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AISI 4130-Normalized and tempered, stress relieved Sheet, strip, plate, / bars, and forgings: MIL-HDBK-5J Design Allowables

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Material class	Steel
Alloy / temper / form	AISI 4130 / Normalized and tempered, stress relieved / Sheet, strip, plate, / bars, and forgings
Specifications	AMS 6350 / AMS 6528 / AMS-S-6758
Handbook	MIL-HDBK-5J, 31 January 2003, section 2.3.1.0, Table 2.3.1.0(g) (pdf page 24 of the chapter file)
Dimension bands	2
Density	0.283 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	0.000–0.188 in	0.188– in
Specification	AMS 6350 / AMS 6528 / AMS-S-6758	AMS 6350 / AMS 6528 / AMS-S-6758
Basis	S	S
F_tu, ksi	95	90
F_ty, ksi	75	70
F_cy, ksi	75	70
F_su, ksi	57	54
F_bru (e/D = 2.0), ksi	200	190
F_bry (e/D = 2.0), ksi	129	120
E, Msi	29	29
E_c, Msi	29	29
G, Msi	11	11
ν	0.32	0.32
n_t (Ramberg-Osgood)	8	…
n_c (Ramberg-Osgood)	10	…
ρ, lb/in3	0.283	0.283

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
-100	105.2	106.7
0	101.3	102.8
100	99.2	98.8	98.6	99.5	99.8	99.3
200	98.1	94.8	91.1	97.3	97.4	96.6
300	96.7	90.8	86.7	96.2	96.5	95.5
400	95.1	86.9	83.8	95.5	96.1	94.3
500	92.4	82.9	81.5	94.2	95.4	93.8
600	88.9	78.9	78.6	91.6	91.4	91.7
700	83.4	74.4	74	86.5	83.7	86.9
800	76.9	68.4	65.7	77.4	74.5	77.9
1000	58	42.6		56.2	54.2	56.9
1200	35.2	23.1		37.2

Factors in percent of the room-temperature allowable.

Stress-Strain Curves (Ramberg-Osgood)

ε = σ/E + 0.002 (σ/F_y)^n with the first band's S-basis yield strength and the exponent on file for it (the tension curve stops at F_tu).

Ramberg-Osgood design stress-strain curves at room temperature

Other AISI 4130 Tables

AISI 4130-Normalized and tempered, stress relieved Sheet, strip, plate, / and tubing (Table 2.3.1.0(c))
AISI 4130-Quenched and tempered Tubing (Table 2.3.1.0(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.