ASTM A335 / ASME SA-335 P22 Pipe Specifications

The table below summarises the key specifications of this chrome-moly pipe. P22 pipe is a seamless ferritic alloy-steel pipe specification for high-temperature service, containing 2.25% chromium and 1% molybdenum. It is manufactured per ASTM A335 / ASME SA-335 and dimensioned to ASME B36.10.

Specification Details
Standard ASTM A335 / ASME SA-335
Type Seamless Pipe
Material Ferritic Alloy Steel (2.25Cr-1Mo)
Outer Diameter 1/2" NB to 24" NB (19.05 mm to 610 mm)
Wall Thickness SCH 20, SCH 40, SCH 60, SCH 80, SCH 160, XXS
Length Single Random, Double Random, Cut-to-Length (max 16,000 mm)
End Type Plain End (PE), Beveled End (BE)
Surface Finish Black and Anti-corrosion Oil
Dimensional Standard ASME B36.10

ASTM A335 P22 Pipe Dimensions and Sizes

ASTM A335 P22 seamless pipe comes in many diameters, wall thicknesses, and lengths to suit different high‑temperature power and process piping needs.

Parameter Details
Outer Diameter (NB) 1/2" to 24" (19.05 mm to 610 mm)
Wall Thickness SCH 20 to XXS
Single Random Length 5 to 7 metres
Double Random Length 9 to 13 metres
Cut-to-Length Up to 16,000 mm

P22 Pipe Schedule Chart

The schedule chart below shows nominal pipe size, outer diameter and wall thickness for commonly ordered ASTM A335 P22 pipe schedules.

NPS (inches) OD (mm) SCH 40 WT (mm) SCH 80 WT (mm) SCH 160 WT (mm)
1/2" 21.3 2.77 3.73 4.75
1" 33.4 3.38 4.55 6.35
2" 60.3 3.91 5.54 8.74
4" 114.3 6.02 8.56 13.49
6" 168.3 7.11 10.97 18.26
8" 219.1 8.18 12.70 23.01
10" 273.1 9.27 15.09 28.58
12" 323.8 10.31 17.48 33.32
16" 406.4 12.70 21.44 36.53
24" 610.0 17.48 30.96 59.54

ASTM A335 P22 Pipe Price

P22 alloy pipe prices in India usually start at about ₹350 per kg for standard seamless sizes. Heavier schedules and larger diameters cost more. Internationally, the price range for this product usually falls between $1.20 to $9.00 per kg.

The final price depends on pipe size, wall thickness, order quantity, and alloy surcharges for chromium and molybdenum. Extra requirements such as third-party inspection, special coatings, or urgent delivery can further increase the cost. Bulk orders of 5 metric tons or more usually receive more competitive rates.

Chemical Composition of ASTM A335 P22 Pipe

The chemical composition of ASTM A335 / ASME SA-335 P22 pipe is defined in the table below, with chromium and molybdenum as the primary alloying additions for high-temperature performance.

Carbon is kept between 0.05 and 0.15% to maintain weldability while providing sufficient hardness for pressure service.

Carbon C
0.05 to 0.15%
Manganese Mn
0.30 to 0.60%
Phosphorus P
0.025% max
Sulfur S
0.025% max
Silicon Si
0.50% max
Chromium Cr
1.90 to 2.60%
Molybdenum Mo
0.87 to 1.13%

Mechanical Properties of ASTM A335 P22 Pipe

These values apply to the normalised and tempered delivery condition for ASTM A335 P22 pipe.

Maximum hardness of 250 HBW confirms that the material retains enough ductility for field fabrication and bending operations.

415/60
MPa (ksi)
Tensile Strength (min)
205/30
MPa (ksi)
Yield Strength (min)
30
%
Elongation (min)
250
HBW
Maximum Hardness
Property Value
Tensile Strength (min) 415 MPa (60 ksi)
Yield Strength (min) 205 MPa (30 ksi)
Elongation (min) 30%
Hardness (max) 250 HBW
Request a Quote for ASTM A335 P22 Pipe Request a Quote

Equivalent Designations for ASTM A335 P22 Pipe

The table below lists the most common equivalents by region. ASTM A335 P22 pipe is equivalent to several international standard designations.

Standard Designation
UNS K21590
EN 10216-2 10CrMo9-10 (W.Nr. 1.7380)
JIS G3458 STPA 24
GB 5310 12Cr2MoG

Available Forms of ASTM A335 P22 Pipe

ASTM A335 P22 is mainly supplied as seamless pipe made by hot rolling or cold drawing. It comes with plain (PE) or bevelled (BE) ends for welding.

  • Seamless hot-rolled P22 pipe
  • Seamless cold-drawn P22 pipe
  • Schedule-specific variants

Applications of ASTM A335 P22 Pipe

ASTM A335 P22 pipe is used in high-temperature, high-pressure piping systems across three primary industries. Its 2.25Cr-1Mo composition lets it safely handle temperatures up to about 600°C.

Power Generation

P22 alloy steel pipe is widely used in power plants for boiler tubes, steam headers, and high-pressure lines, offering strong long-term performance under repeated high-temperature and pressure cycles.

