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Inconel X-750-Equalized and aged Bars and forgings: MIL-HDBK-5J Design Allowables

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Material class	Heat-Resistant
Alloy / temper / form	Inconel X-750 / Equalized and aged / Bars and forgings
Specifications	AMS 5667
Handbook	MIL-HDBK-5J, 31 January 2003, section 6.3.6.0, Table 6.3.6.0(b) (pdf page 78 of the chapter file)
Dimension bands	2
Density	8249 kg/m³

Design Mechanical and Physical Properties (room temperature)

Converted from the handbook table (ksi, Msi, lb/in³) and rounded to 4 significant figures; dimension bands in inches with mm in parentheses. 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		0–4 in (0–101.6 mm)	4–10 in (101.6–254 mm)
Specification		AMS 5667	AMS 5667
Basis		S	S
F_tu, MPa	L	1138	1103
F_ty, MPa	L	723.9	689.5
F_cy, MPa	L	723.9	689.5
F_su, MPa	L	703.3	682.6
F_bru (e/D = 1.5), MPa	L	1703	1655
F_bru (e/D = 2.0), MPa	L	2158	2096
F_bry (e/D = 1.5), MPa	L	1082	1034
F_bry (e/D = 2.0), MPa	L	1303	1241
e, %	L	20	15
E, GPa		211	211
E_c, GPa		211	211
G, GPa		81.36	81.36
ν		0.3	0.3
ρ, kg/m³		8249	8249

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

°C	F_tu	F_cy	F_su	F_bru	F_bry
38	99	98.9	98.9	99.3	99.3
93	96.7	97.9	95.6	97.4	99.1
149	94.7	95.9	92.9	95	98.5
204	92.7	93.9	90.8	92.4	98.1
26	91.5	90.7	90.7	90	97.7
316	90	89.9	88	87.5	97.1
371	89.5	88.8	84.6	84.3	96.6
427	89	86.9	80.4	80.7	96
538	87	80.7	68.4	73.6	89.7
649	74.6	71		63.6	76.4

Factors in percent of the room-temperature allowable.

Other Inconel X-750 Tables

Inconel X-750-Annealed and aged Plate (Table 6.3.6.0(b))
Inconel X-750-Annealed and aged Sheet (Table 6.3.6.0(b))
Inconel X-750-Annealed and aged Strip (Table 6.3.6.0(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.