Table 6-1.Corrosion-Resistant Steel Tubing
Specification
Tubing Material
Type
Condition
General Usage and Applications
MIL-T-7081
6061
A1
Specification covers annealed and three heat
treated tempers used mostly in 0-annealed and
T-6. Has good workability. The 6061-T6 is used
in hydraulic/pneumatic 3000 psi systems.
MIL-T-8506
304
Annealed
Low-pressure applications such as fuel lines.
18-8
Unsatisfactory for high-pressure hydraulic lines.
Corrosion-Resistant
Has high degree of resistance to corrosion.
Steel
(CRES)
MIL-T-8504
304
Annealed
Unsatisfactory for welding, brazing or exposure
18-8
to temperatures higher than 800°F. Used in
CRES
high-pressure hydraulic/pneumatic systems.
MIL-T-8606
304L
Annealed
Hydraulic/mechanical applications. Has high
18-8
(low carbon)
resistance to corrosion and high temperatures up
CRES
321
to 1500°F. Suitable for applications requiring
347
welding/brazing. Type II intended for
high-pressure hydraulic applications, using
brazed sleeve joints.
MIL-T-6845
304
1/8H
Used in high-pressure hydraulic/pneumatic
18-8
systems. Unsuitable for welding/brazing
CRES
applications or exposure to temperatures above
800°F.
MIL-T-8973
304L
1/8H
Used in high-pressure hydraulic/pneumatic
18-8
(low carbon)
systems assembled with brazed sleeve joints.
CRES
316L
Suitable for use in moderately corrosive or
(low carbon)
oxidizing environments, temperatures to 1200°F.
321
Weldable.
347
MIL-T-5695
304
1/4H
Used for aircraft structural parts or similar
18-8
1/2H
applications not requiring sharp bends or flaring.
CRES
Unsatisfactory for welding other than resistance
weld.
MIL-T-8808
321
Annealed
Aircraft hydraulic quality, used in high-pressure
18-8
347
hydraulic/pneumatic systems. Most often used in
CRES
these systems requiring brazing/welding.
6-2