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Tool Steels
Tool Steels A4
Principle Design Features
This alloy is one of the Cold Work, Medium Air Hardening type tool steels.
Known Forms
Flat Bar
Forgings-Discs
Hexagon Bar
Open Die Forgings
Round Bar
Seamless Rolled Rings
Square Bar
Billet
Contour Rings
Mandrel Rings
Shafts
Additional Data
Specifications
A681 (A-4),T30104Dismiss
Chemical Elements
| Carbon | 0.95 - 1.05 |
| Chromium | 0.9 - 2.2 |
| Iron | Balance |
| Manganese | 1.8 - 2.2 |
| Molybdenum | 0.9 - 1.4 |
| Phosphorus | 0.03 max |
| Silicon | 0.5 max |
| Sulphur | 0.03 max |
Physical Properties
Density: 0.283lb/in³
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