9Ni-4Co-0.20C-Quenched and tempered Plate: MIL-HDBK-5J Design Allowables
show US units (ksi, Msi, lb/in³) open the MIL-HDBK-5J tool compare against temperature find alternatives
| Material class | Steel |
| Alloy / temper / form | 9Ni-4Co-0.20C / Quenched and tempered / Plate |
| Specifications | AMS 6523 |
| Handbook | MIL-HDBK-5J, 31 January 2003, section 2.4.2.0, Table 2.4.2.0(b) (pdf page 75 of the chapter file) |
| Dimension bands | 1 |
| Density | 7833 kg/m³ |
Design Mechanical and Physical Properties (room temperature)
Converted from the handbook table (ksi, Msi, lb/in³) and rounded to 4 significant figures; dimension bands in inches with mm in parentheses. Bases: A and B are statistical minimums (99 % and 90 % probability at 95 % confidence), S the specification minimum. Grain directions: L longitudinal, LT long transverse, ST short transverse.
| Dimension band | 0.000–0.250 in (0–6.35 mm) | |
|---|---|---|
| Specification | AMS 6523 | |
| Basis | S | |
| Ftu, MPa | L | 1282 |
| LT | 1310 | |
| Fty, MPa | L | 1193 |
| LT | 1207 | |
| Fcy, MPa | L | 1296 |
| LT | 1289 | |
| Fsu, MPa | L | 786 |
| LT | 786 | |
| e, % | L | … |
| LT | 10 | |
| E, GPa | 198.6 | |
| Ec, GPa | 198.6 | |
| G, GPa | 76.53 | |
| ν | 0.3 | |
| ρ, kg/m³ | 7833 | |
Effect of Temperature
Percent of the room-temperature value against temperature, digitized from the handbook figures (the shortest exposure of each figure, every 10 °F). Strength curves give the allowable at temperature; "after exposure" curves give the room-temperature property after a soak at that temperature.
Strength allowables at temperature, percent of room temperature
Moduli at temperature
| °C | F_tu | F_ty | F_cy | F_su |
|---|---|---|---|---|
| 38 | 99.1 | 99.2 | 98.9 | 98.4 |
| 93 | 96 | 96 | 93.6 | 92.1 |
| 149 | 93.3 | 93 | 89.9 | 87.9 |
| 204 | 91.4 | 90.8 | 87.4 | 85.7 |
| 26 | 90.3 | 89.1 | 86.1 | 84.3 |
| 316 | 88.3 | 86.7 | 83.9 | 81.9 |
| 371 | 83.9 | 82.7 | 79.3 | 77.9 |
| 427 | 78 | 76.1 | 72.3 | 72.7 |
Factors in percent of the room-temperature allowable.
Source and Use
U.S. Department of Defense (2003). Metallic Materials and Elements for Aerospace Vehicle Structures. MIL-HDBK-5J, 31 January 2003 (public domain). The values are the handbook's design allowables as extracted from the chapter tables; check the printed table before use in a certified analysis, and note that MIL-HDBK-5J was superseded by MMPDS, whose later editions may differ. No warranty is given.