ASTM A182 F91
ASTM A182 F91 Forged Alloy Steel Supplier in Tunisia
ASTM A182 F91 is a high-performance chromium-molybdenum-vanadium alloy steel grade used for forged or rolled piping components intended for pressure service. It is designed for demanding industrial applications where elevated-temperature strength, creep resistance and controlled material properties are essential.
The ASTM A182/A182M specification covers forged or rolled alloy and stainless steel piping components, including flanges, fittings, valves and similar parts for pressure service. F91 is a creep-strength-enhanced ferritic alloy steel commonly associated with high-temperature power generation, steam systems and selected industrial process applications.
Emirerri Steel supports industrial procurement requirements for ASTM A182 F91 forged alloy steel components according to project specifications, dimensions, applicable standards and availability.
Key Features
Chromium-molybdenum-vanadium alloy: Developed for demanding high-temperature service.
High-temperature strength: Suitable for applications requiring specified mechanical performance at elevated temperatures.
Creep resistance: Designed for applications involving sustained stress at elevated temperatures.
Controlled microstructure: Heat treatment is essential to achieving the required properties.
Pressure-service components: Used for eligible flanges and other components covered by the applicable product specification.
Material traceability: Testing and documentation can be supplied according to the purchase order.
Specifications
| Parameter | Description |
|---|---|
| Standard | ASTM A182/A182M |
| Grade | F91 |
| Material family | Chromium-molybdenum-vanadium alloy steel |
| Product form | Forged or rolled components, as permitted by the specification |
| Service category | Pressure service and elevated-temperature applications |
| Typical components | Flanges, fittings, valve components and other eligible parts |
| Heat treatment | As required by the applicable specification |
| Dimensions | According to the relevant product standard and order |
| Inspection | According to the governing standard and purchase requirements |
| Certification | Material test certificate, subject to order requirements |
The exact product form, heat-treatment condition, dimensions and testing requirements must be confirmed against the applicable ASTM A182/A182M edition and purchase specification.
ASTM A182 F91 – Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.08–0.12 |
| Manganese (Mn) | 0.30–0.60 |
| Phosphorus (P) | 0.020 Max. |
| Sulfur (S) | 0.010 Max. |
| Silicon (Si) | 0.20–0.50 |
| Chromium (Cr) | 8.00–9.50 |
| Molybdenum (Mo) | 0.85–1.05 |
| Vanadium (V) | 0.18–0.25 |
| Nickel (Ni) | 0.40 Max. |
| Niobium (Nb) | 0.06–0.10 |
| Nitrogen (N) | 0.03–0.07 |
| Aluminum (Al) | 0.04 Max. |
ASTM A182 F91 – Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 585 MPa (85 ksi) Min. |
| Yield Strength | 415 MPa (60 ksi) Min. |
| Elongation | 20% Min. |
| Reduction of Area | 40% Min. |
| Brinell Hardness | 248 HBW Max. |
ASTM A182 F91 – Physical Properties
| Property | Typical Value |
|---|---|
| Density | 7.75–7.80 g/cm³ |
| Melting Range | Approx. 1,425–1,510°C |
| Modulus of Elasticity | Approx. 210 GPa at room temperature |
| Thermal Conductivity | Approx. 25–30 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 |
Types of ASTM A182 F91 Forged Components
Depending on the applicable product standard and manufacturer’s capabilities, ASTM A182 F91 may be used for various forged or rolled pressure-service components.
Alloy Steel Flanges
Weld Neck Flanges
Blind Flanges
Slip-On Flanges
Socket Weld Flanges
Threaded Flanges, where permitted by the relevant product specification
Other Components
Eligible piping fittings
Valve components
Forged pressure-service parts
Components manufactured to approved engineering drawings
The availability and suitability of each component depend on the dimensional standard, pressure class, design requirements and manufacturing capability. ASTM A182 F91 identifies the material grade; it does not independently define a component’s pressure rating or dimensions.
High-Temperature Performance
ASTM A182 F91 is used in selected high-temperature installations where strength retention and resistance to creep deformation are important design considerations.
Factors that influence material selection include:
Design and operating temperatures
Internal pressure and applied mechanical loads
Duration of exposure to elevated temperatures
Start-up, shutdown and thermal cycling conditions
Heat-treatment and fabrication requirements
Applicable pressure-piping and equipment design codes
Allowable temperature and pressure must be established by the responsible engineer using the governing design code and project data. They cannot be determined from the grade designation alone.
Oxidation and Corrosion Resistance
The chromium content of F91 contributes to its oxidation behaviour under suitable high-temperature conditions. However, ASTM A182 F91 is a ferritic alloy steel, not a stainless steel grade.
Corrosion performance depends on the operating environment, process fluid, temperature, moisture and other service conditions. Where corrosion resistance is a critical requirement, the material should be evaluated against the actual process conditions and applicable engineering standards.
Heat Treatment, Welding and Fabrication
Heat treatment is a critical aspect of ASTM A182 F91 manufacturing because it helps establish the required microstructure and mechanical properties.
Important fabrication considerations include:
Heat treatment in accordance with the applicable material specification
Qualified welding procedures, where required
Compatible welding consumables
Preheating and post-weld heat treatment, according to the approved procedure
Non-destructive examination, where specified
Material identification and traceability throughout fabrication
F91 components require particular care during welding, repair and heat treatment. The applicable procedures must be established by qualified specialists based on the component geometry, thickness, material condition and service requirements.
ASTM A182 F91 vs. ASTM A182 F22
ASTM A182 F91 and F22 are chromium-containing alloy steel grades used in demanding industrial applications, but their compositions and properties differ.
ASTM A182 F22: A chromium-molybdenum alloy steel used in selected pressure-service and high-temperature applications.
ASTM A182 F91: A chromium-molybdenum-vanadium alloy steel developed for specific applications requiring enhanced elevated-temperature strength and creep performance.
The appropriate grade depends on the design code, operating conditions, required mechanical properties, fabrication requirements and project economics. F22 and F91 should not be substituted for one another without engineering approval.
Quality Control and Certification
Depending on the purchase order and applicable requirements, inspection and documentation for ASTM A182 F91 components 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 inspection scope and documents supplied should be agreed with the manufacturer and stated in the purchase order.
Emirerri Steel – ASTM A182 F91 Forged Alloy Steel Supplier
Emirerri Steel supports industrial buyers in the power generation, oil and gas, refining, petrochemical and process industries.
We can review enquiries for ASTM A182 F91 forged alloy steel flanges and other eligible components according to required dimensions, pressure classes, applicable standards, quantities, inspection requirements and delivery destinations.
Our team can also review requirements for other alloy steel grades based on project specifications and product availability.
Conclusion
ASTM A182 F91 is a chromium-molybdenum-vanadium alloy steel grade used for forged or rolled pressure-service components in selected high-temperature applications. Proper material selection requires verification of the applicable standard, heat-treatment requirements, design conditions and inspection documentation.
Contact Emirerri Steel to discuss your requirements for ASTM A182 F91 forged alloy steel flanges and components.
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