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Alloy steel pipe is pipe made from steel that's had chromium and molybdenum added to it, that's the whole idea. Plain carbon steel starts to lose its strength once things get hot, so wherever a line is running above roughly 400°C — a boiler header, a refinery furnace outlet, a superheater, this is usually what's spec'd instead. It's built to ASTM A335 / ASME SA335, comes seamless or welded, and the grade you pick (P11, P22, P91, and so on) mostly comes down to how much chromium it needs to hold up at temperature.
1/8″ – 48″ NPS
Every size, ex-stock - no minimum order
ASTM A335 / ASME SA335
Same spec buyers trust from Jindal, MSL & ISMT
P1, P2, P5, P9, P11, P12, P22, P91
Full P-series, including critical P91
SCH 10 – SCH XXS
Every wall thickness, ready to cut
Seamless & Welded (EFW)
One source instead of two vendors
EN 10204 3.1 / 3.2
3rd-party verified, every single heat
48-Hour Quotation
Pricing confirmed in 2 business days
Dual Code Certified
ASTM A335 & ASME SA335, every heat
Inspection Ready
SGS, Bureau Veritas, TUV, Lloyd’s
Container-Load Export
FCL/LCL to Middle East, Africa, Americas
Custom Cutting & Threading
Cut, bevel, thread - any grade
Mill-Direct Pricing
Stockist rates, zero broker markup
📌 Table of Contents
Aesteiron Steels LLP supplies Alloy Steel Pipe for refineries, boiler plants and process lines where ordinary carbon steel gives up under sustained heat, cyclic pressure or corrosive media. Our Seamless and Welded program runs from everyday Low Alloy grades through to P91 for the toughest power-plant headers. As a leading Alloy Steel Pipe Supplier in India, Aesteiron Steels LLP maintains large ex-stock inventory of seamless and welded pipes in Grades P1 to P91, ready for immediate dispatch.
Every heat is dual-certified to ASTM A335 and ASME SA335, with stock moved ex-India through regional hubs across the Middle East, Africa and the Americas for fast dispatch. Our position as a trusted Alloy Steel Pipe Supplier in India is backed by mill test certificates, PMI testing, and direct-from-stock pricing with no middleman markup.
What keeps buyers coming back is our ISO 9001:2015 systems, an in-house metallurgical team that checks every heat, and a track record across 80+ countries. From small orders to bulk projects, we deliver as a dependable Alloy Steel Pipe Supplier in India, on time
We are a well-established Alloy Steel Pipe Stockist in Mumbai with ready stock in all sizes and schedules.
A trusted Alloy Steel Pipe Manufacturer In India means chemistry that's always right, every heat.
Being based in Mumbai keeps our lead times short and pricing competitive as your Alloy Steel Pipe Stockist.
Choosing experienced Alloy Steel Pipe Stocking Distributors means faster procurement and fewer disruptions.
General duty, up to 800°F
Refinery-grade, hydroprocessing ready
High sulfidic corrosion resistance
Power-plant superheater standard
Boiler & steam line workhorse
Critical power-plant headers
Creep-resistant to 1200°F
Large-diameter, fusion-welded pipe
European boiler-grade pipe
Cold-service seamless pipe
Structural & process Cr-Mo
GB high-temp power grade
Share your grade, size and schedule – Aesteiron’s desk replies with pricing, MTC and lead time within 48 hours.
