ASTM A335 P9 Alloy Seamless Pipes in seamless and welded to ASTM A 335. Get quotes from verified suppliers on MetalMitra.
- ASTM A335 P9 Alloy Seamless Pipes
- Grade 9
- Seamless
- ERW
- Welded
- EFW
- LSAW
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Specifications
| Dimensions | ASTM, ASME and API |
|---|---|
| Standard | ASTM A 335 / ASME SA 335 |
| Size | 1/2" NB to 36" NB |
| Schedule | SCH 40, SCH 80, SCH 160, SCH XS, SCH XXS, All Schedules, upto 12mm thk |
| Outer Diameter | 19.05mm – 114.3mm |
| Wall Thickness | 2.0mm – 14 mm |
| Type | Seamless |
| End | Plain End, Beveled End, Threaded |
| Form | Round, Square, Rectangular, Hydraulic Etc |
| Length | Single Random, Double Random & Required Length, Custom Size – 12 Meter lengths |
Grades & standards
- ASTM A335
Source ASTM A335 P9 Alloy Seamless Pipes from verified mills, manufacturers and stockists on MetalMitra. Options span seamless and welded, produced to ASTM A 335, and every order can ship with an EN 10204 3.1 certificate.
Choose seamless, ERW, welded or fabricated construction across a broad spread of diameters, wall thicknesses, schedules and lengths for process, pressure and structural lines.
Grade 9 is a 9Cr-1Mo alloy steel with good resistance to high-temperature oxidation and sulphidation. Controlled additions of chromium, molybdenum, nickel or vanadium give alloy steel higher strength, deeper hardenability, better toughness and stronger performance at elevated temperature.
What you can source
- Seamless Pipes — The go-to choice for high-pressure and high-temperature lines.
- ERW Pipes — Economical welded pipe for utility and process piping.
- Welded / EFW Pipes — Fusion-welded construction for large-diameter runs.
- Tubes — Round, square and rectangular tubes, plus U-bends for heat exchangers.
Key properties
- High-Temperature Strength — Chrome-moly chemistry keeps its strength when temperatures climb.
- Creep Resistance — Proven in long-term, high-temperature pressure service.
- Hardenability — Heat-treats well to dial in strength and toughness.
- Durability — Performs reliably under heavy mechanical loads.
Pipes Tolerance – Grade 9
| NPS | OD Tolerance | NPS | WT Tolerance |
|---|---|---|---|
| 1/8" ≤ NPS ≤ 1 1/2" | +/- 0.4 | 1/8" ≤ NPS ≤ 2 1/2" , All T/D ratios | +20%, -12.5% |
| 1 1/2 < NPS ≤ 4" | +/- 0.79 | NPS ≥ 2 1/2" , T/D ≤ 5% | +22.5%, -12.5% |
| 4" < NPS ≤ 8" | +1.59, -0.79 | NPS ≥ 2 1/2" , T/D > 5% | +15%, -12.5% |
| 8" < NPS ≤ 12" | +2.38, -0.79 | (T= Specified Wall Thickness; D = Specified Outside Diameter) | — |
Applications & industries
- Power Plants
- Boilers
- Refineries
- Petrochemical
- Oil & Gas
- Heat Exchangers
- Automotive
- Engineering Components
- Pressure Vessels
- Heavy Machinery
- Fabrication
- General Engineering
Testing & documentation
Inspection and documentation for ASTM A335 P9 Alloy Seamless Pipes follow the applicable standard plus any extra requirements in your PO.
- Dimensional & visual inspection
- Grade verification against the order
- Chemical composition verification
- Mechanical property testing
- Flattening / flaring tests as applicable
- Hydrostatic testing as applicable
- Ultrasonic / eddy current testing as applicable
- EN 10204 3.1 Mill Test Certificate
- Third-party inspection (TPI) on request
Chemical & mechanical properties
Chemical composition and mechanical properties are supplied to the limits of the governing material standard. Actual heat values are reported on the mill test certificate shared with each consignment.
Why source on MetalMitra
- Checked sellers only — Every supplier profile is screened by MetalMitra before it goes live.
- Faster sourcing — Post one requirement and receive competitive offers without chasing calls.
- Paperwork sorted — MTC 3.1, test reports and TPI arranged as your project demands.
- Global logistics — Seaworthy packing and dispatch to project sites across the world.
Request pricing
Post an RFQ for ASTM A335 P9 Alloy Seamless Pipes with your drawing or specification and receive quotes from verified suppliers.
Technical note: Figures shown are indicative. Final acceptance should be based on the applicable standard, approved drawings and the MTC supplied with the material.
Applications & industries
- Power Plants
- Boilers
- Refineries
- Petrochemical
- Oil & Gas
- Heat Exchangers
- Automotive
- Engineering Components
- Pressure Vessels
- Heavy Machinery
- Fabrication
- General Engineering
- Oil & Gas
- Petrochemical & Refining
- Power Generation
- Chemical Processing
- Automotive
Testing & documents
Ask for the documents you need in your requirement — suppliers confirm them in their quotation:
- Mill test certificate to EN 10204 3.1, or 3.2 with third-party witness
- Third-party inspection (TPI) by SGS, Bureau Veritas, TÜV or your nominated agency
- Tests as the standard or your order requires: hydro, PMI, IGC, NDT, hardness or impact tests
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