Young's Modulus of Type 304 Stainless Steel
| Value | 1.93e11 Pa |
| Status | Measured: ± 5,000,000,000 Pa (0.026 relative) |
| Source | ASM Handbook, Vol. 1: Properties and Selection — Irons and Steels |
| Categories | Material PropertiesEngineering & Trademechanics |
| pascal | 193,000,000,000 Pa |
| kilopascal | 193,000,000 kPa |
| megapascal | 193,000 MPa |
| bar | 1,930,000 bar |
| atmosphere | 1,904,761.9 atm |
| millimeter of mercury | 1,447,618,800 mmHg |
| pound per square inch | 27,992,283 psi |
| foot of water column | 64,568,645 ft H₂O |
| gigapascal | 193 GPa |
| kip per square inch | 27,992.283 ksi |
| inch of mercury | 56,992,868 inHg |
| inch of water column | 774,823,740 in w.g. |
Learning zone
Austenitic stainless steels are face-centred cubic rather than body-centred cubic, and the change of crystal structure costs a few percent of stiffness: 193 GPa for 304 and 316 against 200 GPa for carbon steel. For most work that difference is noise, and designers reach for the same 29 000 ksi. Where it shows up is in precision positioning, spring rates and long, slender stainless members, where 3 % of extra deflection is 3 % you did not budget.
The bigger differences between stainless and carbon steel are elsewhere. Stainless expands about 50 % more per degree (17.3 vs 11.7 µm/m·K), conducts heat about a third as well (16 vs 50 W/m·K), and work-hardens aggressively, so cold-formed and cold-drawn stainless has a yield strength far above the annealed 205 MPa in the datasheet. Take 193 GPa as annealed-condition sheet and bar at room temperature; duplex and precipitation-hardening grades run 195–200 GPa, and all of them soften with temperature.