Vallourec
Tenaris
ArcelorMittal
Jindal SAW
ISMT
Salzgitter Mannesmann
TPCO
Nippon Steel
Maharashtra Seamless
Ratnamani Metals & Tubes
Tubacex
JFE Steel
| Grade | UNS | C max | Mn % | Cr % | Mo % | P max | S max | Si % |
|---|---|---|---|---|---|---|---|---|
| P92 / T92 | K92460 | 0.07-0.13 | 0.30-0.60 | 8.50-9.50 | 0.30-0.60 | 0.020 | 0.010 | 0.50 |
| P11 / T11 | K11597 | 0.05-0.15 | 0.30-0.61 | 1.00-1.50 | 0.44-0.65 | 0.025 | 0.025 | 0.50-1.00 |
| P5b / T5b | K51545 | 0.15 | 0.30-0.60 | 4.00-6.00 | 0.44-0.65 | 0.025 | 0.025 | 1.00-2.00 |
| P1 / T1 | K11522 | 0.10-0.20 | 0.30-0.80 | - | 0.44-0.65 | 0.025 | 0.025 | 0.10-0.50 |
| P22 / T22 | K21590 | 0.05-0.15 | 0.30-0.60 | 1.90-2.60 | 0.87-1.13 | 0.025 | 0.025 | 0.50 |
| P9 / T9 | S50400 | 0.15 | 0.30-0.60 | 8.00-10.00 | 0.44-0.65 | 0.025 | 0.025 | 0.50-1.00 |
| P5c / T5c | K41245 | 0.12 | 0.30-0.60 | 4.00-6.00 | 0.44-0.65 | 0.025 | 0.025 | 0.50 |
| P12 / T12 | K11562 | 0.05-0.15 | 0.30-0.60 | 0.80-1.25 | 0.44-0.65 | 0.025 | 0.025 | 0.50 |
| P2 / T2 | K11547 | 0.10-0.20 | 0.30-0.61 | 0.50-0.81 | 0.44-0.65 | 0.025 | 0.025 | 0.10-0.30 |
| P5 / T5 | K41545 | 0.15 | 0.30-0.60 | 4.00-6.00 | 0.44-0.65 | 0.025 | 0.025 | 0.50 |
| P91 / T91 | K91560 | 0.08-0.12 | 0.30-0.60 | 8.00-9.50 | 0.85-1.05 | 0.020 | 0.010 | 0.20-0.50 |
Where these three actually sit next to each other in real projects: P11 carries around 1.25% chromium and is what you'll usually see specced for service up to about 550°C. Push into higher-pressure headers and P22 takes over — roughly 2.25% Cr, holding up to around 580°C. P91 is a different animal entirely. It's not just a Cr bump; it adds vanadium and niobium on top of ~9% chromium, and that combination is what lets it run past 600°C without creeping the way P11 or P22 eventually would. Picking between them mostly comes down to design temperature and how much of a premium the project can absorb for that extra margin.
Values represent standard ASTM A335 minimums – confirm project-specific acceptance criteria on your Alloy Steel Pipe Material Specification sheet.
Outside diameter (OD) is fixed per NPS under ASME B36.10M – wall thickness changes with schedule. Full range runs 1/8″ to 48″ NPS; common construction sizes below.
| NPS | OD | XXS | 160 S | 20 S | 10 S | 5 S | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| inch | mm | mm | Weight in kilogram | WT mm | Weight in kilogram | WT mm | Weight in kilogram | WT mm | Weight in kilogram | WT mm | Weight in kilogram | WT mm |
| 12 | 300 | 323.8 | 186.97 | 25.4 | 238.76 | 33.32 | 49.7 | 6.35 | 36 | 4.57 | 31.25 | 3.96 |
| 1/8 | 3 | 1 .3 | .33 | 1.5 | .28 | 1.24 | .2 | 1.2 | ||||
| 2 | 50 | 6 .3 | 13.44 | 11.07 | 11.11 | 8.74 | 4.24 | 3 | 3.93 | 2.77 | 2.4 | 1.65 |
| 8 | 200 | 219.1 | 107.92 | 22.23 | 111.27 | 23.01 | 33.31 | 6.35 | 19.96 | 3.76 | 14.79 | 2.77 |
| 3/4 | 20 | 26.7 | 3.64 | 7.82 | 2.9 | 5.56 | 1.52 | 2.55 | 1.28 | 2.11 | 1.03 | 1.65 |
| 5 | 125 | 141.3 | 57.43 | 19.05 | 49.11 | 15.88 | 16.8 | 5 | 11.57 | 3.4 | 9.47 | 2.77 |
| 3/8 | 10 | 17.1 | .74 | 2 | .63 | 1.65 | .47 | 1.2 | ||||
| 1 1/4 | 32 | 42.2 | 7.77 | 9.7 | 5.61 | 6.35 | 2.9 | 3 | 2.7 | 2.77 | 1.65 | 1.65 |
| 3 | 80 | 88.9 | 27.68 | 15.24 | 21.3 | 11.1 | 8.37 | 4 | 6.45 | 3.05 | 4.51 | 2.11 |
Aesteiron stocks Seamless Alloy Steel Pipe ex-India, every schedule ready. Your Alloy Steel Pipe Stockist in Mumbai, with cut-to-length and same-day quotes.
