Engineering Tools
Reference data for specifying and sourcing fasteners correctly — the numbers a procurement or design engineer actually needs.
Properties at elevated temperature
Approximate % of room-temperature tensile strength retained as temperature rises — indicative only, actual curves vary by the specific alloy and heat treatment.
Carbon / alloy steel (e.g. grade 8.8)
| Temperature | % tensile strength retained |
|---|---|
| 20°C | 100% |
| 100°C | 95% |
| 200°C | 88% |
| 300°C | 78% |
| 400°C | 60% |
| 500°C | 35% |
Stainless steel (A2/A4)
| Temperature | % tensile strength retained |
|---|---|
| 20°C | 100% |
| 100°C | 92% |
| 200°C | 85% |
| 300°C | 80% |
| 400°C | 75% |
| 500°C | 68% |
Stainless steel retains strength better at moderate elevated temperatures than plain carbon steel, due to its different metallurgy — worth considering for fasteners near heat sources (exhaust systems, ovens, process equipment).