Oil, Gas, and Petrochemical

Refineries and petrochemical plants use P22 pipe in catalytic reformer units, hydrocracker circuits and high-temperature hydrogen services. Heat exchangers and transfer lines are common applications where P22 pipe replaces lower carbon steel.

Chemical Processing

This grade finds use in chemical plants handling high-temperature synthesis gas, ammonia converters and methanol reactors. P22 chrome-moly pipe tolerates the combined effects of thermal stress and mildly corrosive chemical environments.

ASTM A335 P22 Pipe Comparison: P22 vs P11 vs P91

The following comparison table highlights the main differences between P22, P11, and P91 materials.

Property P11 (1.25Cr-0.5Mo) P22 (2.25Cr-1Mo) P91 (9Cr-1Mo-V)
Chromium Content 1.00 to 1.50% 1.90 to 2.60% 8.00 to 9.50%
Molybdenum Content 0.44 to 0.65% 0.87 to 1.13% 0.85 to 1.05%
Tensile Strength (min) 415 MPa 415 MPa 585 MPa
Yield Strength (min) 205 MPa 205 MPa 415 MPa
Max Service Temp (approx.) 540°C 590 to 600°C 650°C
PWHT Temperature 675 to 730°C 690 to 745°C 730 to 770°C

P22 (2.25Cr-1Mo) is intended for higher operating temperatures than P11 but lower than P91, with continuous use up to about 590-600°C. This makes it an intermediate choice between the two grades and well-suited for high‑temperature piping.

Shipping & Packaging

Main export packaging setup Heavy-duty wooden boxes Packing
Export Packaging Standard

We strictly follow seaworthy export handling standards to protect ASTM A335 P22 Pipe from transit damage, moisture ingress, and surface contamination during long-distance dispatch.

  • Heavy-duty wooden boxes with moisture barrier lining
  • HDPE stretch film wrapping on all bundles
  • Plastic end caps on threaded and plain-end pipes
  • Silica gel desiccants to minimize moisture exposure
  • ISPM-15 fumigated wooden packaging for export
shipping preparation Pipe Bundle Yard Staging
Shipping packaging Container End-Cap Protection
Shipping stock Wrapped Export-Ready Bundles

We Export Worldwide

Sachiya Steel International supplies Alloy steel products to major industrial markets across North America, Europe, the Middle East, Asia and Africa with export-ready documentation and logistics support.

  • USA flagUSA
  • Canada flagCanada

Frequently Asked Questions

What is ASTM A335 P22 Pipe material?+
ASTM A335 P22 is a seamless ferritic alloy steel pipe for high-temperature use. It has 2.25% chromium and 1% molybdenum, giving it good oxidation resistance and creep strength up to about 590-600°C.
What is the equivalent of ASTM A335 grade P22?+
The equivalent of ASTM A335 Grade P22 is EN 10216-2 10CrMo9-10 (W.Nr. 1.7380) in European standards, JIS G3458 STPA 24 in Japanese standards, and GB 5310 12Cr2MoG in Chinese standards. The ASME designation is SA-335 P22.
What is the difference between ASTM A335 P11 and P22 Pipe?+
The difference between ASTM A335 P11 and P22 pipe is the chromium content. P11 contains 1.00 to 1.50% chromium (1.25Cr-0.5Mo), while P22 contains 1.90 to 2.60% chromium (2.25Cr-1Mo). P22 handles higher service temperatures, up to 590 to 600°C, compared with P11's limit of approximately 540°C.
What is the maximum service temperature for ASTM A335 P22 Pipe?+
The maximum service temperature for ASTM A335 P22 pipe is approximately 590 to 600°C (1094 to 1112°F) for continuous operation. Above this range, creep deformation rates accelerate.
What is the difference between P22 and P91 Pipe?+
P91 pipe contains 8.00 to 9.50% chromium with vanadium and niobium additions, compared with P22's 1.90 to 2.60% chromium. P91 has a minimum tensile strength of 585 MPa (versus 415 MPa for P22) and serves temperatures up to approximately 650°C. P22 is limited to 590 to 600°C.
What welding procedure is recommended for P22 Pipe?+
For P22 pipe welding, preheat to 200-300°C, use low-hydrogen filler metals, and perform PWHT at 690–745°C for at least 1 hour per 25 mm thickness. Control heating and cooling to avoid thermal shock and cracking.
What sizes are available for ASTM A335 P22 Pipe?+
ASTM A335 P22 pipe comes in 1/2" to 24" diameters, wall thicknesses from SCH 20 to XXS, and lengths up to 16,000 mm. Sachiya Steel International stocks standard sizes and can provide custom dimensions on request.
What is the typical hardness of ASTM A335 P22 Pipe?+
The typical hardness of ASTM A335 P22 pipe does not exceed 250 HBW in the normalised and tempered condition, per ASTM A335 requirements. This maximum hardness limit confirms that the pipe retains sufficient ductility.

Contact Us for Stock Availability Request a Quote