ASTM A182 F304 Stainless Steel Flange
ASTM A182 F304 Specification:
- Grade: ASTM A182 F304 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
ASTM A182 F304 Material Properties:
ASTM A182 F304 is austenitic stainless steel, primarily composed of chromium and nickel. This combination provides outstanding corrosion resistance and durability.
ASTM A182 F304 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 F304 Mechanical Properties:
| Property | Value |
|---|---|
| Tensile Strength | ≥450 MPa |
| Yield Strength | ≥205 MPa |
| Elongation | ≥40% |
| Hardness (Brinell) | ≥180 HB |
ASTM A182 F304 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 F316 | Higher corrosion resistance, especially to chlorides |
| ASTM A182 F304L | Lower carbon content, improved weldability |
| ASTM A182 F321 | 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 F304 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 F304 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 F304 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