ASTM A335 P91 Seamless Welded Steel Pipe

ASTM A335 P91 Seamless Welded Steel Pipe


ASTM A335 P91 Specification

Specialized inLarge Diameter Size
Outer Dimensions19.05mm – 114.3mm
Wall Thickness2.0mm – 14 mm
Lengthmax 16000mm
ScheduleSchedule 20 - Schedule XXS (heavier on request) up to 250 mm thk.
FormRound, Square, Rectangular, Hydraulic Etc.
StandardASTM A335 P91, SA335 P91 (with IBR Test Certificate)
Size1/2 NB to 36 NB
ScheduleSCH 40, SCH 80, SCH 160, SCH XS, SCH XXS, All Schedules
ToleranceCold drawn pipe: +/-0.1mm

Cold rolled pipe: +/-0.05mm
CraftCold rolled and Cold drawn
TypeSeamless / ERW / Welded / Fabricated
LengthSingle Random, Double Random & Cut Length.
EndPlain End, Beveled End, Treaded
Specialized inLarge Diameter SA335 P91 Material
Additional TestingNACE MR 0175, NACE TM0177, NACE TM0284, HIC TEST, SSC TEST, H2 SERVICE, IBR, etc.
ApplicationSeamless Ferritic Alloy-Steel Pipe for High-Temperature Service


ASTM A335 P91 Chemical Composition

C, %Mn, %P, %S, %Si, %Cr, %Mo, %V, %N, %Ni, %Al, %Nb, %
0.08-0.120.3-0.60.02 max0.01 max0.2-0.58.0-9.50.85-1.050.18-0.250.03-0.070.4 max0.04 max0.06-0.10
A335 P91 Material Composition and Astm A335 Gr P91 Composition is given in above table


ASTM A335 P91 Properties

Tensile Strength , MPaYield Strength, MPaElongation, %Hardness, HB
585 min415 min20 min250 max


ASTM A335 Gr P91 Equivalent Material

SA335 P91 Pipe equivalent

ASTMASMEEquivalent materialJIS G 3458UNS
A335 P91SA335 P91T91, K90901, X10CrMoVNb9-1, 1.4903K91560

Equivalent Standards: EN 10216-2, ASTM A213, ASME SA213, GOST 550-75, NBR 5603


ASTM A335 P91 Alloy Steel Seamless Pipes Heat Treatment Requirements

P5, P9, P11, and P22
GradeHeat Treatment TypeNormalizing Temperature Range F [C]Subcritical Annealing
or Tempering
Temperature Range F
ASTM A335 P5 (b,c) PipeFull or Isothermal Anneal
Normalize and Temper*****1250 [675]
Subcritical Anneal (P5c only)*****1325 - 1375 [715 - 745]
ASTM A335 P9 PipeFull or Isothermal Anneal
Normalize and Temper*****1250 [675]
ASTM A335 P11 PipeFull or Isothermal Anneal
Normalize and Temper*****1200 [650]
ASTM A335 P22 PipeFull or Isothermal Anneal
Normalize and Temper*****1250 [675]
ASTM A335 P91 PipeNormalize and Temper1900-1975 [1040 - 1080]1350-1470 [730 - 800]
Quench and Temper1900-1975 [1040 - 1080]1350-1470 [730 - 800]


A335 P91 Pipe Tensile Requirements

Tensile Strength, min., psi
Yield Strength, min., psi


More grades we can supply.

ASTM/ASME A/SA213 Gr. T2, T11, T12, T22, T91, T92
ASTM/ASME A/SA335 Gr. P1, P2, P5, P11, P12, P22
ASTM/ASME A/SA209 T1, T1a, T1b