Table 2.4.3.0: (a). Material Specifications for · MIL-HDBK-5J

9Ni-4Co-0.30C Steel

Specification	Form
AMS 6524^a	Sheet, strip, and plate
AMS 6526	Bar, forging, and tubing

a Noncurrent specification.

2.4.3.1 Heat-Treated Condition — Effect of temperature on various mechanical properties is presented in Figures 2.4.3.1.1. through 2.4.3.1.4. Typical stress-strain and tangent-modulus curves are presented in Figures 2.4.3.1.6(a) through (d). Notched fatigue data at room temperature are illustrated in Figure 2.4.3.1.8.

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2.4.3.0 (b). Design Mechanical and Physical Properties of 9Ni-4Co-0.30C Steel

Specification	AMS 6524^a		AMS 6526
Form	Sheet, strip, and plate		Bar, forging, and tubing
Condition	Quenched and tempered		Quenched and tempered
Thickness, in.	≤0.249	≥0.250	<4.000
Basis	S^b	S^b	S^b
Mechanical Properties:
F_tu, ksi:
L			220
LT	220	220
F_ty, ksi:
L			190
LT	185	190
F_cy, ksi:
L			209
LT		209
F_su, ksi		137	137
F_bru^c, ksi:
(e/D = 1.5)		346	346
(e/D = 2.0)		440	440
F_bry, ksi:
(e/D = 1.5)		291	291
(e/D = 2.0)		322	322
e, percent:
L			10
LT	6	10
RA, percent:
L			40
LT		35
E, 10³ ksi	28.5
E_c, 10³ ksi	29.8
G, 10³ ksi
μ
Physical Properties:
ω, lb/in.³	0.28
C, Btu/(lb)(°F)
K, Btu/[(hr)(ft²)(°F)/ft]	13.3 (75°F)
α, 10^-6 in./in./°F	See Figure 2.4.3.0