(SK85) SK5 Carbon Steel Properties, Composition & Equivalent
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Family: Carbon Steel
Performance Ratings
Performance Radar
Composition
Mechanical Properties
| Hardness (Rockwell) |
Chemical Composition
| Element | Percentage (%) |
|---|---|
| C | 0.80-0.90 |
| Mn | 0.10-0.50 |
| Si | 0.10-0.35 |
| P, ≤ | 0.030 |
| S, ≤ | 0.030 |
| Steel Name | C80U; C90U |
| Designation | C80U; C90U |
| Carbon Steel | SK5 (SK85) |
| Steel Type (UNS) | W1 (T72301); 1086 |
| Steel Name (Material Number) | C80U (1.1525, C90U (1.1535); C85W (1.1830) |
Where to Buy (SK85) SK5 Carbon Steel Properties, Composition & Equivalent
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Description
SK5 steel (SK85 material) is a carbon tool steel commonly used in Japan. After quenching and tempering, it has high hardness and good wear resistance, but the hardness decreases at high temperature. It is often used as a material for tools such as hammers and saws. SK85 is the name of the new JIS G4401 standard to replace the old name SK5. But the name SK5 is still widely used in Japan. The density of SK85 tool steel is 7.84 g/cm3, the annealing hardness is ≤207 HB (annealing temperature is 730-760 °C slow cooling), and the quenching and tempering hardness of the specimen is ≥ 59 HRC (quenching temperature 780 °C, water cooling; tempering temperature 180 °C, air cooling).