ASTM A335 P11
ASTM A335 P11 Alloy Steel Pipe Supplier in Tunisia
ASTM A335 P11 is a chromium-molybdenum alloy steel grade used for seamless pipes designed for high-temperature service. It is selected for industrial piping systems that require specified mechanical properties and reliable performance under elevated-temperature operating conditions.
The ASTM A335/A335M specification covers seamless ferritic alloy-steel pipe intended for high-temperature applications. Grade P11 is used in selected power generation, refinery, petrochemical and process-industry systems, subject to the applicable design code and operating conditions.
Emirerri Steel supports industrial buyers sourcing ASTM A335 P11 alloy steel pipes according to project specifications, dimensions, inspection requirements and availability.
Key Features
- Chromium-molybdenum alloy: Designed for selected high-temperature industrial applications.
- Seamless construction: Manufactured without a longitudinal weld seam.
- High-temperature suitability: Intended for applications designed around the requirements of ASTM A335.
- Oxidation resistance: Chromium contributes to oxidation behaviour under suitable service conditions.
- Controlled mechanical properties: Depend on the applicable specification, product condition and heat treatment.
- Material traceability: Testing and inspection documentation can be supplied according to purchase requirements.
- Specifications
| Parameter | Description |
|---|---|
| Standard | ASTM A335/A335M |
| Grade | P11 |
| Material family | Ferritic chromium-molybdenum alloy steel |
| Product type | Seamless alloy steel pipe |
| Service category | High-temperature service |
| Outside diameter | As specified in the purchase order |
| Wall thickness | According to schedule or project requirements |
| Length | As specified in the order |
| End preparation | Plain, bevelled or as specified |
| Heat treatment | According to the applicable standard |
| Inspection | As required by the governing standard and purchase order |
| Certification | Material test certificate, subject to order requirements |
Dimensions, tolerances, heat treatment and inspection requirements must be confirmed against the applicable edition of ASTM A335/A335M and the purchase specification.
ASTM A335 P11 – Chemical Composition
| Element | 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 |
ASTM A335 P11 – Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 415 MPa (60 ksi) Min. |
| Yield Strength | 205 MPa (30 ksi) Min. |
| Elongation | 30% Min. |
| Brinell Hardness | 197 HBW Max. |
ASTM A335 P11 – Physical Properties
| Property | Typical Value |
|---|---|
| Density | Approx. 7.85 g/cm³ |
| Melting Range | Approx. 1,425–1,530°C |
| Modulus of Elasticity | Approx. 200–210 GPa |
| Thermal Conductivity | Approx. 30–40 W/m·K |
| Specific Heat Capacity | Approx. 460–500 J/kg·K |
| Coefficient of Thermal Expansion | Approx. 11–13 × 10⁻⁶/°C |
| Magnetic Properties | Magnetic |
High-Temperature Performance
ASTM A335 P11 pipe is used in selected industrial installations where elevated-temperature performance is an important design consideration.
Important material-selection factors include:
Design and operating temperatures
Internal pressure and mechanical loading
Nature and compatibility of the process fluid
Thermal cycling and start-up conditions
Welding and heat-treatment requirements
Applicable piping codes and inspection criteria
The maximum allowable operating temperature must be determined using the applicable design code and engineering data. It cannot be established from the grade designation alone.
Applications
Power Generation
Specified thermal-service piping
Auxiliary piping systems
Industrial heating installations
Oil and Gas
Selected high-temperature process piping
Refinery piping systems
Industrial fluid-transfer applications approved for the grade
Petrochemical and Process Industries
Process piping operating under defined thermal conditions
Industrial heating systems
Selected high-temperature service installations
The suitability of ASTM A335 P11 must be confirmed against operating pressure, temperature, fluid compatibility and the project’s design requirements.
Oxidation and Corrosion Resistance
The chromium content of ASTM A335 P11 contributes to its oxidation behaviour under certain elevated-temperature conditions. However, P11 is an alloy steel and should not be treated as a stainless steel grade.
Its corrosion performance depends on the process fluid, temperature, moisture and operating environment. Where corrosion resistance is critical, material compatibility should be evaluated against the actual service conditions.
Welding and Fabrication
Welding and fabrication of ASTM A335 P11 pipe must follow qualified procedures and the applicable construction code.
Key considerations include:
Qualified welding procedures, where required
Compatible welding consumables
Preheating according to the approved procedure
Post-weld heat treatment, when required
Non-destructive examination according to the governing code
Material identification and traceability
Welding parameters should be established for the pipe dimensions, joint design, welding process and service conditions.
ASTM A335 P11 vs. P5 and P22
ASTM A335 P11, P5 and P22 are alloy-steel pipe grades used for high-temperature service, but their compositions and specified properties differ.
ASTM A335 P11: A chromium-molybdenum grade used in selected industrial thermal-service applications.
ASTM A335 P5: A different chromium-molybdenum grade with its own composition and property requirements.
ASTM A335 P22: A chromium-molybdenum grade selected where its specified properties suit the design conditions.
Grade selection depends on the design code, temperature, pressure, process fluid and required mechanical properties. These grades should not be substituted for one another without engineering approval.
Quality Control and Certification
Depending on the applicable standard and purchase order, inspection and documentation may include:
- Material test certificate
- Chemical composition analysis
- Mechanical testing
- Dimensional inspection
- Visual examination
- Non-destructive testing, where required
- Heat-treatment records, where applicable
- Product marking and material traceability
The actual testing scope and documentation must be agreed with the manufacturer and specified in the purchase order.
Emirerri Steel – ASTM A335 P11 Alloy Steel Pipe Supplier
Emirerri Steel supports industrial buyers in the oil and gas, refining, petrochemical, power generation and process industries.
We can review enquiries for ASTM A335 P11 seamless alloy steel pipes based on required outside diameters, wall thicknesses, schedules, lengths, quantities, inspection requirements and delivery destinations.
Supply is subject to the agreed technical specification, manufacturer capability and availability. Other alloy steel pipe grades can also be considered where appropriate for the project.
Conclusion
ASTM A335 P11 is a seamless chromium-molybdenum alloy steel pipe grade intended for specified high-temperature applications. Proper material selection requires verification of the applicable standard, design conditions, heat treatment and material documentation.
Contact Emirerri Steel to discuss your requirements for ASTM A335 P11 alloy steel pipes and other industrial piping materials.
Contact Us