Wall thickness (mm) by schedule for the same OD – higher schedule number means thicker wall and higher pressure rating.
| Nominal Pipes Size | OD | Sch 40 | Sch 80 | ||
|---|---|---|---|---|---|
| Weight Per Ft. | Wall Thickness | Weight Per Ft. | Wall Thickness | ||
| 5 | 5.563 | 14.620 | 0.258 | 20.780 | 0.375 |
| 1-1/2 | 1.900 | 2.718 | 0.145 | 3.631 | 0.200 |
| 12 | 12.750 | 53.570 | 0.406 | 88.710 | 0.688 |
| 1/4 | 0.540 | 0.425 | 0.088 | 0.535 | 0.119 |
| 3-1/2 | 4.000 | 9.109 | 0.226 | 12.510 | 0.318 |
| 1 | 1.315 | 1.679 | 0.133 | 2.172 | 0.179 |
| 8 | 8.625 | 28.550 | 0.322 | 43.390 | 0.500 |
| 1/2 | 0.840 | 0.851 | 0.109 | 1.088 | 0.147 |
| 2-1/2 | 2.875 | 5.793 | 0.203 | 7.661 | 0.275 |
Wt (kg/m) = (OD − WT) × WT × 0.02466
OD & WT in millimetres – instant estimate before final mill weighment.
Enter OD and wall thickness in millimetres for an instant estimate – useful for quoting before final mill weighment.
Wt (kg/m) = (OD − WT) × WT × 0.02466
List of Locations Where We Have Frequent Deliveries
Source ISMT Made Alloy Pipes With MTC At Factory Price Held To Zero Broker Margin, Refer Manufacturing Process
As an Alloy Steel Pipe Manufacturer In India, we deliver consistent quality, order after order.
Solid billet is rotary-pierced into a hollow shell.
Shell is elongated on a mandrel to the target OD and WT.
Final pass brings the pipe to precise dimensional tolerance.
Normalize / temper cycle to meet mechanical property targets.
Rotary straightening corrects camber before finishing.
NDT, dimensional check, stencilling and export packing.
Short version: if it's under 24" and pressure matters, go seamless. Once you're past that size, welded (EFW) is really the only practical route, and it holds up fine for most transmission work.
Aesteiron's Alloy Steel Welded Pipe delivers faster at lower landed cost. A growing Alloy Steel Pipe Exporter, shipping to the Middle East, Africa, and Europe.
The line is really just chromium content. Under about 4% Cr, it's classed low alloy — fine for general elevated-temperature duty. Once you're at 5% Cr and up (P9, P91), you're into high alloy territory, built for the genuinely severe, critical-service headers.
150–300°C per grade
E90XX-B3 / matching filler
Controlled max temp
Stress relieve per code
RT / UT verification
Refines grain structure for toughness
Relieves stress, restores ductility
Softens pipe for cold working
Air-cool cycle for martensitic grades
Nickel & Moly market rates
Higher Cr grades cost more
Cutting, beveling, threading add-ons
3rd-party inspection level
FCL orders reduce unit cost
FOB / CFR / CIF freight basis
Stable protective scale up to 1200°F
Sustains load under long-term heat
Meets Nelson curve guidance for refineries
Suited to sour-service crude units
Hydro Test
Ultrasonic Test
Radiography
PMI
MTC 3.1 / 3.2
SGS / BV / TUV
Match °F rating to grade
Check schedule & WT
Sour, oxidising or clean service
ASME B31.1 / B31.3 rules
Aesteiron backs every Alloy Steel Pipe heat with EN 10204 3.1/3.2 MTC. A trusted Alloy Steel Pipe Exporter, with export documentation and container-ready packing.
Global buyers choose us as their Alloy Steel Pipe Exporter for quality and transparent pricing.
Power Plants & Boilers
Oil & Gas Refineries
Petrochemical Plants
Fertilizer Plants
Heat Exchangers
Cross-Country Pipelines
Desalination Plants
Cement & Metallurgical Plants
Aesteiron holds and moves Vallourec, Tenaris, ArcelorMittal, Jindal SAW, ISMT, Salzgitter Mannesmann and TPCO origin Alloy Steel Pipe through regional stock points across the Middle East, Africa and the Americas. We are one of India's active Alloy Steel Pipe Stocking Distributors, holding steady stock to avoid delays.
