MIL-DTL-22606D(SH)
TABLE II. Minimum mechanical properties, flasks, skirts, and bearing blocks.
Flasks 1/
ASTM A336/A336M
Skirts
Bearing blocks
Mechanical property
Grade F22
HY-80/100 IAW
ASTM A572/A572M
ASTM A335/A335M
T9074-BD-GIB-010/300
Grade P22
90,000 (min)
90,000 (min)
Yield strength at 0.2%
42,000 (min)
130,000 (max)
130,000 (max)
offset (psi)
Tensile strength (psi)
110,000 (min)
63,000 (min)
110,000 (min)
Elongation in 2 inches (%)
15 (min)
21 (min)
15 (min)
Brinell hardness (BHN)
229 (min)
-
-
Charpy V-notch at -70 °F
35 (min)
-
35 (min)
(foot-pounds)
NOTE:
1/
For Class 5500 flasks, yield strength at 0.2% offset shall be 98,400 psi (min) and tensile strength shall be
120,000 psi (min). All other flask mechanical properties shall be as specified.
3.1.4 End plugs. Unless otherwise specified (see 6.2), end plugs (see figures 3, 4, 5, and 6) for Service A and
Service C flasks shall be fabricated from bar stock or forged from material conforming to ASTM A322 Grade 4130.
If bar stock is used, a minimum reduction ratio of 3-to-1 from solidified cross-sectional area to bar cross-sectional
area shall be provided. End plugs shall be heat-treated to achieve the properties specified in table III when tested as
specified in 4.3.2.1.
3.1.4.1 Oxygen and special flask plugs. Inlet/outlet plugs and drain plugs for Service B flasks shall be hot
finished nickel-copper in accordance with the chemistry of QQ-N-281, Class A, and shall have mechanical
properties specified in table III. Material chemistry shall be verified by testing as specified in 4.3.1 and mechanical
properties verified by testing as specified in 4.3.2.1.
TABLE III. Mechanical properties, end plugs.
ASTM A322
QQ-N-281 Class A
Mechanical properties
Grade 4130
hot finished
Yield strength at 0.2% offset (psi) (min)
55,000
30,000
Tensile strength (psi) (min)
85,000
75,000
Elongation in 2 inches (%) (min)
15
26
3.1.5 O-rings and back-up rings. O-rings shall be made of fluorocarbon rubber in accordance with
SAE-AMS7259. O-rings more than 36 months old at time of initial flask shipment from the manufacturing facility
shall not be used. Back-up rings shall be made of virgin polytetrafluoroethylene (PTFE).
3.1.6 Inerting caps. Inerting caps shall be constructed of material capable of withstanding a minimum pressure
of 100 pound-force per square inch gauge (psig). All surfaces shall be corrosion resistant.
3.1.7 Oil. Oils used in the production process during fabrication shall be of the type that will fluoresce under
the ultraviolet light examination specified in 4.2.3.
8
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