| JS-777 | |
 | |
| Category | Steel |
| Class | Stainless steel |
| Type | Austenitic nonstandard |
| Composition | |
| |
| Element | Weight % |
| C | 0.04 |
| Mn | 2.00 |
| Si | 1.00 |
| Cr | 19.0-23.0 |
| Ni | 24.0-26.0 |
| P | 0.045 |
| S | 0.035 |
| Mo | 4.0-5.0 |
| Cu | 1.9-25 |
| Mechanical Properties | |
| |
| Properties | Conditions | ||
| T (°C) | Treatment | ||
| Density (×1000 kg/m3) | 7.7-8.03 | 25 | |
| Poisson's Ratio | 0.27-0.30 | 25 | |
| Elastic Modulus (GPa) | 190-210 | 25 | |
| Tensile Strength (Mpa) | 550 | 25 | annealed (bar, plate, sheet, strip) |
| Yield Strength (Mpa) | 240 | ||
| Elongation (%) | 30 | ||
| Reduction in Area (%) | 40 | ||
| Hardness (HRB) | 95 (max) | 25 | annealed (bar, plate, sheet, strip) |