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ASTM A335 P9 Alloy Steel Seamless Tube For High Temperature Service
Overview
ASTM A335 P9 is a specific grade of seamless ferritic alloy-steel pipe that is commonly used for high-temperature service. It is designed to withstand elevated temperatures and provide excellent creep and stress rupture strength. The "P" in the designation indicates that it is a pressure vessel grade, and the number "9" represents its chromium content.ASTM A335 P9 offers good resistance to oxidation, corrosion, and high-temperature creep. It is commonly used in power generation, petrochemical, and refinery applications where high-temperature and high-pressure conditions are present.
Chemical Composition of ASTM A335 P9
| Grade | Mo | Cr | Si | Mn | C | P | S | |
| P9 | Min | 0.9 | 8.0 | 0.25 | 0.3 | |||
| Max | 1.1 | 10.0 | 1.00 | 0.6 | 0.15 | 0.025 | 0.025 |
Mechanical Properies of ASTM A335 P9
| Grade | Tensile Str Ksi(Mpa) | Yield Str Ksi(Mpa) | Elongation(%) |
| P9 | ≥60(415) | ≥30(205) | ≥30 |
Outside Diameter Tolerance of ASTM A335
| NPS(DN) Designator | Over | Under | ||
| in. | mm | in. | mm | |
| 1/8 to 1 1/2(6 to 40),incl. | 1/64(0.015) | 0.40 | 1/64(0.015) | 0.40 |
| Over 1 1/2 to 4(40 to 100),incl | 1//32(0.031) | 0.79 | 1/32(0.031) | 0.79 |
| Over 4 to 8(100 to 200),incl. | 1/16(0.062) | 1.59 | 1/32(0.031) | 0.79 |
| Over 8 to 12(200 to 300),incl. | 3/32(0.093) | 2.38 | 1/32(0.031) | 0.79 |
The Application of ASTM A335 P9
