About Alloy Pipes
Chrome-moly alloy steel pipes for high-temperature and high-pressure service in refineries, power plants, and petrochemical facilities. ASTM A335 grades P11, P22, P5, P9, P91 - seamless, with IBR certification available.
Use this page as a product and specification reference. The exact material grade, dimensions, manufacturer, certification, inspection scope, quantity, price, availability, freight, and delivery timing are confirmed for the specific RFQ.
Specification reference
| Type | Seamless - hot-finished and cold-drawn |
|---|---|
| Size Range | NPS 1/2" to 24" in Schedules 40, 80, 120, 160, XXS |
| Grades | ASTM A335 P11, P22, P5, P9, P91, P92 |
| Temperature Rating | P11 up to 540°C, P22 up to 565°C, P91 up to 600°C |
| Certification | MTC 3.1/3.2, IBR Form III-C, NACE MR0175 (on request) |
Confirm the exact grade, dimensions, tolerance, test certificate, and current availability for your requirement before ordering.
Common applications
- Power Generation: Main steam lines, hot reheat piping, boiler headers, economizer tubes.
- Refineries: Catalytic cracker piping, hydroprocessing units, heater tubes, furnace piping.
- Petrochemical: Reactor piping, reformer tubes, high-temperature process lines.
- Fertiliser Plants: Ammonia converter piping, synthesis gas lines.
Source mills we work with
We procure from established Indian and global mills selected for the required grade, test certificate, and delivery schedule.
- ISMT Limited
- Maharashtra Seamless Limited (MSL)
- Jindal SAW
- Chandra Metal Enterprises
Applicable standards and specifications
ASTM A335 grade selection guide
How to choose between the common A335 chrome-moly grades - chromium content drives high-temperature oxidation resistance; max metal temperature drives the typical service category.
| Grade | Chromium % | Max temp (°C) | Typical application | RP stock pattern |
|---|---|---|---|---|
| P11 | 1.0-1.5 | 580 | Steam piping, refinery low-temp circuits | Common |
| P22 | 2.0-2.5 | 600 | Superheater, reheater piping | Common |
| P91 | 8.0-9.5 | 625 | Ultra-supercritical boiler main steam | Indent |
| P92 | 8.5-9.5 | 650 | Advanced ultra-supercritical boiler | Indent |
P11 and P22 are stocked off-the-shelf in standard NPS / schedule combinations. P91 and P92 are rolled against indent - typical mill lead time 4-8 weeks depending on size and certification scope (IBR / NACE).
What to include in the RFQ
- Specify the relevant standard or grade where known.
- Provide OD or NB, wall thickness or schedule, required length, and quantity.
- State the delivery city or PIN code and any unloading constraints.
- List MTC, IBR, TPI, marking, inspection, or other documentation requirements.