Grade overview

Its chromium and molybdenum content provides improved creep and oxidation performance compared with lower-alloy P11.

Typical applications

Boiler piping, steam lines, refinery units, high-temperature headers and process piping.

Equivalent / related designations

ASME SA-335 P22 is widely used in pressure systems. Welding commonly requires preheat and PWHT under applicable procedures.

Common manufacturers and supply

Produced by major seamless alloy-pipe manufacturers worldwide.

Fabrication and selection notes

Confirm the exact product standard, edition, dimensions, delivery condition, mechanical properties, impact requirements, heat treatment, welding procedure, corrosion environment and certification. A grade name alone is not sufficient for procurement or design approval.

QA/QC documentation

For critical service, verify heat number traceability, mill test certificate, chemical analysis, tensile/impact results where required, NDT, heat-treatment record and project-specific third-party inspection requirements.

Element Folio engineering reference. Requirements vary by standard edition, product form and manufacturer; verify the latest governing specification.