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ASTM A335 P91 Alloy Steel Pipe

ASTM A335 P91 is a standard specification for seamless ferritic alloy-steel pipes designed for high-temperature service.

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ASTM A335 P91 is a standard specification for seamless ferritic alloy-steel pipes designed for high-temperature service. P91 is a chromium-molybdenum alloy steel with added vanadium and niobium, which provides excellent high-temperature strength, oxidation resistance, and creep resistance. It is widely used in power plants, petrochemical industries, and other high-temperature applications.

 

ASTM A335 Alloy Steel Pipe Size & Grades

 

Processing Method: Seamless and Welded
Size Range 1/8” – 48” / DN6 – 1200
Thickness Schedule SCH 20- SCH 160, XXS
Length 6m or 12 m or Random
Standard ASME B36.10
Surface Treatment Blasting and Painting, Epoxy Powder FBE, 2PE, 3PE Coating
Material Grade ASTM A335 P11 / P12 / P 5 / P9 / P91 / P92, A213 T11 / T12 / T22 / T5 / T9 / T91 / T92. 15CrMoG, 12Cr1MoVG, 12Cr5Mo, 1Cr5Mo, Cr9Mo, 10CrMo910, 12CrMo4-5

 

P91 Alloy Steel Pipe Chemical Composition

 

CHEMICAL LIMITS C Mn P S Si Cr Mo V N Ni Al Nb Ti Zr Sn Sb As B W Cu
TYPE 1 MIN 0.08 0.30 0.20 8.0 0.85 0.18 0.03 0.06
MAX 0.12 0.60 0.020 0.010 0.50 9.5 1.05 0.25 0.07 0.40 0.02 0.10 0.01 0.01
TYPE 2 MIN 0.07 0.30 0.20 8.0 0.80 0.16 0.035 0.05
MAX 0.13 0.50 0.020 0.005 0.40 9.5 1.05 0.27 0.070 0.20 0.02 0.11 0.01 0.01 0.01 0.003 0.010 0.001 0.050 0.10

 

Tensile Requirements of P91 Alloy Steel Pipes

 

P-91
Tensile Strength, min., psi
ksi 85
MPa 585
Yield Strength, min., psi
ksi 60
MPa 415

Applications of ASTM A335 P91 Pipes

 

Power Generation:

High-temperature steam lines in power plants.

Boiler tubes and superheater tubes.

Petrochemical Industry:

High-temperature and high-pressure pipelines.

Oil and Gas:

Pipelines and equipment exposed to high temperatures and corrosive environments.

 

Advantages of P91 Alloy Steel

 

High strength at elevated temperatures.

Excellent resistance to oxidation and corrosion.

Good weldability and formability (with proper preheating and post-weld heat treatment).

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