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ASTM A335 / ASME SA335 P11 – UNS K11597
Same spec buyers trust from Jindal, MSL & ISMT
1Cr – 0.5Mo Ferritic Chrome Moly
Equivalent to DIN 13CrMo4-5 / NBR 5603 P11
Hot Rolled & Cold Drawn
Produced with proper heat treatment for consistent metallurgy
1/2″ – 24″ NPS
Every schedule, ex-stock – ready to cut
SCH 40, SCH STD, SCH 80, SCH XS, SCH 160
High pressure wall thickness on demand
PE (Plain End) & BE (Beveled Ends)
Ready for field welding or fabrication
Mill-Direct Pricing
Stockist rates, zero broker markup
1/2″–24″ Sizes
SCH 40, STD, 80/XS, 160 & XXS wall
PE / BE Ends
Plain or bevelled, mill-finished
Dual Code Certified
ASTM A335 & ASME SA335 P11, every heat
Inspection Ready
SGS, Bureau Veritas, TUV, Lloyd’s
Hot Rolled / Cold Drawn
6m, 12m or cut-to-length
📌 Table of Contents
When sourcing ASTM A335 P11 Pipe, buyers care about one thing most – finding a stockist who already has the exact size, schedule and heat number on hand. At Aesteiron Steels LLP, SA335 Gr P11 Seamless Pipe is stocked across all standard NPS sizes and schedules, meaning a confirmed order goes directly into packing instead of waiting on a mill production run.
Known interchangeably as ASTM A335 P11 Alloy Steel, UNS K11597, or under its European designation 13CrMo4-5, this 1Cr-0.5Mo ferritic grade is widely specified for applications where temperatures exceed the limits of plain carbon steel yet don't demand the higher-alloy P22 or P91 grades. It's commonly found in superheater headers, reheater loops, and refinery furnace tubing.
Every shipment dispatched from our Mumbai stockyard to destinations across the Middle East, Africa, and the Americas comes with dual ASTM/ASME certification, PMI testing, and an EN 10204 mill test certificate – giving EPC contractors and MRO buyers the confidence to skip the delays that come with fresh casting.
Key specs for ASTM A335 P11 Pipe – standard, size, length and finish, summarized here.
Fixed outer diameter per pipe size with wall thickness varying by schedule for the sizes shown below.
| NPS | OD (mm) | OD (inch) | DN |
|---|---|---|---|
| 8″ | 219.1 | 8.625 | DN200 |
| 1½″ | 48.3 | 1.900 | DN40 |
| 16″ | 406.4 | 16.000 | DN400 |
| 3/4″ | 26.7 | 1.050 | DN20 |
| 24″ | 610.0 | 24.000 | DN600 |
| 1″ | 33.4 | 1.315 | DN25 |
| 4″ | 114.3 | 4.500 | DN100 |
| 1/2″ | 21.3 | 0.840 | DN15 |
| 12″ | 323.8 | 12.750 | DN300 |
| 20″ | 508.0 | 20.000 | DN500 |
| 2″ | 60.3 | 2.375 | DN50 |
| 10″ | 273.0 | 10.750 | DN250 |
| 6″ | 168.3 | 6.625 | DN150 |
| 3″ | 88.9 | 3.500 | DN80 |
Every construction type of alloy steel pipe we supply, shown here at a glance.
Send us your required size, schedule and quantity – our team at Aesteiron will get back with a quote, MTC details and delivery timeline within 48 hours.
Countries Where We Regularly Deliver
These are the mills Aesteiron stocks direct for, as a Distributor and Stockholder, not a broker.
Tubacex
ISMT
ArcelorMittal
Nippon Steel
Jindal SAW
Maharashtra Seamless
Vallourec
TPCO
Salzgitter Mannesmann
JFE Steel
Ratnamani Metals & Tubes
Tenaris
Aesteiron holds P11 Seamless Pipe in stock across India, covering the complete 1/2″–24″ range with cut-to-length options and quick turnaround quotes.
Resourceful ASTM A335 P11 Pipe Stockist in Mumbai also stocking DIN/JIS equivalent grades.
Dependable ASTM A335 P11 Pipe Stockist in Mumbai backed by verified composition certificates.
| Grade | C % | Mn % | Si % | Cr % | Mo % | P (max) | S (max) |
|---|---|---|---|---|---|---|---|
| P11 | 0.05–0.15 | 0.30–0.60 | 0.50–1.00 | 1.00–1.50 | 0.44–0.65 | 0.025 | 0.025 |
| P22 | 0.05–0.15 | 0.30–0.60 | 0.50 max | 1.90–2.60 | 0.87–1.13 | 0.025 | 0.025 |
| P12 | 0.05–0.15 | 0.30–0.61 | 0.50 max | 0.80–1.25 | 0.44–0.65 | 0.025 | 0.025 |
Wall thickness by schedule for a fixed OD, with higher schedule numbers meaning thicker walls and higher pressure ratings.
