Alloy Steel P11 Seamless Pipes
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ASTM A335 Alloy Steel P11 Seamless Pipes

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Alloy Steel P11 Seamless Pipe Table of Content

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ASTM A335 Alloy Steel P11 seamless pipes are chromium molybdenum alloy pipes created for extreme heat services in energy plants, processing plants, chemical processing units and steam boilers. Designed to work under high heat and pressure these pipes offer excellent mechanical strength, superior thermal stability and tolerance against oxidation and corrosion.

As a reputed alloy steel P11 seamless pipes manufacturer we offer pipes that match the strict demands of ASME SA335 standards. These seamless pipes are produced using premium alloy steel and go through intense quality testing to guarantee size accuracy, metal processing integrity and enduring dependability in rigorous environments.

Our Alloy Steel P11 Seamless Pipes are perfect for operations involving high temperatures and proactive service conditions like superheaters, heat exchangers, reheaters and pressure vessels. Available in a large variety of sizes and wall thicknesses they are supplied with full transparency, test certification and modification options to match targeted project needs.

Whether you’re sourcing for a large-scale EPC project or a maintenance shutdown, our P11 seamless pipes are ready to ship globally with short lead times and consistent quality.

Product Specifications Of Alloy Steel P11 Seamless Pipes

ASTM A335 Alloy Steel P11 Seamless Pipes are designed for elevated pressure and high temperature operations. created to meet ASME and ASTM guidelines these pipes are mostly used in boilers, heat exchangers, power generation and oil & gas processing systems. Our pipes are supplied in normalized, tempered, or quenched & tempered conditions to ensure optimum performance across a range of operating environments.

The following table outlines the key product specifications for Alloy Steel P11 Seamless Pipes:

Specification Details
Standard ASTM A335 / ASME SA335
Grade P11
Product Type Seamless Ferritic Alloy Steel Pipes
Manufacturing Process Hot Finished / Cold Drawn Seamless
Size Range (OD) 1/2” NB to 36” NB (custom sizes available on request)
Wall Thickness SCH 20 to SCH XXS / Custom thickness available
Length Single Random, Double Random, or Custom Cut Lengths
Pipe Ends Plain End (PE), Beveled End (BE), Threaded End (TE)
Heat Treatment Normalizing, Tempering, Quenching & Tempering (if required)
Surface Finish Black, Bare, Varnished, or Coated
Testing & Inspection Hydrostatic, Ultrasonic, Eddy Current, NDT, Visual, PMI
Compliance NACE MR0175, IBR, PED 2014/68/EU, ISO 9001
All pipes are manufactured with full traceability and supplied with Mill Test Certificates (EN 10204 3.1/3.2) to ensure compliance with project and industry specifications.

Material Details Of Alloy Steel P11 Seamless Pipes

Alloy steel P11 seamless pipes are made using a Chromium Molybdenum alloy designed to tolerate elevated heat service conditions. This material gives a stable combination of power, flexibility and corrosion resistance making it ideal for critical applications in power plants, petrochemical units, and refineries. Each pipe is created to match the metalworking and dimensional standards specified by ASTM A335 assuring long term accuracy and safe performance.

Chemical Composition Of Alloy Steel P11 Seamless Pipes (% by Weight)

Element Carbon (C) Manganese (Mn) Phosphorus (P) Sulfur (S) Silicon (Si) Chromium (Cr) Molybdenum (Mo)
Composition 0.05–0.15 0.30–0.60 ≤ 0.025 ≤ 0.025 0.50–1.00 1.00–1.50 0.44–0.65
Note: Strict control of alloying elements guarantees regular weldability and high temperature performance.

Mechanical Properties Of Alloy Steel P11 Seamless Pipes

Property Tensile Strength Yield Strength (0.2% Offset) Elongation Hardness (HBW) Impact Strength
Value ≥ 415 MPa ≥ 205 MPa ≥ 30% ≤ 163 HB As per standard/application
These characteristics are carefully observed and tested to guarantee that every ASTM A335 P11 seamless pipe matches the criteria of stress resistant systems and challenging industrial conditions.

