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280 Maraging-Maraged at 900 F Sheet: MIL-HDBK-5J Design Allowables

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Material class	Steel
Alloy / temper / form	280 Maraging / Maraged at 900 F / Sheet
Specifications	AMS 6521
Handbook	MIL-HDBK-5J, 31 January 2003, section 2.5.1.0, Table 2.5.1.0(c) (pdf page 95 of the chapter file)
Dimension bands	1
Density	0.286 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		0.000–0.187 in
Specification		AMS 6521
Basis		S
F_tu, ksi	L	271
F_tu, ksi	LT	280
F_ty, ksi	L	262
F_ty, ksi	LT	270
F_cy, ksi	L	244
F_cy, ksi	LT	248
F_su, ksi	L	163
F_su, ksi	LT	163
F_bru (e/D = 1.5), ksi	L	359
F_bru (e/D = 1.5), ksi	LT	359
F_bru (e/D = 2.0), ksi	L	487
F_bru (e/D = 2.0), ksi	LT	487
F_bry (e/D = 1.5), ksi	L	306
F_bry (e/D = 1.5), ksi	LT	306
F_bry (e/D = 2.0), ksi	L	389
F_bry (e/D = 2.0), ksi	LT	389
e, %	L	…
e, %	LT	4
ν		0.31
ρ, lb/in3		0.286

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
-300	118.6	118
-200	112.7	109.6
-100	107.7	105.3
0	103	101.8
100	98.8	99.3	98.4	99.2	99.8	99.1
200	94	95.8	92.5	94.9	97.2	95
300	90.4	92.6	88.4	90.8	94.9	92
400	87.6	89.3	85.4	86.4	92.4	88.9
500	86.4	86.3	83.2	82.2	89.6	86.2
600	85.4	83.3	81.7	78.4	86.8	83.5
700	83.4	79.9	79.4	76.5	83	79.6
800	78.9	77.1	75.8	76.1	77.4	74.2
1000	61.1	53.2

Factors in percent of the room-temperature allowable.

Other 280 Maraging Tables

280 Maraging-Maraged at 900 F Bar (Table 2.5.1.0(c))
280 Maraging-Maraged at 900 F Plate (Table 2.5.1.0(c))

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.