Astm A335 P5 High Pressure Boiler Pipes
ASTM A335 P5 seamless ferritic chrome-moly alloy steel pipe for high-pressure and elevated-temperature boiler service. Suitable for bending, flanging, forming operations, and fusion welding, supplied with mandatory hydrostatic testing, non-destructive examination, specified mechanical testing, and sea-worthy export packing with full traceability markings.
Standard & Grade
- Standard: ASTM A335 / ASTM A335M
- ASME Equivalent: SA335
- Grade: P5
- UNS: K41545
- Product type: Seamless ferritic alloy steel pipe (Chrome-Moly / Cr-Mo)
Service & Applications
- High-pressure boiler piping
- High-temperature service where creep strength and thermal stability are required
- Power plants, refineries, petrochemical and process piping systems
Material Requirements
- Material shall conform to chemical composition, tensile property, and hardness requirements
- Suitable for bending, flanging, similar forming operations, and for fusion welding
- NDE method applicability may be subject to size-range limitations per the scope of the respective practice
Dimensions
- Outer Diameter (OD): 19.05 mm – 114.3 mm
- Wall Thickness: 2.0 mm – 14 mm
- Length: up to 16000 mm
Chemical Composition (%)
- Carbon (max): 0.15
- Manganese: 0.30 – 0.60
- Phosphorus (max): 0.025
- Silicon (max): 0.50
- Chromium: 4.00 – 6.00
- Molybdenum: 0.45 – 0.65
Mechanical Properties
- Tensile strength, min: 415 MPa
- Yield strength, min: 205 MPa
- Elongation, min (L/T): 30 / 20
Material & Manufacture
- Pipe may be supplied hot finished or cold drawn
- Finishing heat treatment applied as specified for the order and per ASTM A335
Heat Treatment Options
- A (Annealed) / N + T (Normalized & Tempered)
- N + T / Q + T (Quenched & Tempered)
- N + T (Normalized & Tempered)
Inspection & Testing
- Hydrostatic test applied to each length of pipe
- Non-destructive examination (NDE) in accordance with required practices
- Chemical composition inspection
- Mechanical tests: tensile, yield, elongation
- Flattening test
- Hardness test or bend test
- Additional tests as specified: flaring, bending, impact (where required)
- Surface and dimensional inspection
Mechanical Test Sampling
- Batch-type furnace: tests on 5% of pipe from each treated lot (minimum one pipe for small lots)
- Continuous heat treatment: minimum two pipes or 5% of the lot
Surface Treatment
- Oil-dip
- Varnish
- Passivation
- Phosphating
- Shot blasting
Packing & Marking
- Bare packing, bundle packing, or crate packing
- Wooden protection at both pipe ends
- Sea-worthy export packing as required
- Each crate marked with order number, heat number, dimensions, weight, and bundle details