ASTM A335 P11 Alloy Seamless Pipes in seamless and welded to ASTM A 335. Get quotes from verified suppliers on MetalMitra.
- ASTM A335 P11 Alloy Seamless Pipes
- Grade 11
- 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
Need an dependable alloy steel piping? ASTM A335 P11 Alloy Seamless Pipes on MetalMitra come in seamless and welded to ASTM A 335, ready for process, pressure and heat-transfer lines.
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 11 is a 1¼Cr-½Mo alloy steel used for high-temperature pressure piping and boilers. Controlled additions of chromium, molybdenum, nickel or vanadium give alloy steel higher strength, deeper hardenability, better toughness and stronger performance at elevated temperature.
Available forms & variants
- 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.
Performance highlights
- 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 11
| 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) | — |
Typical applications
- Power Plants
- Boilers
- Refineries
- Petrochemical
- Oil & Gas
- Heat Exchangers
- Automotive
- Engineering Components
- Pressure Vessels
- Heavy Machinery
- Fabrication
- General Engineering
Quality checks & certification
Every lot of ASTM A335 P11 Alloy Seamless Pipes sourced through MetalMitra can be inspected and documented to the governing standard and your purchase order.
- 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
Material 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 buy through MetalMitra
- Verified suppliers — Mills, manufacturers and stockists are reviewed by the MetalMitra team before they list.
- One RFQ, several quotes — Share size, grade and quantity once and compare offers side by side.
- Full traceability — Heat numbers, EN 10204 3.1 MTCs and third-party inspection on request.
- Delivered worldwide — Export-worthy packing and shipping to India, the Middle East, Africa, Europe and the Americas.
Ready to buy?
Send your size, grade, quantity and delivery location for ASTM A335 P11 Alloy Seamless Pipes, and matching suppliers on MetalMitra will come back with offers.
Technical note: Values on this page are for reference. Always confirm against the governing standard, your purchase specification and the mill test certificate.
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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