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ASTM A335 is a ASTM standard specifies Seamless Ferritic Alloy Steel Pipe for High-Temperature Service. ASTM A335 pipe ordered to this specification shall be suitable for bending and similar forming operations, and for fusion welding. Selection will depend upon design, service conditions, mechanical properties, and high-temperature characteristics.
This specification covers seamless ferritic alloy-steel pipe for high-temperature service. The pipe shall be suitable for bending, flanging, and similar forming operations, and for fusion welding. The steel material shall conform to chemical composition, tensile property, and hardness requirements. Each length of pipe shall be subjected to the hydrostatic test. Also, each pipe shall be examined by a non-destructive examination method in accordance to the required practices. The range of pipe sizes that may be examined by each method shall be subjected to the limitations in the scope of the respective practices. The different mechanical test requirements for pipes, namely, transverse or longitudinal tension test, flattening test, and hardness or bend test are presented.
Mainly Grade of ASTM A335:
ASTM A335 P11, P22, P5, P9, P91, P92
Chemical Composition (%) for the main grade
Grade | C | Mn | P, S, max | Si | Cr | Mo |
P11 | 0.05-0.15 | 0.30-0.60 | 0.025 | 0.50-1.00 | 1.00-1.50 | 0.44-0.65 |
P22 | 0.05-0.15 | 0.30-0.60 | 0.025 | 0.50 max | 1.90-2.60 | 0.87-1.13 |
P5 | 0.15 max | 0.30-0.60 | 0.025 | 0.50 max | 4.00-6.00 | 0.45-0.65 |
P9 | 0.15 max | 0.30-0.60 | 0.025 | 0.25-1.00 | 8.00-10.00 | 0.90-1.10 |
P91 | 0.08-0.12 | 0.30-0.60 | 0.020/0.010 | 0.20-0.50 | 8.00-9.50 | 0.85-1.05 |
V 0.18-0.25 | N 0.03-0.07 | Ni 0.40 max | Al 0.02 max | Nb 0.06-0.10 | Ti 0.01 max | |
P92 | 0.07-0.13 | 0.30-0.60 | 0.020/0.010 | 0.50 max | 8.50-9.50 | 0.30-0.60 |
V 0.15-0.25 | N 0.03-0.07 | Ni 0.40 max | Al 0.02 max | Nb 0.04-0.09 | W 1.50-2.00 | |
B 0.001-0.006 | Ti 0.01 max | Zr 0.01 max |
Mechanical Properties
Grade P11, P22, P5, P9 | Grade P91 | Grade P92 | |
Tensile strength, min, (MPa) | 415 | 585 | 620 |
Yield strength, min, (MPa) | 205 | 415 | 440 |
Elongation, min, (%), L/T | 30/20 | 20/… | 20/… |
Heat Treatment | A / N+T | N+T / Q+T | N+T |
ASTM A572 High Strength Low Alloy Columbium and Vanadium Structure Pipe