Machining Tool Steel D2 (Cold Work Die Steel): Speeds & Feeds, Tooling & Best Practices

Material Properties & Machinability Profile

Tool Steel D2 (Cold Work Die Steel) is classified as a High-Carbon High-Chromium Cold Work Steel widely specified for mission-critical components requiring Precision blanking dies, rotary slitters, cold forming rolls, and automotive punch tooling..

Engineering Kinematics & Cutting Parameters

• Material Hardness: 58-62 HRC (Hardened).
• Recommended Cutting Speed ($V_c$): 35 - 70 m/min with dedicated substrate coatings.
• Chip Load ($f_z$): Maintained between 0.04 - 0.10 mm/tooth to prevent tool rubbing or excessive mechanical shock.
• Machinability Challenge: High wear resistance from massive chromium carbides; rough in annealed state (210 HB) and finish via hard milling with CBN tooling.
• Tooling Strategy: Employs high-pressure flood coolant (>= 30 bar) and micro-grain carbide or specialized inserts with positive rake geometries.

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