ASTM A182 F904L Flange Specifications
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ASTM A182 F904L stainless steel flanges are high-alloy, low-carbon austenitic flanges designed for aggressive corrosion environments such as seawater, chemical processing, and high-chloride applications. This article outlines the key specifications, chemical composition, mechanical properties, and answers commonly asked questions to help you better understand F904L flanges for industrial use.
What is ASTM A182 F904L?
ASTM A182 F904L is a low carbon, high alloy austenitic stainless steel with excellent corrosion resistance in a wide range of aggressive media. It is widely used in flanges, valves, and pressure vessel components in industries like oil & gas, chemical processing, marine, and pharmaceutical.
ASTM A182 F904L Flange Specifications
| Specification | Details |
|---|---|
| Standard | ASTM A182 / ASME SA182 |
| Grade | F904L (UNS N08904) |
| Flange Types | Weld Neck, Slip-On, Blind, Socket Weld, Threaded |
| Size Range | ½" to 48" (DN15–DN1200) |
| Pressure Class | Class 150, 300, 600, 900, 1500, 2500 |
| Facing Types | RF, FF, RTJ |
| Heat Treatment | Solution Annealed |
| Tolerance Standard | ASME B16.5 / B16.47 |
| Surface Finish | Machined, mirror-polished, or custom on request |
Chemical Composition of ASTM A182 F904L (%):
| Element | Min (%) | Max (%) |
|---|---|---|
| C | – | 0.020 |
| Cr | 19.0 | 23.0 |
| Ni | 23.0 | 28.0 |
| Mo | 4.0 | 5.0 |
| Cu | 1.0 | 2.0 |
| Mn | – | 2.0 |
| Si | – | 1.0 |
| S | – | 0.035 |
| Fe | Balance |
Mechanical Properties of ASTM A182 F904L:
Tensile Strength: ≥ 490 MPa
Yield Strength (0.2% offset): ≥ 220 MPa
Elongation: ≥ 35%
Hardness (Brinell): ≤ 220 HBW
What is the difference between F904L and 316L flanges?
F904L offers superior corrosion resistance, especially against chloride stress corrosion and sulfuric acid, while 316L is better for general-purpose applications.
Is F904L flange suitable for seawater?
Yes, its high nickel and molybdenum content provide outstanding resistance to seawater and marine atmospheres.
What is the temperature limit for F904L flanges?
Typically suitable for continuous service up to 400°C (752°F) in corrosive environments.
Can F904L flanges be welded easily?
A: Yes, it is weldable with conventional methods using matching filler materials like ER385 or AWS A5.9.
Why Choose GNEE for F904L Flanges?
Wide inventory of ASTM A182 F904L flanges in multiple sizes and pressure ratings
Custom machining, drilling, surface finish, and NDT services available
Third-party inspection (TUV, SGS, BV) and material test certificates (MTC EN 10204 3.1/3.2)
Global shipping and reliable lead time
