ASTM A182 F904L
ASTM A182 F904L Stainless Steel Flange
ASTM A182 F904L stainless steel flange is a highly versatile and widely used component in industrial applications, particularly in industries requiring excellent corrosion resistance, heat resistance, and mechanical strength. This flange is manufactured from stainless steel grade 304, which is known for its exceptional properties and reliability.
Specification:
- Grade: ASTM A182 F904L Stainless Steel
- Standard: ASTM A182/A182M
- Type: Austenitic Stainless Steel
- Form: Flanges (Slip-on Flange, Weld Neck Flange, Blind Flange, Socket Weld Flange, Threaded Flange, Lap Joint Flange, Plate Flange)
- Size: Available in various dimensions (½”, ¾”, 1”, 1 ¼”, 1 ½”, 2”, 2 ½”, 3”, 4”, 5”, 6”, 8”, 10”, 12”, 14”, 16”, 18”, 20”, 24”, 26”, 28”, 30”, 32”, 34”, 36”, 38”, 40”, 42”, 44”, 46”, 48”)
- Pressure Class: 150, 300, 600, 800, 900, 1500, 2500
- End Types: Flanged, Threaded, Welded
Type of Flanges
ASTM A182 F904L Chemical Composition:
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤0.08 |
| Manganese (Mn) | ≤2.00 |
| Silicon (Si) | ≤1.00 |
| Phosphorus (P) | ≤0.045 |
| Sulfur (S) | ≤0.030 |
| Chromium (Cr) | 18.0-20.0 |
| Nickel (Ni) | 8.0-10.5 |
| Nitrogen (N) | ≤0.10 |
| Iron (Fe) | Balance |
ASTM A182 F904L Mechanical Properties:
| Property | Value |
|---|---|
| Tensile Strength | ≥450 MPa |
| Yield Strength | ≥205 MPa |
| Elongation | ≥40% |
| Hardness (Brinell) | ≥180 HB |
ASTM A182 F904L Physical Properties:
| Property | Value |
|---|---|
| Density | 8.0 g/cm³ |
| Melting Point | 1400-1450°C |
| Thermal Conductivity | 16.2 W/m-K |
| Specific Heat Capacity | 500 J/kg-K |
| Electrical Resistivity | 0.072 Ω-mm²/m |
Possible Alternative Grades Table:
| Grade | Features |
|---|---|
| ASTM A182 F904L | Higher corrosion resistance, especially to chlorides |
| ASTM A182 F904LL | Lower carbon content, improved weldability |
| ASTM A182 F904L | Stabilized with titanium for high-temperature strength |
Chemical Formula:
The approximate chemical formula for stainless steel grade 304 is Fe-Cr18-Ni10.
Grade Specification Comparison Table:
| Property | F304 | F304L | F316 |
|---|---|---|---|
| Carbon Content (%) | ≤0.08 | ≤0.03 | ≤0.08 |
| Corrosion Resistance | High | High | Higher |
| Weldability | Good | Excellent | Good |
Corrosion Resistance:
ASTM A182 F904L flanges exhibit excellent resistance to corrosion in a wide range of environments, including:
- Atmospheric conditions
- Mildly oxidizing and reducing environments
- Acids such as nitric acid and acetic acid
Heat Resistance:
The grade demonstrates good oxidation resistance in intermittent service up to 870°C and in continuous service up to 925°C. However, it is not recommended for environments with severe carburizing or reducing conditions.
Heat Treatment:
- Solution Annealing: Heat to 1010-1120°C and cool rapidly.
- Hardening: This grade cannot be hardened by heat treatment; only cold working can increase hardness.
Welding:
ASTM A182 F904L flanges have excellent weldability and are compatible with various welding methods such as TIG, MIG, and resistance welding. Post-weld annealing is generally not required unless the application is particularly corrosive.
Fabrication:
This grade is easy to fabricate using standard machining and forming techniques. Its high ductility and toughness make it suitable for processes like bending, cutting, and drilling.
Applications:
ASTM A182 F904L stainless steel flanges are widely used in various industries, including:
- Oil & Gas: For pipelines and pressure vessels
- Chemical Processing: Corrosion-resistant fittings and valves
- Power Plants: High-temperature applications
- Food & Beverage: Hygienic and safe handling equipment
- Pharmaceutical: Sterile environments
- Marine: Resistance to saltwater environments