300M (0.40C)-Quenched and tempered Bar, forging, tubing: 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 | 300M (0.40C) / Quenched and tempered / Bar, forging, tubing |
| Specifications | AMS 6417 |
| Handbook | MIL-HDBK-5J, 31 January 2003, section 2.3.1.0, Table 2.3.1.0(f) (pdf page 22 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 | all | |
|---|---|---|
| Specification | AMS 6417 | |
| Basis | S | |
| Ftu, MPa | 1862 | |
| Fty, MPa | 1517 | |
| Fcy, MPa | 1627 | |
| Fsu, MPa | 1117 | |
| Fbru (e/D = 1.5), MPa | 2854 | |
| Fbru (e/D = 2.0), MPa | 3489 | |
| Fbry (e/D = 1.5), MPa | 2372 | |
| Fbry (e/D = 2.0), MPa | 2613 | |
| e, % | 8 | |
| E, GPa | 199.9 | |
| Ec, GPa | 199.9 | |
| G, GPa | 75.84 | |
| ν | 0.32 | |
| 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 | F_bru | F_bry |
|---|---|---|---|---|---|---|
| -73 | 105.2 | 106.7 | ||||
| -18 | 101.3 | 102.8 | ||||
| 38 | 99.2 | 98.8 | 98.6 | 99.5 | 99.8 | 99.3 |
| 93 | 98.1 | 94.8 | 91.1 | 97.3 | 97.4 | 96.6 |
| 149 | 96.7 | 90.8 | 86.7 | 96.2 | 96.5 | 95.5 |
| 204 | 95.1 | 86.9 | 83.8 | 95.5 | 96.1 | 94.3 |
| 26 | 92.4 | 82.9 | 81.5 | 94.2 | 95.4 | 93.8 |
| 316 | 88.9 | 78.9 | 78.6 | 91.6 | 91.4 | 91.7 |
| 371 | 83.4 | 74.4 | 74 | 86.5 | 83.7 | 86.9 |
| 427 | 76.9 | 68.4 | 65.7 | 77.4 | 74.5 | 77.9 |
| 538 | 58 | 42.6 | 56.2 | 54.2 | 56.9 | |
| 649 | 35.2 | 23.1 | 37.2 |
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.