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

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Material class	Steel
Alloy / temper / form	250 Maraging / Maraged at 900 F / Sheet
Specifications	AMS 6520
Handbook	MIL-HDBK-5J, 31 January 2003, section 2.5.1.0, Table 2.5.1.0(b) (pdf page 94 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 6520
Basis		S
F_tu, ksi	L	247
F_tu, ksi	LT	255
F_ty, ksi	L	238
F_ty, ksi	LT	245
F_cy, ksi	L	221
F_cy, ksi	LT	225
F_su, ksi	L	148
F_su, ksi	LT	148
F_bru (e/D = 1.5), ksi	L	327
F_bru (e/D = 1.5), ksi	LT	327
F_bru (e/D = 2.0), ksi	L	444
F_bru (e/D = 2.0), ksi	LT	444
F_bry (e/D = 1.5), ksi	L	278
F_bry (e/D = 1.5), ksi	LT	278
F_bry (e/D = 2.0), ksi	L	353
F_bry (e/D = 2.0), ksi	LT	353
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 250 Maraging Tables

250 Maraging-Maraged at 900 F Bar (Table 2.5.1.0(b))
250 Maraging-Maraged at 900 F Plate (Table 2.5.1.0(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.