A335 P91 Seamless Pipe

Product NameA335 P91 Seamless Pipe
MaterialAlloy Steel
SpecificationsASTM A335 / ASME SA335
Size Range1/2" NB to 24" NB
Wall ThicknessSCH 40, SCH 80, SCH 160, SCH XXS
LengthSingle Random, Double Random, or Custom Lengths
CertificationISO 9001, API 5L, CE
Categories: ,


Production Descriptions

The A335 P91 Seamless Pipe is a high-grade alloy steel pipe designed for demanding high-temperature applications. Compliant with ASTM A335 and ASME SA335 standards, it excels in boilers, heat exchangers, superheaters, and pressure vessels.


  • High-temperature services
  • Boilers
  • Heat exchangers
  • Superheaters
  • Pressure vessels

Chemical Composition A335 P91 Seamless Pipe

ElementComposition (%)
Carbon (C)0.08 - 0.12
Manganese (Mn)0.30 - 0.60
Silicon (Si)0.20 - 0.50
Phosphorus (P)0.020 max
Sulfur (S)0.010 max
Chromium (Cr)8.00 - 9.50
Molybdenum (Mo)0.85 - 1.05
Nickel (Ni)0.40 max
Aluminum (Al)0.02 max
Vanadium (V)0.18 - 0.25
Nitrogen (N)0.03 - 0.07

Mechanical Properties A335 P91 Seamless Pipe

Tensile Strength585 MPa (84,800 psi) min
Yield Strength415 MPa (60,200 psi) min
Elongation20% min
Hardness (Brinell)250 HB max
Hardness (Rockwell C)25 HRC max
Impact Energy (Charpy V-Notch)27 J (20 ft-lbf) min at 20°C (68°F)


A335 P91 Seamless Pipes offer superior strength and performance in high-temperature environments, making them ideal for critical industrial applications. Emirerri Steel delivers these pipes with a commitment to quality and reliability, meeting the diverse needs of our customers worldwide.


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