Table 5. Quick Reference Guide for Tool Steel Selection
Tool Steel Categories and AISI Letter Symbol
High-Speed Tool Steels, M and T
Hot-Work Tool Steels, H
Cold-Work Tool Steels, D, A, and O
Shock-Resisting Tool Steels, S
Special-Purpose Tool Steels, L and F
Water-Hardening Tool Steels, W
Application Areas
Mold Steels, P
Examples of Typical Applications
Cutting Tools Single-point types (lathe, planer, boring) Milling cutters Drills Reamers Taps Threading dies Form cutters
General-purpose production tools: M2, T1 For increased abrasion resistance: M3, M4, and M10 Heavy-duty work calling for high hot hardness: T5, T15 Heavy-duty work calling for high abrasion resistance: M42, M44 For combining hot hardness with high abrasion resistance: M2, T1
Tools with keen edges (knives, razors) Tools for
Pipe cutter wheels
Uses that do not require hot hardness or high abrasion resistance. carbon content of applicable group: (1.05 / 1.10% C) (1.10 / 1.15% C) (1.20 / 1.25% C) (1.35 / 1.40% C) Smith’s tools Hot chisels (0.70 / 0.75% C) Drop forging dies (0.90 / 1.00% C) Applications Examples with Taps Reamers Twist drills Files (1.65 / 0.70% C) limited to short- run production
operations where no high-speed is involved, yet stability in heat treatment and substantial abrasion resistance are needed
Dies for presses and hammers: H20, H21 For severe conditions over extended service periods: H22 to H26, also H43 Extrusion dies and dummy blocks: H20 to H26 For tools that are exposed to less heat: H10 to H19
Hot Forging Tools and Dies Dies and inserts Forging machine plungers and pierces Hot Extrusion Tools and Dies Extrusion dies and mandrels Dummy blocks Valve extrusion tools
Hot trimming dies: D2
Hot trimming dies Blacksmith tools Hot swaging dies
Brass extrusion dies: T1
Compression
molding: S1
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