Tools › Materials › Steel › AISI 8630-Quenched and tempered Bars and forgings

AISI 8630-Quenched and tempered Bars and forgings: MIL-HDBK-5J Design Allowables

show US units (ksi, Msi, lb/in³) open the MIL-HDBK-5J tool compare against temperature find alternatives

Material class	Steel
Alloy / temper / form	AISI 8630 / Quenched and tempered / Bars and forgings
Specifications	AMS-S-6050
Handbook	MIL-HDBK-5J, 31 January 2003, section 2.3.1.0, Table 2.3.1.0(c) (pdf page 19 of the chapter file)
Dimension bands	1
Density	7833 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		0.000–1.500 in (0–38.1 mm)
Specification		AMS-S-6050
Basis		S
F_tu, MPa		861.8
F_ty, MPa		689.5
F_cy, MPa		751.5
F_su, MPa		517.1
F_bru (e/D = 1.5), MPa		1338
F_bru (e/D = 2.0), MPa		1731
F_bry (e/D = 1.5), MPa		1007
F_bry (e/D = 2.0), MPa		1207
E, GPa		199.9
E_c, GPa		199.9
G, GPa		75.84
ν		0.32
ρ, kg/m³		7833

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_ty	F_cy	F_su	F_bru	F_bry
-73	105.2	106.7
-18	101.3	102.8
38	99.2	98.8	98.6	99.5	99.8	99.3
93	98.1	94.8	91.1	97.3	97.4	96.6
149	96.7	90.8	86.7	96.2	96.5	95.5
204	95.1	86.9	83.8	95.5	96.1	94.3
26	92.4	82.9	81.5	94.2	95.4	93.8
316	88.9	78.9	78.6	91.6	91.4	91.7
371	83.4	74.4	74	86.5	83.7	86.9
427	76.9	68.4	65.7	77.4	74.5	77.9
538	58	42.6		56.2	54.2	56.9
649	35.2	23.1		37.2

Factors in percent of the room-temperature allowable.

Other AISI 8630 Tables

AISI 8630-Normalized and tempered, stress relieved Tubing (Table 2.3.1.0(g))
AISI 8630-Normalized and tempered, stress relieved (90 ksi) Sheet, strip, and plate (Table 2.3.1.0(c))
AISI 8630-Normalized and tempered, stress relieved (95 ksi) Sheet, strip, and plate (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.