ASTM A182 F446
ASTM A182 F446 Stainless Steel Flanges
ASTM A182 F446 is a high-strength ferritic-austenitic (duplex) stainless steel grade primarily used for manufacturing forged flanges, fittings, valves, and other high-performance components. It combines excellent resistance to corrosion, good mechanical strength, and superior toughness at elevated temperatures.
At Emirerri Steel, we supply and manufacture ASTM A182 F446 stainless steel flanges in various pressure ratings and dimensions, ensuring durability, precise machining, and reliable performance in aggressive environments such as chemical processing, marine engineering, and heat exchangers.
Key Features
Excellent corrosion and oxidation resistance
High mechanical strength and ductility
Superior resistance to pitting and crevice corrosion
Good stress corrosion cracking resistance
Maintains strength at elevated temperatures
Excellent fabrication and welding properties
Type of Flanges
Specification
| Specification | Details |
|---|---|
| Standard | ASTM A182 / ASME SA182 |
| Grade | F446 |
| Material Type | Ferritic-Austenitic Stainless Steel (Duplex) |
| Manufacturing Process | Forged / Rolled |
| Form | 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 | S44600 |
| EN | X3CrTi17 |
| DIN | 1.4762 |
| JIS | SUS446 |
| BS | 446S25 |
Available Sizes
Flanges: ½” NB to 48” NB
Forged Fittings: ⅛” to 4”
Custom sizes available on request
ASTM A182 F446 Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.20 max |
| Manganese (Mn) | 1.50 max |
| Silicon (Si) | 1.00 max |
| Phosphorus (P) | 0.040 max |
| Sulfur (S) | 0.030 max |
| Chromium (Cr) | 23.0 – 27.0 |
| Molybdenum (Mo) | 0.75 max |
| Nickel (Ni) | 0.25 max |
| Titanium (Ti) | 0.25 – 0.75 |
| Iron (Fe) | Balance |
ASTM A182 F446 Mechanical Properties
| Property | Unit | Value |
|---|---|---|
| Tensile Strength | MPa | 515 min |
| Yield Strength (0.2% Proof) | MPa | 310 min |
| Elongation | % | 20 min |
| Hardness | BHN | 217 max |
ASTM A182 F446 Physical Properties
| Property | Unit | Value |
|---|---|---|
| Density | g/cm³ | 7.75 |
| Melting Point | °C | 1420 – 1510 |
| Thermal Conductivity | W/m·K | 24.0 |
| Electrical Resistivity | µΩ·m | 0.65 |
| Modulus of Elasticity | GPa | 200 |
Corrosion Resistance
ASTM A182 F446 exhibits exceptional resistance to oxidation and scaling in both oxidizing and reducing environments. The high chromium and titanium content provide superior protection against pitting, crevice corrosion, and intergranular attack, even under high-temperature and chloride-bearing conditions.
Heat Resistance
The alloy provides excellent resistance to scaling and maintains mechanical strength at temperatures up to 1100°C (2010°F). It performs well in applications involving thermal cycling and exposure to corrosive gases.
Heat Treatment
ASTM A182 F446 should be annealed at 800–900°C (1470–1650°F) followed by air cooling. This treatment enhances corrosion resistance and mechanical strength. Overheating should be avoided to prevent carbide precipitation.
Welding
This grade can be welded using most fusion and resistance welding methods, though preheating to around 150–200°C is recommended to minimize thermal stress. Post-weld heat treatment can improve corrosion resistance.
Fabrication
ASTM A182 F446 stainless steel can be easily machined, forged, or fabricated into complex shapes. Forging temperature is typically 950–1200°C, and it should be finished at the lower end of this range to maintain structural integrity.
Applications
Chemical Processing Equipment
Heat Exchangers
Petrochemical Industry
Marine Engineering
Power Generation Systems
Valves, Flanges & Fittings
High-Temperature Gas Turbine Parts
Pulp & Paper Industry Components