ASTM A335 alloy seel pipe
This specification covers nominal wall and minimum wall seamless ferritic alloy-steel pipe intended for high-temperature service. ASTM A335 pipe ordered to this specification shall be suitable for fusion welding, bending, flanging, and similar forming operations.
Chemical Composition of ASTM A335 Alloy Pipe
| ASTM A335 | Grade | P-5 | P-9 | P-11 | P-22 | P-91 |
| Element | UNS Designation | K41545 | S50400 | K11597 | K21590 | K91560 |
| Carbon | 0.15 max | 0.15 max | 0.05 – 0.15 | 0.05 – 0.15 | 0.08 – 0.12 | V at 0.18 – 0.25 |
| Manganese | 0.30 – 0.60 | 0.30 – 0.60 | 0.30 – 0.60 | 0.30 – 0.60 | 0.30 – 0.60 | N at 0.030 – 0.070 |
| Phosphorous, max | 0.025 | 0.025 | 0.025 | 0.025 | 0.020 | Ni at 0.40 max |
| Sulfur, max | 0.025 | 0.025 | 0.025 | 0.025 | 0.010 | Al at 0.02 max |
| Silicon | 0.50 max | 0.25 – 1.00 | 0.50 – 1.00 | 0.50 max | 0.20 -0.50 | Cb at 0.06 – 0.10 |
| Chromium | 4.00 – 6.00 | 8.00 – 10.00 | 1.00 – 1.50 | 1.90 – 2.60 | 8.00 – 9.50 | Ti at 0.01 max |
| Molybdenum | 0.45 -0.65 | 0.90 – 1.10 | 0.44 – 0.65 | 0.87 – 1.13 | 0.85 – 1.05 | Zr at 0.01 max |
Mechanical Properties of ASTM A335 Alloy Pipe
| ASTM A335 | P-5 | P-9 | P-11 | P-22 | P-91 |
| Tensile Strength, min., psi | |||||
| ksi | 60 | 60 | 60 | 60 | 85 |
| MPa | 415 | 415 | 415 | 415 | 585 |
| Yield Strength, min., psi | |||||
| ksi | 30 | 30 | 30 | 30 | 60 |
| MPa | 205 | 205 | 205 | 205 | 415 |
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Calculated Minimum Elongation Values of ASTM A335 Pipe-Elongation in 2 in. or 50 mm, min %
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| Wall Thickness | P5, P9, P11, P22 | P91 | ||
| in. | mm | Longitudinal | Transverse | Longitudinal |
| 5/16 (0.312) | 8 | 30 | 20 | 20 |
| 9/32 (0.281) | 7.2 | 28 | 19 | 19 |
| 1/4 (0.250) | 6.4 | 27 | 18 | 18 |
| 7/32 (0.219) | 5.6 | 26 | - | 17 |
| 3/16 (0.188) | 4.8 | 24 | - | 16 |
| 5/32 (0.156) | 4 | 22 | - | 15 |
| 7/8 (0.125) | 3.2 | 21 | - | 14 |
| 3/32 (0.094) | 2.4 | 20 | - | 13 |
| 1/18 (0.062) | 1.6 | 18 | - | 12 |
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