MIL-T-85048
3.3 Performance
3.3.1 Flarability. Tubing 0.125 inch outside diameter, and over, shall flare to the respective dimensions of MS33584, when tested as specified in 4.3.6. The flared zones shall be uniform and smooth, and capable of forming pressure-tight joints with standard fittings.
3.3.2 Flattening. Tubing shall not develop cracks, tears, or other flaws when subjected to the flattening test specified in 4.3.7.
3.3.3 Bending. Tubing shall not develop cracks tears, breaks, or other flaws when subjected to the bending test specified in 4.3.8.
3.4 Corrosion resistance
3.4.1 Resistance to acidified copper-sulfate solution. The tubing shall exhibit no evidence of cracks due to intergranular attack when subjected to the examination after exposure to boiling acidified copper-sulfate solution at the conditions specified in method E of ASTM A 262 and 4.3.9.
3.4.2 Passivation treatment. Treatment of inner and outer surfaces by other than picking shall be followed by a passivation treatment in accordance with QQ-P-35. The surfaces shall be passive to tests as specified in 4.3.10.
3.5 Surface conditions. Surface shall be smooth, have a grey metallic appearance and be free from surface films, scale, flakes, or loose or adherent particles of foreign matter. All chemical bath residues shall have been removed by rinsing in flowing water,
followed by thorough drying. Compliance shall be determined as specified in 4.3.2.3.
3.5.1 Surface roughness. Surface roughness shall not exceed an arithmetical average roughness height rating (RHR) of 70 on inside surfaces or RHR 40 on outside surfaces, as defined by ANSl B 46.1. The maximum depth of individual surface discontinuities shall not exceed the limits of table lll.
TABLE lll. Limits of depth of discontinuities.
Nominal wall thickness (inch) |
Maximum permissible depth of discontinuities (inch) |
0.020 and under 0.021 through 0.030 0.031 through 0.040 0.041 through 0.050 0.051 through 0.066 0.067 through 0.085 |
10 percent of nominal wall thickness 0.002 0.0025 0.003 0.004 0.006 |
3.5.2 Discontinuities. Discontinuities of equal or less depth in the outer surfaces of tubes shall be removed by light belt polishing or buffing; except that discontinuities having large root radii plainly visible to the unaided eye, whose surfaces blend smoothly into the normal tube surface, need not be removed. Passivation treatment shall follow any surface polishing or buffing operation.
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