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O1
O1 Product Guide
Applications | Specifications | Mechanical and Chemical Data | Tolerances
Overview
Oil-hardening, general purpose tool steel that holds its size and shape with excellent accuracy when being heat treated. While not as strong or wear resistant as A-2 or D-2, it experiences significantly less distortion during the heat treating process. Typically used in rolls, punches, shear knives, food processing knives, and gauges.
Common Trade Names
UNS T31501, AISI Type O1, Presco, Oilcrat
Other Resources
Weight Calculator | Mill Test Reports
Products
O1 Drill Rod | O1 Rectangle Bar | O1 Square Bar
Specifications
ASTM | SAE |
|---|---|
| A681 | J437 |
Applications
- Blades
- Gauges
- Tooling
| O-1 Tool Steel Heat Treatment | ||||
Hardness | Heat Treat Temp. | Quench Medium | Applications | Disadvantages |
|---|---|---|---|---|
| As Shipped: Rockwell 88-95B
After Heat Treating: Rockwell 62-64C | 1450°-1600°F | Oil | Taps, Reamers, Knurling Tools, Shear Blades, Drills, Coining Dies, Trimming Dies | Oil hardening tool steels tend to experience less distortion during the quench operation, but they do still show distortion from the original size. The hardening operation is more thorough than with water hardening steels, but not as thorough as the air-hardening grades. |
| Physical Properties O1 | |||||
| Annealed | Hardened | ||||
|---|---|---|---|---|---|
| Density | 0.283 lb/in3 | 0.283 lb/in3 | |||
| Ultimate Tensile Strength | 104.5 ksi | 300 ksi | |||
| Yield Tensile Strength | 58 ksi | N/A | |||
| Shear Modulus | 11,200 ksi | 11,200 ksi | |||
| Shear Strength | 58 ksi | N/A | |||
| Fatigue Strength | 40 ksi | N/A | |||
| Hardness Rockwell | Brinell | B88-95 | 177-212 | C62-64 | 688-722 | |||
| Elongation at Break Percentage | 20% | N/A | |||
| Modulus of Elasticity | 31,000 ksi | 31,000 ksi | |||
| Poisson's Ratio | 0.30 | 0.30 | |||
| Machinability Percentage | 95% | N/A | |||
| Melting Point | 2,580-2,660 °F | 2,580-2,660 °F | |||
| Specific Heat | 1.1 x 10^-1 BTU/lb-°F | 1.1 x 10^-1 BTU/lb-°F | |||
| Thermal Conductivity | 300 BTU-in/hr-ft^2-°F | 300 BTU-in/hr-ft^2-°F | |||
| Electrical Conductivity | 7.4% IACS | 7.4% IACS | |||
|
Chemistry Information
|
|
Element |
Percentage |
| C | 0.94 |
| Fe | 96.56 |
| Cr | 0.5 |
| Mn | 1.2 |
| Si | 0.3 |
| W | 0.5 |
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