Dakar, Senegal
Stocking Distributor for Vallourec & Tenaris Alloy Steel Pipe Distributor
Lagos, Nigeria
Authorised Stockist of Jindal SAW & ISMT Pipe Alloy grades Stockist
Algeria
Supplier of ArcelorMittal & Vallourec Seamless Alloy Steel Pipe Supplier
Port Harcourt, Nigeria
Stockholder for Tenaris & Salzgitter Mannesmann Pipe Stockholder
Baku, Azerbaijan
Distributor for TPCO & Sumitomo Alloy Steel Pipe Distributor
Yerevan, Armenia
Supplier of Vallourec & ISMT High Alloy Steel Pipe Supplier
Morocco
Stockist of ArcelorMittal & Jindal SAW Alloy Pipes Stockist
Cairo, Egypt
Stocking Distributor for Tenaris & Vallourec Alloy Steel Welded Pipe Distributor
Johannesburg, South Africa
Supplier & Stockholder for ISMT & Salzgitter Mannesmann Stockholder
Casablanca & Tangier, Morocco
Distributor for TPCO & ArcelorMittal Alloy Steel Pipe Distributor
Addis Ababa, Ethiopia
Supplier of Jindal SAW & Vallourec Seamless Alloy Pipe Supplier
Mexico
Stockholder for Tenaris (TAMSA) Alloy Steel Pipe Stockholder
Argentina
Stockist of Tenaris Siderca Alloy Steel Seamless Pipe Stockist
Brazil
Supplier of Vallourec Tubos do Brasil & ArcelorMittal Pipe Supplier
Our Alloy Steel Pipe Stocking Distributors network keeps P11, P22, and P91 pipes ready on demand.
2″ SCH 80, ASTM A335 / ASME SA335, PMI & hydro-tested, EN 10204 3.1 MTC.
Refinery EPC Contractor, Saudi Arabia
JUBAIL INDUSTRIAL CITY, KSA4″ SCH 40, seamless, hot-bend & PWHT, third-party witnessed.
Independent Power Producer, Nigeria
LAGOS, NIGERIA6″ SCH 80, ASTM A335, NACE MR0175, SSCC tested.
Petrochemical Plant Contractor, USA
HOUSTON, TEXAS, USA8″ SCH 60, beveled ends, NACE MR0175, SGS inspected, DRL.
Gas Processing Facility, Egypt
ALEXANDRIA, EGYPT10″ SCH 80, PWHT & PMI certified, EN 10204 3.2 MTC.
Thermal Power Station, South Africa
JOHANNESBURG, SOUTH AFRICA12″ SCH 120, hot-bending & PWHT 760°C, third-party witnessed.
LNG Terminal Contractor, USA
BATON ROUGE, LOUISIANA, USABuyers stay with us because as an Alloy Steel Pipe Manufacturer In India, we get it right the first time.
Alloy Steel Pipe contains added Chromium and Molybdenum for high temperature and creep strength, while Carbon Steel Pipe is used mainly for standard temperature and pressure service without added alloying elements.
Alloy Steel Pipe price depends on grade and Chromium-Molybdenum content, wall thickness and schedule, seamless or welded type, length and end finish, testing level, and order quantity.
Higher chromium grades such as P9, P11, P22 and P91 offer strong oxidation resistance, creep rupture strength and hydrogen attack resistance, making them suitable for boiler and refinery service up to 1200°F and above.
Standard testing includes hydrostatic test, ultrasonic test, radiography, positive material identification and mill test certificate as per EN 10204 3.1 or 3.2, along with third party inspection on request.
Grade selection depends on design temperature, operating pressure, the process medium and applicable piping code, with higher Chromium-Molybdenum grades chosen for higher temperature and more corrosive service.
Why Aesteiron?
Tools & Downloads
Conclusion
Alloy Steel Pipe in Seamless and Welded form, certified to ASTM A335 / ASME SA335, is the right choice for boiler, refinery and high-temperature pipeline projects. Buyers across India trust Aesteiron Steels LLP as one of the most responsive Alloy Steel Pipe Dealers for quick quotes.
Quick form – quote in 2 hours.
