ASTM A182 F11 Alloy Steel Flange
ASTM A182 F11 Specification:
- Material Grade: A182 F91
- Standard: ASTM A182/A182M
- Type: Low Alloy Steel
- Form: Slip-on Flange, Weld Neck Flange, Blind Flange, Socket Weld Flange, Threaded Flange, Lap Joint Flange, Plate Flange
- Size: 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 F11 Equivalent Material:
- AISI/SAE: 1.4903
- UNS: K90901
- JIS (Japan): SCMV9
- DIN (Germany): X10CrMoVNb9-1
- EN (Europe): X10CrMoVNb9-1 (EN 10216-2)
- BS (British Standard): 621B
- AFNOR (France): Z10CDVNb9-1
- UNI (Italy): X10CrMoVNb9-1
- SS (Sweden): Not commonly listed
- GB (China): 10Cr9Mo1VNb
ASTM A182 F11 Chemical Composition:
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.08 - 0.15 |
| Manganese (Mn) | 0.30 - 0.60 |
| Silicon (Si) | 0.50 - 0.80 |
| Chromium (Cr) | 4.00 - 6.00 |
| Molybdenum (Mo) | 0.85 - 1.05 |
| Vanadium (V) | 0.20 - 0.25 |
| Phosphorus (P) | ≤ 0.020 |
| Sulfur (S) | ≤ 0.010 |
| Nickel (Ni) | ≤ 0.50 |
| Copper (Cu) | ≤ 0.25 |
ASTM A182 F11 Mechanical Properties:
| Property | Value |
|---|---|
| Yield Strength (min) | 205 MPa (30 ksi) |
| Ultimate Tensile Strength (min) | 415 MPa (60 ksi) |
| Elongation at Break | ≥ 20% |
| Hardness (Rockwell B) | ≤ 95 |
ASTM A182 F11 Physical Properties:
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting Point | 1,430 - 1,510°C |
| Thermal Conductivity | 32 W/m·K |
| Specific Heat Capacity | 460 J/kg·K |
Possible Alternative Grades Table:
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting Point | 1,430 - 1,510°C |
| Thermal Conductivity | 32 W/m·K |
| Specific Heat Capacity | 460 J/kg·K |
Chemical Formula:
The chemical formula for ASTM A182 F11 can be represented as:
Fe+C+Cr+Mo+V+Ni+Mn+SiThis formula indicates the presence of iron (Fe) as the base element, combined with chromium (Cr), molybdenum (Mo), vanadium (V), and other alloying elements to enhance high-temperature strength, corrosion resistance, and toughness.
Grade Specification Comparison Table:
| Specification | ASTM A182 F11 | ASTM A182 F22 | ASTM A335 P91 |
|---|---|---|---|
| Yield Strength (MPa) | 205 | 205 | 205 |
| Tensile Strength (MPa) | 415 | 415 | 415 |
| Chromium (%) | 4.00 - 6.00 | 2.00 - 2.50 | 5.00 - 5.50 |
| Molybdenum (%) | 0.85 - 1.05 | 1.00 - 1.50 | 0.90 - 1.10 |
| Vanadium (%) | 0.20 - 0.25 | 0.20 - 0.30 | 0.18 - 0.30 |
Corrosion Resistance:
ASTM A182 F11 alloy steel flanges have good resistance to general corrosion, although they are not suitable for extremely corrosive environments without additional protection. They perform well in steam, water, and some chemical solutions. However, additional coatings or surface treatments may be needed for highly corrosive environments.
Heat Resistance:
F91 flanges are particularly known for their ability to withstand high temperatures (up to 650°C/1200°F) without losing their mechanical properties. This makes them ideal for applications in power plants, refineries, and other high-heat industries.
Heat Treatment:
The heat treatment process for ASTM A182 F11 alloy steel includes:
- Annealing: Heating to 870 - 900°C (1600 - 1650°F) followed by slow cooling.
- Normalizing: Heating to 950 - 1000°C (1750 - 1830°F) followed by air cooling.
- Tempering: After quenching, tempering at 760 - 790°C (1400 - 1450°F) improves toughness.
Welding:
Welding of ASTM A182 F11 alloy steel requires preheating and post-weld heat treatment (PWHT) to avoid cracking and to maintain the integrity of the material under high-stress conditions. The most common welding methods include TIG (Tungsten Inert Gas) and MIG (Metal Inert Gas) welding. Filler materials such as ER90S-B9 are typically used for welding F91 alloy steel.
Fabrication:
ASTM A182 F11 flanges can be fabricated using conventional machining methods like turning, milling, and drilling. However, as the material is highly resistant to deformation, specialized equipment may be required to achieve precise dimensions.
Applications:
F91 alloy steel flanges are widely used in industries that require high strength and durability under extreme conditions, including:
- Power generation (steam turbines, boilers, etc.)
- Petrochemical plants (high-pressure reactors)
- Oil & gas refineries
- Chemical processing industries
- Cement plants
- Marine engineering