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ASTM A335 Standard Seamless Alloy Steel Pipe

ASTM A335 Standard Seamless Alloy Steel Pipe

Standard: ASTM A335
Material: P1, P2, P5, P11, P12, P22, P91, and P92
OD range: 88.9~1422mm
WT range: 2.11~140mm

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Product Details

ASTM A335 Standard Seamless Alloy Steel Pipe

ASTM A335 is the standard specification for seamless ferritic alloy steel pipe for high temperature service. P5, P9, P11, P22, P91, and P92 are most widely utilized in practice. The specification covers nominal wall and minimum wall chrome-molybdenum ( also known as Cr-Mo, or Cr-Moly) alloy steel pipe intended for high-temperature application. Pipe ordered to this specification shall be suitable for bending, flanging (vanstoning), and similar forming operations, and for fusion welding. ASTM A335 P11, P22, P91 and P92 are commonly used in power plants and chemical-petrochemical industry, while P9 and P5 are mainly used in petroleum refineries. XOOS supplies ASTM A335 Cr-Mo alloy steel seamless pipes sized from 1/2″ to 54’’ ranging in wall thickness from SCH10 to 140mm.


1. Standards:
ASTM A335 Standard Specification for Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service


2. Application:
For the low and medium pressure boiler and steam header pipes;
For the high-pressure boiler and steam pipes, and the petrochemical industry pipes;
Power plant; Chemical Fertilizer; Petrochemicals; Offshore Oils; Gas Productions; Refineries and etc.


3. Ordering Information

Quantity (feet, meters, or number of lengths),

Name of material (seamless alloy steel pipe),

Grade (P1, P2, P5, P11, P12, P22, P91, and P92),

Manufacture (hot-finished or cold-drawn),

Size using one of the following:

NPS and schedule number;

Outside diameter and nominal wall thickness;

Outsider diameter and minimum wall thickness;

Inside diameter and nominal wall thickness;

Inside Diameter and minimum wall thickness.

Length (specific or random)

End finish (plain end or bevel end)


4. Chemical Requirements

Chemical Requirements



Composition, %
P12K115620.05-0.150.30-0.610.0250.0250.50 max0.80-1.250.44-0.65...
P22K215900.05-0.150.30-0.600.0250.0250.50 max1.90-2.600.87-1.13...
P91K915600.08-0.120.30-0.600.0200.0100.20-0.508.00-9.500.85-1.05V 0.18-0.25
N 0.030-0.070
Ni 0.40max
Al 0.02max
Cb 0.06-0.10
Ti 0.01 max
Zr 0.01max
P92K924600.07-0.130.30-0.600.0200.0100.50 max8.50-9.500.30-0.60V 0.15-0.25
N 0.03-0.07
Ni 0.40 max
Al 0.02 max
Cb 0.04-0.09
W 1.5-2.00
B 0.001-0.006
Ti 0.01 max
Zr 0.01 max


5. Available Size Range

88.9~14223''~ 56''2.11~140≥SCH10
*If the steel grades and size you are looking for are not listed above, please contact us for further information.


6. Tensile Requirements

Tensile Requirements
P1, P2P12P23P91P92, P911
P36 Class 1
P122P36 Class 2All others
Tensile Strength, min:
Yiled Strength, min:

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