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ASTM A335 Grade P91 Alloy Steel Seamless Pipe

The ASTM A335 P91 Pipe is a special alloy steel grade that can be used for high temperature application, especially those involving power plants, energy & power plants and mechanical engineering. The chemistry of ASTM A335 P91 Alloy Steel Pipe contains about 9 % Chromium and 1 % Molybdenum not forgetting to include the trace quantities of Nickel and Manganese in its alloy. The addition of Chromium in the P91 Seamless Pipe is what improves the high temperature strength of the alloy along with increasing its oxidation resistance properties. While the content of Molybdenum added in the alloy of A335 P91 Welded Pipe increases its resistance to creep.

ASTM A335 Grade P91 Alloy Steel Seamless Pipe

Not discounting the increased hardenability witnessed in the A335 P91 Material due to the addition of nickel as well as manganese content. The ASTM A335 is a specification which takes into consideration seamless constructed ferritic alloy steel pipe such as the P91 Steel Pipe intended to be used for high temperature applications. Per the specification, this ASTM specified SA335 Grade P91 pipe not only conforms to the chemistry but also the tensile property, and hardness requirements. As one of the popular P91 Pipe suppliers in India, we offer reasonably priced, good quality products.

Material Specification of ASTM A335 Grade P91 Pipe

Type Seamless / ERW / Welded / Fabricated
Standard ASTM A335 P91, SA335 P91 (with IBR Test Certificate)
Size 1/2” NB to 36” NB
Length Standard
Double &
In Cut length also.
Schedules SCH 80, SCH 40, SCH XS, SCH 160, SCH XXS, All Schedules
Tolerance Cold drawn pipe: +/-0.1mm
Cold rolled pipe: +/-0.05mm
End Plain End, Beveled End, Treaded
Craft Cold rolled and Cold drawn
available in Form of Square, Round, Hydraulic, Rectangular Etc.
Specialized in Large Diameter ASTM A335 P91 Pipe
Additional Testing HIC TEST, NACE MR 0175, H2 SERVICE, NACE TM0284, NACE TM0177, SSC TEST, IBR, etc.
Thickness 3-12mm

How To Check P91 Pipe?

A335 P91 is a mixture of 9 % Chromium and 1 % Molybdenum, it is major material used in power plants. Molybdenum increases the creep resistance of SA335 P91. It is formed by normalizing at 1050 °C, air cooling down to 200 °C.

Size Chart of SA335 Gr P91 Pipe

O.D.(mm) x Thickness(mm) O.D(mm) x Thickness(mm) O.D(mm) x Thickness(mm)
38.1 x 3.2 57.0 x 4.9 76.2 x 4.0
38.1 x 4.0 57.0 x 6.3 76.2 x 5.0
38.1 x 6.3 57.0 x 7.9 76.2 x 6.3
42.4 x 3.2 60.3 x 3.2 82.5 x 4.5
42.4 x 4.0 60.3 x 3.6 88.9 x 3.2
44.5 x 3.2 60.3 x 5.0 88.9 x 3.6
44.5 x 6.3 63.5 x 3.2 88.9 x 4.0
48.3 x 3.2 63.5 x 3.6 101.6 x 3.6
48.3 x 3.6 63.5 x 4.0 101.6 x 4.5
50.8 x 4.5 63.5 x 6.3 101.6 x 6.3
51.0 x 3.2 63.5 x 7.9 114.3 x 3.6
51.0 x 3.6 70.0 x 3.2 114.3 x 5.0
51.0 x 6.3 70.0 x 3.6 139.7 x 4.0
57.0 x 3.2 70.0 x 6.3 139.7 x 5.0
57.0 x 3.6 76.2 x 3.6 139.7 x 6.3

Chemical Compatibility of A335 P91 Welded Pipe

Alloy Steel P91 Carbon Chromium Manganese Molybdenum Phosphorus Sulphur Silicon
0.08-0.12 8.00 – 9.50 0.30-0.60 0.85 – 1.05 0.020 max 0.010 max 0.20 -0.50

P91 Alloy Steel Seamless Pipe Mechanical Strength

Tensile Strength, MPa Yield Strength, MPa Elongation
585 min 415 min 20 min

Material Equivalent of ASTM A335 P91 Pipe

ASTM ASME Equivalent material JIS G 3458 UNS BS DIN ISO ABS NK LRS
A335 P91 SA335 P91 T91, K90901, X10CrMoVNb9-1, 1.4903 K91560
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