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A2
A2 Product Guide
Applications | Specifications | Mechanical and Chemical Data | Tolerances
Overview
An air-hardening tool steel with good strength and with excellent stability in heat treatment. A-2 exhibits wear resistance that falls between O-1 and D-2 steel. Typically used in punches, dies, cutting tools in woodworking, tooling for plastic, dowel pins, hammers, and industrial knives.
Common Trade Names
UNS T30102, AISI Type A2, AISI Medium-Alloy, Air-Hardening Tool Steels A2, Air-True
Other Resources
Weight Calculator | Mill Test Reports
Products
A2 Drill Rod | A2 Rectangle Bar | A2 Square Bar
Applications
- Dowel Pins
- Blades
- Punches
- Dies
- Tooling
- Hammers
Specifications
ASTM | SAE |
|---|---|
| A681 | J437 |
| A-2 Tool Steel Heat Treatment | ||||
Hardness | Heat Treat Temp. | Quench Medium | Applications | Advantages |
|---|---|---|---|---|
| As Shipped: Rockwell 94-99B
After Heat Treating: Rockwell 59-62C | 1700°-1900°F | Air | A2 can be used in the same applications as both O1 and W1. | The heat-treated air-hardening steels have deeper hardenability and there is less movement or distortion during heat treatment. |
| Physical Properties A2 | |||||
| Annealed | Hardened | ||||
|---|---|---|---|---|---|
| Density | 0.284 lb/in3 | 0.284 lb/in3 | |||
| Ultimate Tensile Strength | 100 ksi | 300 ksi | |||
| Yield Tensile Strength | 50 ksi | N/A | |||
| Shear Modulus | 11,300 ksi | 11,300 ksi | |||
| Shear Strength | 65 ksi | N/A | |||
| Fatigue Strength | 35 ksi | N/A | |||
| Hardness Rockwell | Brinell | B94-99 | 200-235 | C59-62 | 634-688 | |||
| Elongation at Break Percentage | 21% | N/A | |||
| Modulus of Elasticity | 29,400 ksi | 29,400 ksi | |||
| Poisson's Ratio | 0.30 | 0.30 | |||
| Machinability Percentage | 65% | 65% | |||
| Melting Point | 2,570-2,650 °F | 2,570-2,650 °F | |||
| Specific Heat | 1.1 x 10^-1 BTU/lb-°F | 1.1 x 10^-1 BTU/lb-°F | |||
| Thermal Conductivity | 264 BTU-in/hr-ft^2-°F | 264 BTU-in/hr-ft^2-°F | |||
| Electrical Conductivity | 8.2% IACS | 8.2% IACS | |||
|
Chemistry Information
|
|
Element |
Percentage |
| C | 0.95 - 1.05 |
| Cr | 5.13 |
| Fe | 91 |
| Mn | 1 max |
| Mo | 1.15 |
| P | 0.03 max |
| Si | 0.5 max |
| S | 0.03 max |
| V | 0.33 |
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