wear resistance and surface finish. For interrupted cutting, roughing, heavy scale or unstable workholding, choose a tougher grade with better impact resistance. Final selection should consider workpiece hardness, cutting speed, feed rate, depth of cut, coolant condition, machine rigidity and required surface roughness.
CBN Insert Application Reference Table
| Machining condition | Typical workpiece | Selection direction |
|---|---|---|
| Continuous finishing | Hardened steel, bearing steel, gear steel | Prioritize edge stability, dimensional accuracy and surface finish. |
| Interrupted cutting | Keyways, holes, rough surfaces, scale | Prioritize toughness and impact resistance. |
| Cast iron turning | Gray cast iron, chilled cast iron, high chromium cast iron | Prioritize wear resistance and thermal stability. |
| Powder metallurgy | Sintered ferrous parts and porous materials | Confirm edge preparation and grade toughness with application testing. |
Engineering Review Note
Reviewed by Huamin Tools Application Engineering Team. Recommendations are based on CBN insert use in hardened steel, cast iron and difficult-to-machine ferrous materials. Before production use, cutting parameters should be confirmed against the actual workpiece, machine rigidity, clamping condition and tool life target.
CBN Inserts FAQ
What Are CBN Inserts?
How Are CBN Inserts Used?
Hardened Steel Machining
Ideal for turning, boring and milling of quenched and tempered steel, bearing steel, die steel and high-hardness structural steel. It realizes high-efficiency hard turning instead of grinding.
Cast Iron Processing
Suitable for high-speed cutting of gray cast iron, ductile iron and alloy cast iron. With excellent wear resistance, it greatly improves production efficiency and reduces tool consumption.
Powder Metallurgy & Sintered Materials
Used for cutting powder metallurgy parts, sintered alloys and other porous high-hardness workpieces.
High-temperature & Heat-resistant Alloys
Applied to the machining of high-temperature alloys, high-strength wear-resistant alloys and difficult-to-cut workpieces under high-temperature cutting conditions.
Mass Production in Core Industries
Widely used in automobile parts, bearings, molds, engineering machinery, aerospace and other industries, for mass semi-finishing and finishing processes.
Dry Cutting & High-speed Machining
Adaptable to dry cutting and high-speed cutting processes, cutting down coolant cost, simplifying processing procedures and lowering overall manufacturing cost.
What materials are CBN inserts used for?
CBN inserts are mainly used for hardened steel, cast iron, high-speed steel, powder metallurgy and other difficult-to-machine ferrous materials.
Are CBN inserts suitable for aluminum?
CBN inserts are not the first choice for aluminum. PCD inserts are usually recommended for aluminum and other non-ferrous materials.
Can Huamin Tools provide custom CBN inserts?
Yes. Huamin Tools can provide CBN inserts in standard ISO shapes and customized specifications according to drawing, workpiece material and machining conditions.
How do I choose the right CBN grade?
The grade should be selected according to workpiece material, hardness, cutting speed, machining allowance and whether the operation is continuous or interrupted.
Information to Send Before RFQ
To recommend a suitable CBN insert grade and edge preparation, please send the workpiece material, hardness, machining operation, current insert model, cutting speed, feed rate, depth of cut, coolant condition, interruption level, required surface roughness and main tool life problem. Drawings, photos, current tool wear images and target cycle time are helpful for application review.
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