ASTM A182 F304L
ASTM A182 F440 Stainless Steel Flanges
ASTM A182 F440 is a high-chromium ferritic stainless steel grade designed for outstanding oxidation, corrosion, and scaling resistance at elevated temperatures. With chromium content between 25–30%, this alloy offers excellent resistance to hot gases, steam, and oxidizing environments. It combines good mechanical strength with superior stability under thermal stress, making it ideal for heat exchangers, furnace parts, and petrochemical applications.
At Emirerri Steel, we manufacture and supply premium-quality ASTM A182 F440 stainless steel flanges and forged components that meet international standards. Our products ensure exceptional durability, dimensional precision, and performance in aggressive environments.
Key Features
Excellent oxidation and scaling resistance up to 1100°C
Superior corrosion resistance in oxidizing and sulfur-bearing atmospheres
High mechanical strength and hardness
Stable performance under thermal cycling conditions
Good resistance to stress corrosion cracking
Suitable for high-temperature and industrial furnace components
Type of Flanges ASTM A182 F440
Specification
| Specification | Details |
|---|---|
| Standard | ASTM A182 / ASME SA182 |
| Grade | F440 |
| Material Type | Ferritic Stainless Steel |
| Manufacturing Process | Forged / Rolled |
| Forms | Flanges, Fittings, Valves, Forged Components |
| Pressure Class | 150#, 300#, 600#, 900#, 1500#, 2500# |
| Size Range | ½” to 48” (DN15 – DN1200) |
| Dimensions | ASME B16.5, B16.47, DIN, EN, JIS, GOST |
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| UNS | S44000 |
| EN | X30CrMo13 / X40CrMo13 |
| DIN | 1.4109 / 1.4125 |
| JIS | SUS440A / SUS440B / SUS440C |
| BS | 440S15 / 440S17 |
Available Sizes
Flanges: ½” NB to 48” NB
Forged Fittings: ⅛” to 4”
Custom sizes available as per design or project specifications
Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.60 – 0.75 |
| Manganese (Mn) | 1.00 max |
| Silicon (Si) | 1.00 max |
| Phosphorus (P) | 0.040 max |
| Sulfur (S) | 0.030 max |
| Chromium (Cr) | 16.00 – 18.00 |
| Molybdenum (Mo) | 0.75 max |
| Nickel (Ni) | 0.75 max |
| Iron (Fe) | Balance |
Mechanical Properties
| Property | Unit | Value |
|---|---|---|
| Tensile Strength | MPa | 760 min |
| Yield Strength (0.2% Proof) | MPa | 450 min |
| Elongation | % | 14 min |
| Hardness (Annealed) | BHN | 217 max |
| Hardness (Hardened) | BHN | 500 max |
| Impact Toughness | J | 25 (typical) |
Physical Properties
| Property | Unit | Value |
|---|---|---|
| Density | g/cm³ | 7.75 |
| Melting Point | °C | 1480 – 1520 |
| Thermal Conductivity | W/m·K | 24.0 |
| Electrical Resistivity | µΩ·m | 0.65 |
| Modulus of Elasticity | GPa | 200 |
Corrosion Resistance
ASTM A182 F440 stainless steel provides excellent resistance to corrosion in oxidizing environments, steam, hot gases, and mild acids. The high chromium content forms a stable oxide film, offering superior protection against scaling, oxidation, and pitting. However, it is less resistant to reducing acids and chloride attack compared to austenitic grades.
Heat Resistance
F440 offers outstanding scaling resistance up to 1100°C (2010°F), maintaining both oxidation protection and mechanical stability. This makes it ideal for furnace parts, heat exchangers, and other high-temperature applications.
Heat Treatment
Annealing: 850–900°C (1560–1650°F), air cool.
Hardening: 1010–1065°C (1850–1950°F), followed by oil or air quenching.
Tempering: 150–370°C (300–700°F) depending on desired hardness.
Proper heat treatment improves mechanical strength, toughness, and corrosion resistance.
Welding
ASTM A182 F440 can be welded using TIG, MIG, and shielded metal arc welding methods with preheating (200–300°C) and post-weld tempering to minimize cracking. Filler metals such as AWS E410NiMo or E420 are recommended to maintain weld integrity.
Fabrication
This grade can be machined and forged easily in the annealed condition. Forging should be carried out between 950°C and 1200°C, followed by slow air cooling. Machined components should be polished or passivated for improved corrosion resistance.
Applications
Furnace and Heat Exchanger Components
Steam Turbine Parts
Pump and Valve Components
Petrochemical Equipment
Power Generation Systems
Cutting Tools and Blades
Automotive and Aerospace Components
High-Temperature Shafts and Fasteners