ASTM A335 P11 Pipe Equivalent :

Alloy Steel P11 Pipes Standard: ASTM A335, ASME SA335
Equivalent Standards: EN 10216-2, ASTM A213, ASME SA213, GOST 550-75, NBR 5603
Alloy Steel Material: P11, K11597
Schedule: SCH5, SCH10, SCH10S, SCH20, SCH30, SCH40, SCH40S, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS
ASTM ASME Equivalent Material JIS G 3458 UNS BS DIN ISO ABS NK LRS
A335 P11 SA335 P11 T11 STPA 23 K11597 3604 P1 621 – – ABS 11 KSTPA 23 –

Alloy Steel P11 Pipes Outside Diameter :

Hot rolled Outside Diameter, mm Tolerance, mm
OD≤101.6 +0.4/-0.8
101.6＜OD≤190.5 +0.4/-1.2
190.5＜OD≤228.6 +0.4/-1.6
Cold Drawn Outside Diameter, mm Tolerance, mm
OD＜25.4 ±0.10
25.4≤OD≤38.1 ±0.15
38.1＜OD＜50.8 ±0.20
50.8≤OD＜63.5 ±0.25
63.5≤OD＜76.2 ±0.30
76.2≤OD≤101.6 ±0.38
101.6＜OD≤190.5 +0.38/-0.64
190.5＜OD≤228.6 +0.38/-1.14

Grade P11 Fabricated Piping Wall thickness :

Hot rolled Outside Diameter, mm Tolerance, %
OD≤101.6, WT≤2.4 +40/-0
OD≤101.6, 2.4＜WT≤3.8 +35/-0
OD≤101.6, 3.8＜WT≤4.6 +33/-0
OD≤101.6, WT>4.6 +28/-0
OD>101.6, 2.4＜WT≤3.8 +35/-0
OD>101.6, 3.8＜WT≤4.6 +33/-0
OD>101.6, WT>4.6 +28/-0
Cold Drawn Outside Diameter, mm Tolerance, %
OD≤38.1 +20/-0
OD>38.1 +22/-0

ASTM A335 P11 Material Heat Treatment Requirements :

Grade Heat Treatment Type Normalizing Temperature Range F [C] Subcritical Annealing or Tempering

Temperature Range F [C]
P5 (b,c) Full or Isothermal Anneal
Normalize and Temper ***** 1250 [675]
Subcritical Anneal (P5c only) ***** 1325 – 1375 [715 – 745]
P9 Full or Isothermal Anneal
Normalize and Temper ***** 1250 [675]
P11 Full or Isothermal Anneal
Normalize and Temper ***** 1200 [650]
P22 Full or Isothermal Anneal
Normalize and Temper ***** 1250 [675]
P91 Normalize and Temper 1900-1975 [1040 – 1080] 1350-1470 [730 – 800]
Quench and Temper 1900-1975 [1040 – 1080] 1350-1470 [730 – 800]

SA335 P11 Pipe Tensile Requirements :

Seamless
P-5 P-9 P-11 P-22 P-91
Tensile Strength, min., psi
ksi 60 60 60 60 85
MPa 415 415 415 415 585
Yield Strength, min., psi
ksi 30 30 30 30 60
MPa 205 205 205 205 415

Chart & ASTM A335 P11 Pipe Weight :

Welded and seamless ASTM A335 P11 Pipe

Grade Heat Treatment Type Normalizing Temperature Range F [C] Subcritical Annealing or Tempering

Temperature Range F [C]
P5 (b,c) Full or Isothermal Anneal
Normalize and Temper ***** 1250 [675]
Subcritical Anneal (P5c only) ***** 1325 – 1375 [715 – 745]
P9 Full or Isothermal Anneal
Normalize and Temper ***** 1250 [675]
P11 Full or Isothermal Anneal
Normalize and Temper ***** 1200 [650]
P22 Full or Isothermal Anneal
Normalize and Temper ***** 1250 [675]
P91 Normalize and Temper 1900-1975 [1040 – 1080] 1350-1470 [730 – 800]
Quench and Temper 1900-1975 [1040 – 1080] 1350-1470 [730 – 800]

ASTM A335 Grade P11 Alloy Steel Seamless Pipe

Sizes, Dimensions and weights section modulus and gallons capacity per linear foot

