9Ni-4Co-0.30C-Quenched and tempered Bar, forging, and tubing: MIL-HDBK-5J Design Allowables
show SI units (MPa, GPa, kg/m³) open the MIL-HDBK-5J tool compare against temperature find alternatives
| Material class | Steel |
| Alloy / temper / form | 9Ni-4Co-0.30C / Quenched and tempered / Bar, forging, and tubing |
| Specifications | AMS 6526 |
| Handbook | MIL-HDBK-5J, 31 January 2003, section 2.4.3.0, Table 2.4.3.0(b) (pdf page 80 of the chapter file) |
| Dimension bands | 1 |
| Density | 0.28 lb/in3 |
Design Mechanical and Physical Properties (room temperature)
As printed in the handbook table. 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 | 0–4 in | |
|---|---|---|
| Specification | AMS 6526 | |
| Basis | S | |
| Ftu, ksi | L | 220 |
| Fty, ksi | L | 190 |
| Fcy, ksi | L | 209 |
| Fsu, ksi | L | 137 |
| Fbru (e/D = 1.5), ksi | L | 346 |
| Fbru (e/D = 2.0), ksi | L | 440 |
| Fbry (e/D = 1.5), ksi | L | 291 |
| Fbry (e/D = 2.0), ksi | L | 322 |
| e, % | L | 10 |
| E, Msi | 28.5 | |
| Ec, Msi | 29.8 | |
| ρ, lb/in3 | 0.28 | |
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
| °F | F_tu | F_ty | F_cy | F_su | F_bru | F_bry |
|---|---|---|---|---|---|---|
| -100 | 105.8 | 107.4 | ||||
| 0 | 102.4 | 103 | 102.5 | 101.6 | 101.2 | 101.3 |
| 100 | 98.6 | 98.7 | 98.3 | 98.2 | 98.5 | 98.8 |
| 200 | 95.4 | 94.8 | 94.7 | 95.4 | 95.9 | 96.4 |
| 300 | 92.8 | 91.4 | 90.9 | 92.8 | 93.6 | 94.6 |
| 400 | 91.2 | 89.1 | 87.5 | 90.3 | 91.3 | 93.3 |
| 500 | 84.6 | 87.6 | 88.8 | 92.7 |
Factors in percent of the room-temperature allowable.
Other 9Ni-4Co-0.30C Tables
- 9Ni-4Co-0.30C-Quenched and tempered Sheet, strip, and plate (Table 2.4.3.0(b))
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.