A335 P22 Seamless Pipe

QS Steel Pipe: Xiamen A335 P22 Seamless Pipe

ASTM A335 P22 seamless alloy pipe in 2.25Cr-1Mo steel, 1/2 to 24 inch SCH40 to XXS, for refinery and process lines needing Cr-Mo performance.

Quantity

Contact Now

add to cart

One-Minute Overview

A335 P22 seamless alloy pipe in 2.25Cr-1Mo steel for process service.
1/2 to 24 inch with walls from SCH40 to XXS to ASTM A335.
Seamless tube with controlled dimensions for clean fit-up in the field.
Ordered for refinery and process lines that step beyond carbon steel.

A335 P22 seamless pipe is the 2.25Cr-1Mo alloy tube in the ASTM A335 family, chosen when a line needs more strength and oxidation resistance than carbon steel gives. This page covers the standard seamless product, 1/2 to 24 inch with walls from SCH40 to XXS, dimensioned to ASME B36.10M and prepared to the end style the job calls for. What matters on site is consistency: outside diameter and wall within tolerance, bevels to the joint design, and certification tied to each heat.

Name: A335 P22 Seamless Pipe
Type: Seamless
Size: 1/2 to 24 Inch
Schedule: SCH40 to XXS
Material: A335 P22 (2.25Cr-1Mo)
Standard: ASTM A335, ASME B36.10M
End: Bevel End or Plain End
Feature: Dimensional Tolerance per ASME B36.10M
Size, schedule and material are confirmed per inquiry, and a detailed specification sheet is available on request.

Dimensional control is the unglamorous half of alloy pipe supply. Wall thickness, outside diameter and length follow the standard table and its tolerances, which is what keeps a shop spool meeting a field valve without rework. Order the end preparation the welding procedure expects, keep the bevel faces clean, and protect them with caps in storage and transit. Where the line is prefabricated, have the fit-up checked against the drawing before the root pass, not after.

The metallurgy then asks for its usual discipline: a qualified procedure, preheat and interpass control, low-hydrogen consumables, and post-weld heat treatment where the code or the service requires it. PMI at receipt and hardness checks after welding close the loop, and NDT on the butt welds documents the joint for the project file. P22 welds well when treated properly, and the pipe pays that back with a long service life in the run and low maintenance in the years that follow.

FAQ

Q1. What do I gain by moving from carbon steel to P22?

Strength at temperature and an oxidation reserve carbon steel cannot match, thanks to 2.25% chromium and 1% molybdenum. If the line is hot, pressurised or simply must last, P22 is a measured step up. For cold utility duty, the upgrade is mostly cost.

Q2. How fussy is the fit-up on this pipe?

The pipe is not fussy; the tolerances are just honest. Check the wall and the outside diameter on arrival, machine the bevels, and keep the root gap where the procedure wants it. Do that and the joint comes together the way the drawing promised.

Q3. Can P22 be welded with the same consumables as carbon steel?

No. The joint needs a matching or approved Cr-Mo consumable, with preheat and usually controlled interpass temperature. Using carbon steel filler on P22 dilutes the joint and stores up trouble. Qualify the procedure first, then let the crew repeat it.

Q4. What's the minimum I can order for A335 P22 seamless pipe?

Standard flange insulation gasket kits start at one set, and standard gaskets, studs, washers and sleeves start at one piece. Kits made to your drawing or for a non-standard bolt pattern are quoted individually, because the minimum really depends on the material and the tooling involved.

Send Message