Product Recommendations for Machining SCM420 Steel (For Our Cutting Tools)

SCM420 is a Cr-Mo alloy steel with good strength and moderate hardness before heat treatment.
For high-efficiency drilling, we recommend:

✔ Solid carbide twist drills
— Best for high-speed machining
— Excellent wear resistance and red hardness
— Stable for continuous production

Suggested parameters:

• Surface hardness (annealed): ~HB 180–220
• Cutting speed: 60–120 m/min (depending on diameter)
• Coolant: Internal coolant recommended for deep holes
• Coating: TiAlN / AlTiN for high heat resistance

For micro-holes (0.2–3mm):
Use carbide micro drills with high rigidity to avoid breakage.

For slotting, side milling, or contour machining:

✔ 4-flute / 3-flute carbide end mills
— Sharp cutting edge
— Low vibration
— High stability on alloy steels like SCM420

Recommended coatings:

• AlTiN / TiSiN: Excellent heat resistance
• Nano coating: Ideal for high-speed finishing

Cutting conditions:

• Vc: 80–150 m/min
• Feed: Adjust by flute size to avoid chatter

SCM420 after carburizing reaches HRC 58–62 on the surface.
For this hardness range:

✔ Coated carbide end mills / drills only
(HSS will not withstand the hardness or heat.)

✔ Ceramic or CBN inserts for turning or heavy removal.

For cutting SCM420 bars, tubes, or pre-hardened material:

✔ Carbide-tipped circular saw blades
— High durability
— Fast feed and clean surface
— Less burr and heat generation

Best for mass production sawing operations.

• Use rigid clamping to avoid vibration
• Ensure continuous coolant when drilling deeper than 3*D
• Reduce feed when the material is closer to the hardened surface
• Avoid using uncoated HSS tools for high-speed machining
• For heavy-duty or long-run jobs → prefer carbide tools for longer life

For machining SCM420, we recommend:

• Solid carbide drills for high-speed and accuracy
• Carbide end mills with AlTiN/TiSiN coating
• Carbide-tipped saw blades for fast cutting
• For carburized surfaces (HRC 58–62), use coated carbide or CBN tools only.