Grade Heat Treatment Type Normalizing Temperature Range F [C] Subcritical Annealing or Tempering

Temperature Range F [C]
P5 (b,c) Full or Isothermal Anneal
Normalize and Temper ***** 1250 [675]
Subcritical Anneal (P5c only) ***** 1325 – 1375 [715 – 745]
P9 Full or Isothermal Anneal
Normalize and Temper ***** 1250 [675]
P11 Full or Isothermal Anneal
Normalize and Temper ***** 1200 [650]
P22 Full or Isothermal Anneal
Normalize and Temper ***** 1250 [675]
P91 Normalize and Temper 1900-1975 [1040 – 1080] 1350-1470 [730 – 800]
Quench and Temper 1900-1975 [1040 – 1080] 1350-1470 [730 – 800]

Types Of Alloy steel P11 Seamless Pipes :

Alloy Steel P11 Seamless Pipes P11 Alloy Steel A335 Pipe
ASTM A335 grade P11 Seamless Pipes ASTM A335 P11 Alloy Steel Seamless Pipe
High Pressure P11 Boiler Pipe ASME SA335 P11 Alloy Steel Rectangular Pipe
Alloy Steel P11 Seamless Pipes Alloy Steel Gr P11 Heater Pipe
ASME SA335 Alloy Steel P11 Seamless Pipe IBR Alloy Steel P11 Seamless Pipes
Alloy Steel P11 Custom Pipes ASME SA / ASTM A335 P11 Seamless Pipes
Alloy Steel Grade P11 Round Pipe ASME SA335 P11 Seamless Pipes Suppliers
Alloy A335 P11 Seamless Square Pipe ASME SA335 P11 Alloy Steel Seamless Pipe
AISI P11 ERW Pipe ASTM A335 P11 Seamless Pipes
ASTM A335 P11 Boiler Pipe Tubo A335 P11 Pipe
ASME SA335 P11 Seamless Alloy Pipe ASME SA335 P11 Seamless Pipes
ASME SA335 P11 Material ASME SA335 Grade P11 Pipe
ASME SA335 Grade P11 Pipe ASME SA335 Gr P11 Pipe
ASME SA335 P11 Thermal Conductivity Astm A335 Grade P11 Pipe
ASME SA335 Gr P11 Pipe ASME SA335 P11 Material
Astm A335 Gr P11 Pipe ASME SA335 P11 Pipe
Astm A335 P11 Pipe ASME SA335 P11 Piping
ASME SA335 P11 Pipe ASTM A335 P11 Steel
Astm A335 P11 Pipe ASTM A335 P11 Pipe Material
ASTM A335 P11 Piping ASTM A335 P11 Seamless Pipes

Certifications & Quality Assurance

At Lakshya Steel quality is more than a necessity it is a promise we support. Our ASTM A335 Alloy steel P11 seamless pipes are produced under a harsh quality management system created to ensure full observance with both global standards and customer needs. From raw material examination to last delivery every step is recorded trackable and verified.

Mill Test Certificates (MTC)

Each pipe is distributed with EN 10204 3.1 or 3.2 mill test certificates verifying compliance with chemical, mechanical, and dimensional standards outlined in ASTM A335 P11. These certificates provide full traceability from the mill to the end user.

ISO & Regulatory Certifications

We maintain globally recognized certifications to validate our commitment to quality, safety and environmental standards:

  • ISO 9001 – Quality Management System
  • ISO 14001 – Environmental Management
  • ISO 45001 – Occupational Health & Safety
  • PED 2014/68/EU – Pressure Equipment Directive
  • IBR – Indian Boiler Regulation compliance

Third-Party Inspection (TPI)

On request, we arrange third-party inspections by reputed international agencies including:
  • On request, we arrange third-party inspections by reputed international agencies including:
  • Bureau Veritas (BV)
  • TÜV Rheinland
  • SGS
  • DNV
  • Lloyd’s Register
These independent inspections offer an added layer of assurance, verifying that each pipe meets the required technical and safety specifications before shipment.

Applications & Industries Served

ASTM A335 Alloy Steel P11 Seamless Pipes are largely used in industries where extreme heat and high pressure performance is essential. Engineered with a Chromium Molybdenum alloy these pipes offer superior thermal stability, rust resistance and mechanical strength making them perfect for challenging service conditions.

