Table 2.5.1.0: (b). Design Mechanical and Physical Properties of 250 Maraging Steel

MIL-HDBK-5J, Metallic Materials and Elements for Aerospace Vehicle Structures

Last Updated 29 Oct 2026

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Specification	AMS 6520			AMS 6512
Form	Sheet	Plate		Bar
Condition	Maraged at 900°F			Maraged at 900°F
Thickness or diameter, in.	≤0.187	0.187-0.250	>0.250	<4.000	4.000-10.000
Basis	S	S	S	S	S
Mechanical Properties:
F_tu ksi:
L	247	252		255	245
T	255	255	255	255	245
F_ty ksi:
L	238	242		250	240
T	245	245	245	250	240
F_cy ksi:
L	221			260
T	225	255
F_su ksi	148	155		148
F_bru ksi:
(e/D = 1.5)	327	352
(e/D = 2.0)	444	448
F_bry ksi:
(e/D = 1.5)	278	324
(e/D = 2.0)	353	354
e, percent:
L	a_a	a_a	a_a	6	5
T	a_a	a_a	a_a	4	3
RA, percent:
L				45	30
T				35	20
E, 10³ ksi	26.5
E_c 10³ ksi:
L	28.2
T	29.4
G, 10³ ksi
μ	0.31
Physical Properties:
ω, lb/in.³	0.286
C, K, and α	See Figure 2.5.1.0

a Elongation properties vary with thickness as follows:
≤0.090	2.5%
0.091-0.125	3.0%
0.126-0.250	4.0%
0.251-0.375	5.0%
≥0.376	6.0%

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2.5.1.0 (c). Design Mechanical and Physical Properties of 280 Maraging Steel

Specification	AMS 6521^a			AMS 6514
Form	Sheet	Plate		Bar
Condition	Maraged at 900°F			Maraged at 900°F
Thickness or diameter, in.	≤0.187	0.188-0.250	>0.250	<4.000	4.000-10.000
Basis	S	S	S	S	S
Mechanical Properties:
F_tu, ksi:
L	271	276		280	275
T	280	280	280	280	275
F_ty, ksi:
L	262	267		270	270
T	270	270	270	270	270
F_cy, ksi:
L	244			281
T	248	281
F_su, ksi	163	170		162
F_bru, ksi:
(e/D = 1.5)	359	386
(e/D = 2.0)	487	492
F_bry, ksi:
(e/D = 1.5)	306	357
(e/D = 2.0)	389	390
e, percent:
L	'6'	'6'	'6'	5	4
T				4	2
RA, percent:
L				30	25
T				25	20
E, 10³ ksi	26.5
E_c, 10³ ksi:
L	28.6
T	29.6
G, 10³ ksi
μ	0.31
Physical Properties:
ω, lb/in.³	0.286
C, K, and α	See Figure 2.5.1.0

a	Noncurrent specification.
b	Elongation properties vary with thickness as follows:
≤0.090	2.5%
0.091-0.125	3.0%
0.126-0.250	4.0%
0.251-0.375	5.0%
≥0.376	6.0%

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