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N-155-Solution treated Tubing: MIL-HDBK-5J Design Allowables

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Material class	Heat-Resistant
Alloy / temper / form	N-155 / Solution treated / Tubing
Specifications	AMS 5585
Handbook	MIL-HDBK-5J, 31 January 2003, section 6.2.2.0, Table 6.2.2.0(b) (pdf page 16 of the chapter file)
Dimension bands	1
Density	0.3 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		all
Specification		AMS 5585
Basis		S
F_tu, ksi	L	100
F_ty, ksi	L	49
E, Msi		29.2
E_c, Msi		29.2
G, Msi		11.2
ρ, lb/in3		0.3

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

°F	F_tu	F_ty
100	98.1	97.1
200	92.3	89.7
300	88.3	83.8
400	86	78.6
500	84	74.4
600	83	70.4
700	81.8	67.1
800	80.6	63.8
1000		58
1200		53.4

Factors in percent of the room-temperature allowable.

Other N-155 Tables

N-155-Solution treated Sheet (Table 6.2.2.0(b))
N-155-Solution treated Strip and plate (Table 6.2.2.0(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from the chapter tables; check the printed table before use in a certified analysis, and note that MIL-HDBK-5J was superseded by MMPDS, whose later editions may differ.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.