ASTM A335
ASTM A335 Seamless Ferritic Alloy-Steel Pipe
ASTM A335 (ASME SA335) covers seamless ferritic alloy-steel pipes intended for high-temperature service, such as boilers, heaters, heat exchangers, and power-generation systems.
The specification includes chrome-moly (Cr-Mo) alloy steel grades known for their exceptional strength, creep resistance, and oxidation resistance at elevated temperatures.
Key Features
High-temperature strength suitable for boilers & power plants
Excellent creep resistance due to Cr-Mo alloy composition
Superior oxidation & corrosion resistance
High-pressure service suitability
Available in hot-finished or cold-drawn conditions
Technical Specification
| Property | Description |
|---|---|
| Standard | ASTM A335 / ASME SA335 |
| Product Form | Seamless Ferritic Alloy-Steel Pipes |
| Grades Available | P1, P2, P5, P9, P11, P12, P15, P22, P23, P24, P91, P92, P122 |
| Manufacturing Process | Seamless (Hot-Finished or Cold-Drawn) |
| Heat Treatment | Normalized/Tempered / Quenched/Tempered (Grade dependent) |
| Surface Condition | Black, Bare, Varnished, Pickled |
| Applications | High-Temp & High-Pressure Service |
Manufacturing & Testing
Seamless pipe manufacturing via hot finishing or cold drawing
Heat treatment specific to grade (annealing, normalizing, tempering)
Tensile testing, hardness testing, flattening & flaring tests
Hydrostatic testing or NDE (Eddy Current / Ultrasonic)
Dimensional inspection
PMI testing for alloy verification
Applications
High-temperature boilers
Heat exchangers & superheaters
Refinery heaters
Petrochemical & chemical plants
Power plant piping systems
Steam pipelines & headers
Thermal and nuclear power generation