As a leading distributor of high-performance piping solutions, Excellent Overseas specializes in ASTM A335 Grade P11 Seamless Alloy Steel pipes manufactured by top-tier global mills such as Tenaris, JFE, Nippon Steel, and MSL.
Table of Content
Supply Range & Dimensions
Outer Diameter (OD)1/2" NB to 36" NB
Schedule (WT)SCH 20 up to XXS (max 250mm WT)
LengthSingle Random, Double Random & Custom Length
Grade SpecificationGrade P11 (UNS K11597)
Alloy Make-up1.25% Chrome (Cr), 0.5% Moly (Mo)
Manufacturing FormSeamless Only (Extrusion / Piercing)
Equivalent StandardsEN 10216-2, DIN 17175
TestingHydrostatic, NDT (Eddy Current / UT)
CertificationsEN 10204 3.1 / 3.2, IBR, NACE MR0175
Surface FinishBare, Black Oil, Anti-rust Paint
Value AddedBeveling, Machining, Bending
Export AreasUSA, Saudi Arabia, Kuwait, Europe
Manufacturers in Stock
Tenaris
JFE Steel
Nippon Steel
MSL
ArcelorMittal
Benteler
Tubos Reunidos
Hyundai Steel
Chemical Composition (ASTM A335 Grade P11)
| Element | Symbol | Composition (%) |
|---|---|---|
| Carbon | C | 0.05 - 0.15 |
| Manganese | Mn | 0.30 - 0.60 |
| Phosphorus | P | 0.025 max |
| Sulfur | S | 0.025 max |
| Silicon | Si | 0.50 - 1.00 |
| Chromium | Cr | 1.00 - 1.50 |
| Molybdenum | Mo | 0.44 - 0.65 |
Mechanical Properties
| Property | Metric Units | Imperial Units |
|---|---|---|
| Tensile Strength (Min) | 415 MPa | 60,000 psi |
| Yield Strength (Min) | 205 MPa | 30,000 psi |
| Elongation (Longitudinal) | 30% (min) | |
Heat Treatment Requirements
| Grade | Heat Treatment Type | Minimum Temperature |
|---|---|---|
| Grade P11 | Full or Isothermal Anneal OR Normalize and Temper |
Tempering at 1200°F [650°C] min |
ASTM A335 P11 Applications
High-Temp Boiler Tubes
Power Generation Plants
Oil & Gas Refineries
High-Pressure Steam Lines
Heat Exchanger Networks
Transit Timing & Delivery
| Country | Destination Port | Sea Freight Timing | Air Freight Timing |
|---|---|---|---|
 Saudi Arabia | Dammam / Jubail | 10–14 Days | 1–2 Days |
 UAE | Jebel Ali | 4–6 Days | 1 Day |
 United States | Houston | 38–45 Days | 4–5 Days |
 Germany | Hamburg | 30–34 Days | 2–3 Days |
 Singapore | Port of Singapore | 12–16 Days | 1–2 Days |
Process of Manufacturing
A335 P11 pipes are fabricated using a seamless process involving the piercing of a solid steel billet, providing a robust, weld-free structure for demanding pressure applications.
Coating Material & Protection
Anti-Rust Varnish / Oil
3LPE / 3LPP Coated
FBE Coated
ASTM A335 P11 vs P22
ASTM A335 P11
- • Contains approximately 1.25% Chromium and 0.5% Molybdenum.
- • Perfect for moderate-to-high temperature applications like boiler tubes.
- • More economical than P22, widely used where extreme oxidation resistance is not heavily demanded.
ASTM A335 P22
- • Contains approximately 2.25% Chromium and 1% Molybdenum.
- • The higher chromium content provides better resistance to oxidation and scaling.
- • Preferred for higher temperature environments and more corrosive steam services.
Types of ASTM A335 P11 Pipes
Grade P11 Seamless Pipe
P11 Alloy Boiler Tube
P11 High Temp Pipe
Chrome-Moly P11 Alloy
Countries We Export To
- United States
Canada- Saudi Arabia
- UAE
Qatar
Oman
Kuwait
Bahrain
United Kingdom- Germany
Italy
Spain
Brazil
South Africa
Australia- Singapore
Malaysia
Indonesia
Vietnam
Thailand