Common Applications:

  • Heat Exchangers – Efficient heat transfer in high temperature systems
  • Boiler Tubes – Designed for high-pressure steam and thermal cycles
  • Power Plants – Used in superheaters, reheaters and economizers
  • Refineries & Petrochemical Plants – Handles high-temperature fluids and gases

Product Availability & Delivery

At Lakshya Steel we preserve a ready stock of ASTM A335 Alloy steel P11 seamless pipes in different sizes, wall thicknesses and lengths to match urgent and huge project needs. Whether it is a small need or a mass order we guarantee timely delivery and flexible delivery options tailored to your schedule.

In-Stock Availability:

  • Sizes: ½” NB to 24” NB
  • Thickness: SCH 20 to SCH XXS
  • Lengths: SRL, DRL & Custom

MOQ

  • Flexible — small to bulk orders accepted.

Customizations

  • Cut-to-length, bending, beveling, coatings, markings, and third-party inspection on request.
Our logistics network and stocking capabilities allow us to serve both urgent shutdown needs and long term procurement contracts across national and international markets. With Lakshya Steel you get reliable delivery and unmatched supply flexibility.

What’s the Price of Alloy Steel P11 Seamless Pipes Per KG in India?

The price of Alloy steel P11 seamless pipes per KG in India generally varies between ₹180 to ₹250 per KG based on on several aspects like:
  • Pipe Size and Wall Thickness
  • Length Requirements (Random or Cut-to-Length)
  • Surface Finish and End Preparation
  • Order Quantity (Small Batch or Bulk Purchase)
  • Applicable Standards (e.g., IBR, NACE, PED)
  • Delivery Location and Logistics
At Lakshya Steel we offer effective, direct supply pricing based on real time market rates and customer requirements. We also support volume-based discounts and custom quotation models for EPC contractors, OEMs, and long term project partners.

Why Choose Lakshya Steel for Alloy Steel P11 Seamless Pipes?

Choosing the right supplier for crucial grade alloy steel pipes is not just about price it’s about accuracy, quality and enduring performance. At Lakshya Steel we bring decades of materials science experience with a determined focus on customer satisfaction to deliver products that match the highest international standards.

Here’s why engineers, procurement heads, and EPC contractors trust us:

  • 25+ Years of Expertise: Trusted supplier for high-performance alloy steel pipes.
  • Strict Quality Control: In-house testing ensures ASTM A335 P11 compliance.
  • Certified & Approved: ISO 9001, PED, IBR, EN 10204 3.1/3.2 — plus third-party inspection.
  • Global Supply: Fast, flexible delivery across Asia, Europe, Middle East & USA.
  • Custom Solutions: Cut-to-size, beveling, stenciling & more — tailored to your specs.

FAQ’s Of Alloy Steel P11 Seamless Pipes

What is P11 alloy steel?
P11 alloy steel is a chromium-molybdenum (Cr-Mo) based low alloy steel mainly used in elevated temperature and high pressure environments like boilers, power plants and processing plants. It follows ASTM A335 standards and offers excellent strength, creep toughness and weldability.
What is the price of P11 alloy steel?
The price of P11 alloy steel seamless pipes in India generally ranges from ₹180 to ₹250 per kg based on size, wall thickness, surface finish and quantity. For bulk or customized orders it’s better to request for a call for the most reliable and latest pricing.
What is the difference between P11 and P22 material?
The main difference lies in their material composition and temperature performance. P11 contains low chromium and molybdenum 1.25Cr-0.5Mo than P22 2.25Cr-1Mo making P22 more appropriate for higher temperature operations because of its superior strength and anti oxidation
What is P22 material grade?
P22 is a high temperature low alloy steel grade under ASTM A335. It consists 2.25% chromium and 1% molybdenum offering excellent tensile capacity, creep strength and corrosion resistance in raised temperature and pressure environments like steam lines and heat transfer units.
Is P11 material magnetic?
Yes, P11 material is magnetic. As a ferritic alloy steel that presents magnetic characteristics because of its iron content and microstructure. This makes it observable by magnetic examination ways useful in particular non destructive testing (NDT) and pipeline observing operations.
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