| NPS | SCH 80 | SCH 60 | SCH 40 | SCH 10 | SCH 5 |
|---|---|---|---|---|---|
| 18″ | 23.80 | 19.05 | 14.27 | 6.35 | – |
| 1/4″ | 3.02 | – | 2.24 | 1.65 | 1.24 |
| 10″ | 15.06 | 12.70 | 9.27 | 4.19 | 3.40 |
| 3/4″ | 3.91 | – | 2.87 | 2.11 | 1.65 |
| 32″ | – | – | 17.48 | 7.92 | – |
| 2″ | 5.54 | – | 3.91 | 2.77 | 1.65 |
| 6″ | 10.97 | – | 7.11 | 3.40 | 2.77 |
| 1/8″ | 2.41 | – | 1.73 | 1.24 | 0.89 |
| 24″ | 30.94 | 24.59 | 17.45 | 6.35 | – |
| 1-1/2″ | 5.08 | – | 3.68 | 2.77 | 1.65 |
| 14″ | 19.05 | 15.06 | 11.10 | 6.35 | – |
| 3″ | 7.62 | – | 5.49 | 3.05 | 2.11 |
| 26″ | – | – | – | 7.92 | – |
| 1″ | 4.55 | – | 3.38 | 2.77 | 1.65 |
| 36″ | – | – | 19.05 | 7.92 | – |
| 5″ | 9.53 | – | 6.55 | 3.40 | 2.77 |
| 20″ | 26.19 | 20.62 | 15.06 | 6.35 | – |
| 3/8″ | 3.20 | – | 2.31 | 1.65 | 1.24 |
| 8″ | 12.70 | 10.31 | 8.18 | 3.76 | 2.77 |
| 1-1/4″ | 4.85 | – | 3.56 | 2.77 | 1.65 |
| 28″ | – | – | – | 7.92 | – |
| 12″ | 15.06 | 12.70 | 9.27 | 4.57 | 4.19 |
| 1/2″ | 3.73 | – | 2.77 | 2.11 | 1.65 |
| 22″ | 28.58 | 22.23 | – | 6.35 | – |
| 2-1/2″ | 7.01 | – | 5.16 | 3.05 | 2.11 |
| 16″ | 21.41 | 16.66 | 12.70 | 6.35 | – |
| 3-1/2″ | 8.08 | – | 5.74 | 3.05 | 2.11 |
| 30″ | – | – | – | 7.92 | – |
| 4″ | 8.56 | 7.14 | 6.02 | 3.05 | 2.11 |
| 34″ | – | – | 17.48 | 7.92 | – |
Quality-assured ASTM A335 P11 Pipe Stockist in Mumbai with tolerance-checked stock.
Our team verifies dimensional tolerance prior to dispatch and provides a detailed report alongside the mill test certificate.
Practical benefits that matter most when sourcing this alloy grade of pipe.
Grade, size and schedule priced back within two business days.
Buy one length or one container – same ex-stock price list.
Faster clearance across GCC, Africa and the Americas.
EPC contractors and MRO buyers trust our P-series track record.
PMI plus EN 10204 3.1/3.2 MTC on every SA335 P11 heat.
Ready-to-weld lengths, no third-party job work delay.
Standard minimums shown – confirm project specific criteria on your data sheet.
Core physical properties of this alloy grade at a glance.
Approx. 200 GPa (29,000 ksi)
7.85 g/cm³
Approx. 42 W/m·K at room temp.
Approx. 1450–1510°C
Established ASTM A335 P11 Pipe Supplier in India providing hydro, UT and RT tested pipes.
PMI
Impact Test (Charpy)
Ultrasonic Test
SGS / BV / TUV
Hydrostatic Test
Radiography
MTC 3.1 / 3.2
Visual & Dimensional Inspection
Trusted ASTM A335 P11 Pipe Exporter in India supplying pipes with hardness maintained within 79 - 95 HRB as per ASTM norms.
Useful for thermal-cycling and start-up calculations on superheater and reheater circuits.
Cp ≈ 460 J/kg·K (0.46 kJ/kg·K) at room temperature
Specific heat capacity increases gradually with service temperature for this 1Cr-0.5Mo chemistry.
Reference stress values by temperature – verify against current ASME B31.1 / B31.3 tables before finalising a design.
Trusted ASTM A335 P11 Pipe Supplier in India offering normalized and tempered pipes.
Applied after cold working or welding
845–900°C, furnace cool – softens for cold work
900–930°C, air cool – refines grain structure
730–760°C – restores ductility, relieves stress
Reliable ASTM A335 P11 Pipe Exporter in India offering pipes suited for low-hydrogen electrode welding.
150–300°C
E80XX-B2 / ER80S-B2
Max 300°C controlled
705–745°C stress relieve
RT / UT verification
Our technical team can provide indicative preheat, filler and PWHT parameters along with your material test certificate.
Key differences between the two manufacturing routes for this pipe.
The finish buyers choose usually comes down to storage time, shipping distance and whether the pipe stays exposed before install.
