ASTM A182 F11
ASTM A182 F11 Alloy Steel Forged Fittings / Flanges
ASTM A182 F11 is a specification covering forged or rolled alloy steel pipe flanges, fittings, valves, and parts designed for high-temperature and high-pressure applications. The F11 grade (1¼Cr-½Mo) is a chromium-molybdenum alloy that offers an excellent balance of strength, toughness, and resistance to oxidation and creep at elevated temperatures.
Emirerri Steel manufactures and supplies premium-quality ASTM A182 F11 Forged Fittings and Flanges, ensuring exceptional dimensional accuracy, durability, and performance in industries such as power generation, refineries, chemical processing, and heat exchangers.
Key Features
Superior strength and creep resistance at high temperatures
Excellent oxidation and scaling resistance
Enhanced weldability and machinability
High resistance to pressure and thermal stress
Long-lasting performance with low maintenance
Manufactured to meet international standards (ASME / ASTM / DIN / EN)
Specification
| Specification | Details |
|---|---|
| Standard | ASTM A182 / ASME SA182 |
| Grade | F11 |
| Material | Alloy Steel (1¼Cr-½Mo) |
| Manufacturing Type | Forged / Rolled / Heat Treated |
| Size Range | ½” NB to 48” NB |
| Pressure Rating | Class 150 to 2500 |
| Connection Type | Socket Weld / Threaded / Flanged |
| Dimensions | ASME B16.5, ASME B16.11, MSS SP-79 / SP-95 |
| Form | Elbow, Tee, Cross, Union, Coupling, Plug, Cap, Flange |
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| ASTM | A182 F11 |
| ASME | SA182 F11 |
| UNS | K11572 |
| EN | 1.7335 |
| DIN | 13CrMo4-5 |
| BS | 1503-241A |
Available Sizes
Forged Fittings: ½” NB to 4” NB
Flanges: ½” NB to 48” NB
Pressure Class: 150#, 300#, 600#, 900#, 1500#, 2500#
Thickness: SCH 10S to SCH XXS
Chemical Composition
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.05 – 0.15 |
| Manganese (Mn) | 0.30 – 0.60 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.025 |
| Silicon (Si) | 0.50 – 1.00 |
| Chromium (Cr) | 1.00 – 1.50 |
| Molybdenum (Mo) | 0.44 – 0.65 |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 415 MPa (min) |
| Yield Strength | 205 MPa (min) |
| Elongation | 20% (min) |
| Hardness (Brinell) | ≤ 197 HB |
Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting Point | 1425–1540°C |
| Thermal Conductivity | 25 W/m·K at 100°C |
| Electrical Resistivity | 0.16 µΩ·m at 20°C |
| Modulus of Elasticity | 205 GPa |
Types of ASTM A182 F11 Products
Forged Fittings: Elbow, Tee, Cross, Union, Coupling, Plug, Cap
Flanges: Weld Neck, Slip-On, Blind, Socket Weld, Threaded, Lap Joint
Outlet Fittings: Weldolet, Sockolet, Threadolet
Custom Forged Components: Valve Parts, Discs, Rings, Connectors
Corrosion Resistance
ASTM A182 F11 Alloy Steel provides moderate resistance to oxidation, carburization, and sulfidation in high-temperature environments. The chromium and molybdenum content offers protection against scaling and corrosion in steam and gas service, though additional coatings are recommended for use in highly corrosive or acidic environments.
Heat Resistance
The chromium-molybdenum composition offers excellent heat resistance up to 600°C (1112°F). F11 alloy steel retains strength and creep resistance under continuous thermal exposure, making it ideal for components in boilers, turbines, and steam piping.
Heat Treatment
Normalizing: 950–1000°C followed by air cooling
Tempering: 700–750°C to improve ductility and mechanical properties
Annealing: 870–920°C to relieve internal stresses and refine grain structure
Welding
ASTM A182 F11 can be welded using TIG, MIG, or SMAW processes. Preheating at 200–300°C and post-weld heat treatment (PWHT) are essential to avoid cracking and preserve strength. Use matching filler materials such as ER80S-B2 or E8018-B2 for best results.
Fabrication
F11 alloy steel is easily forgeable and machinable using conventional techniques. It requires controlled temperature management during hot working between 900°C–1200°C. Post-fabrication heat treatment enhances structural uniformity and stress relief.
Applications
Power Generation Boilers & Steam Lines
Heat Exchangers and Pressure Vessels
Oil & Gas Refining Units
Petrochemical and Fertilizer Plants
Turbine Components and Piping Systems
Superheaters and Reheaters