MIL-T-85048
3.1.1 Chemical composition. The chemical composition shall be as specified in table I.
TABLE I. Chemical composition of the tubing.
Element Limits Check analysis tolerance 1/ (percent) (under min. or over max.) |
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Carbon Manganese Phosphorus Sulfur Silicon Chromium Nickel Molybdenum Copper |
0.08 (max) 2.00 (max) 0.04 (max) 0.030 (max) 1.00 (max) 18.00 - 20.00 8.00 - 12.00 0.50 (max) 0.75 (max) |
-- -- -- -- -- 0.20 0.10 -- -- |
0.01 0.04 0.005 0.005 0.05 0.20 0.15 0.03 0.03 |
1/ Individual determination may vary from the specified range to the extent shown in the check analysis column, except that elements in any heat shall not vary both above and below the specified range. |
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3.1.2 Grain size. The grain size of the steel in the as-received condition shall be predominantly no. 5 or finer, in accordance with ASTM E 112.
3.2 Mechanical properties. The mechanical properties shall be as specified in table II.
TABLE II. Mechanical properties of tubing.
Nominal outside diameter (inch) |
Nominal wall thickness (inch) |
Ultimate tensile strength (psi) (psi) |
Yield strength 0.2 percent offset (min) Full |
Elongation in 2 inches (min) percent |
|
section |
strip |
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|
0.187 and less |
0.016 and less Over 0.016 |
115,000 (max) 75,000 - 100,000 |
30,000 30,000 |
35 40 |
35 35 |
Over 0.187 to 0.500, incl. |
0.012 and less Over 0.012 |
110,000 (max) 75,000 - 100,000 |
30,000 30,000 |
37 40 |
37 35 |
Over 0.500 |
All |
75,000 - 100,000 |
30,000 |
40 |
35 |
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