Tool Steel - Comparison

Comparison

AISI-SAE tool steel grades
Defining property AISI-SAE grade Significant characteristics
Water-hardening W
Cold-working O Oil-hardening
A Air-hardening; medium alloy
D High carbon; high chromium
Shock resisting S
High speed T Tungsten base
M Molybdenum base
Hot-working H H1–H19: chromium base
H20–H39: tungsten base
H40–H59: molybdenum base
Plastic mold P
Special purpose L Low alloy
F Carbon tungsten

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