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S7
S7 Product Guide
Applications | Specifications | Mechanical and Chemical Data | Tolerances
Overview
An oil or air hardened tool steel that exhibits excellent high impact toughness and strength. Typically used in shear blades, dies, chisels, and punches.
Common Trade Names
UNS T41907, AISI Type S7, Shock-Resisting Steel, Super-7
Other Resources
Weight Calculator | Mill Test Reports
Products
S7 Drill Rod | S7 Rectangle Bar
Specifications
ASTM | SAE |
|---|---|
| A681 | J437 |
Applications
- Blades
- Tooling
| S-7 Tool Steel Heat Treatment | ||||
Hardness | Heat Treat Temp. | Quench Medium | Applications | Advantages |
|---|---|---|---|---|
| As Shipped: Rockwell 90-97B
After Heat Treating: Rockwell 55-57C | 1725°-1750°F | Air or Oil | S7 is good for general tooling and molding applications. It possesses high toughness and shock resistance. | While S7 is very tough compared to other tool steels, it doesn't have hardness comparable to the other tool steels. |
| Physical Properties S7 | |||||
| Annealed | Hardened | ||||
|---|---|---|---|---|---|
| Density | 0.283 lb/in3 | 0.283 lb/in3 | |||
| Ultimate Tensile Strength | 97 ksi | 290 ksi | |||
| Yield Tensile Strength | 53 ksi | N/A | |||
| Shear Modulus | 11,000 ksi | 11,000 ksi | |||
| Shear Strength | 61 ksi | N/A | |||
| Hardness Rockwell | Brinell | B90-97 | 188-223 | C55-57 | 560-595 | |||
| Elongation at Break Percentage | 21% | N/A | |||
| Modulus of Elasticity | 28,000 ksi | 28,000 ksi | |||
| Poisson's Ratio | 0.29 | 0.29 | |||
| Machinability Percentage | 95% | N/A | |||
| Melting Point | 2,590-2,660 °F | 2,590-2,660 °F | |||
| Specific Heat | 1.1 x 10^-1 BTU/lb-°F | 1.1 x 10^-1 BTU/lb-°F | |||
| Thermal Conductivity | 276 BTU-in/hr-ft^2-°F | 276 BTU-in/hr-ft^2-°F | |||
| Electrical Conductivity | 7.8% IACS | 7.8% IACS | |||
|
Chemistry Information
|
|
Element |
Percentage |
| Fe | 93.85 |
| C | 0.5 |
| Cr | 3.25 |
| Mo | 1.4 |
| Mn | 0.75 |
| Si | 0.25 |
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