Standard ex-mill surface, no added coating – the default ex-stock finish.
Acid-pickled to remove mill scale, light oil film applied for transit protection.
Fusion Bonded Epoxy coating for underground or corrosive-atmosphere lines.
Sa 2.5 blast finish plus red-oxide primer for site handling.
Smooth, bright ID/OD finish used on boiler tube sizes.
Internal bore machining on request for a tighter ID tolerance.
Reliable ASTM A335 P11 Pipe Supplier in India serving boilers, power plants and refineries.
Power Plant Boilers
Superheater & Reheater Tubing
Refinery Furnace Piping
Petrochemical Process Lines
Heat Exchangers
Steam Distribution Headers
Oil & Gas Processing Skids
High-Temperature Steam Piping
Pressure rating is governed by ASME B31.1/B31.3 allowable stress at design temperature – the pairing above is a quick field reference only.
Share your design temperature and pressure with us, and we will recommend the right schedule along with a formal quote.
Aesteiron carries and supplies this alloy grade sourced from major global mills through regional stock points spanning the Middle East, Africa, Central Asia and the Americas.
Brazil
Supplier of Vallourec Tubos do Brasil NBR 5603 P11 Pipe Supplier
Port Harcourt, Nigeria
Distributor for TPCO & Jindal SAW ASTM A335 P11 Pipe Distributor
Yerevan, Armenia
Stockist of ArcelorMittal & Tenaris P11 Alloy Pipe Stockist
Cairo, Egypt
Supplier & Stockholder for Vallourec & Salzgitter Mannesmann Stockholder
Victoria, Seychelles
Stocking Distributor for Vallourec & Tenaris P11 Pipe Distributor
Mexico
Stockholder for Tenaris (TAMSA) ASTM A335 P11 Pipe Stockholder
Morocco
Stocking Distributor for Jindal SAW & ISMT P11 Welded Pipe Distributor
Addis Ababa, Ethiopia
Stockholder for Tenaris & ISMT P11 Seamless Pipe Stockholder
Lagos, Nigeria
Supplier of ArcelorMittal & Vallourec Seamless P11 Pipe Supplier
Baku, Azerbaijan
Supplier of Vallourec & ISMT High Alloy P11 Pipe Supplier
Argentina
Stockist of Tenaris Siderca P11 Seamless Pipe Stockist
Johannesburg, South Africa
Distributor for TPCO & ArcelorMittal ASTM A335 P11 Pipe Distributor
Algeria
Stockholder for Tenaris & Salzgitter Mannesmann P11 Pipe Stockholder
Dakar, Senegal
Authorised Stockist of Jindal SAW & ISMT P11 Alloy Pipe Stockist
Casablanca & Tangier, Morocco
Supplier of Jindal SAW & Vallourec Seamless P11 Pipe Supplier
Regional stock is maintained across every location above, keeping this alloy grade ready on demand.
Recent ASTM A335 P11 Pipe supply projects delivered to EPC contractors and plant operators worldwide.
10″ SCH 80, PWHT & PMI certified, EN 10204 3.2 MTC.
Thermal Power Station, South Africa
JOHANNESBURG, SOUTH AFRICA3″ SCH 40, ASTM A335, NACE MR0175, third-party inspected.
Petrochemical Plant Contractor, USA
HOUSTON, TEXAS, USA2″ SCH 80, seamless, PMI & hydro-tested, EN 10204 3.1 MTC.
Boiler OEM, Nigeria
LAGOS, NIGERIA4″ SCH 80, ASTM A335 / ASME SA335 P11, PMI & hydro-tested, EN 10204 3.1 MTC.
Refinery EPC Contractor, Saudi Arabia
JUBAIL INDUSTRIAL CITY, KSA8″ SCH 60, bevelled ends, NACE MR0175, SGS inspected, DRL.
Gas Processing Facility, Egypt
ALEXANDRIA, EGYPT6″ SCH 80, seamless, PWHT & PMI certified, EN 10204 3.2 MTC.
Independent Power Producer, UAE
JEBEL ALI, DUBAI, UAEP11 has added Chromium and Molybdenum for heat resistance; Carbon Steel Pipe is limited to normal temperature and pressure service.
P22 suits higher heat and pressure service. P11 is ideal for lighter superheater and reheater duty at lower cost.
EN 10204 3.1 certificate as standard; 3.2 third-party certification available on request.
Stock sizes dispatch in 2 days; custom or bulk orders take 6–10 weeks depending on size and testing.
Up to roughly 593°C (1100°F), suitable for superheater, reheater and refinery furnace lines.
Why Aesteiron?
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Conclusion
ASTM A335 P11 Pipe, dual-certified to ASME SA335 under UNS K11597, is the standard choice for superheater, reheater and refinery furnace piping wherever service temperature rules out plain carbon steel. Buyers across the Middle East, Africa and the Americas trust Aesteiron Steels LLP as one of the most responsive ASTM A335 P11 Pipe suppliers for quick quotes.
Quick form – quote in 2 hours.
