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Alloy Steel A182 F91 Flanges are high-performance forged fittings designed for use in high-temperature and high-pressure applications. Manufactured from ASTM A182 F91 alloy steel, these flanges provide excellent resistance to corrosion, heat, and mechanical stress, making them ideal for industrial piping systems.
The A182 F91 material is a chromium-molybdenum alloy steel, offering superior strength and durability compared to carbon steel. The alloy typically contains chromium (0.5-1.25%), molybdenum (0.44-0.65%), carbon (0.05-0.15%), and other trace elements to enhance hardness and toughness.
Alloy Steel A182 F91 Flanges are available in various types, including weld neck flanges, slip-on flanges, socket weld flanges, blind flanges, threaded flanges, and lap joint flanges. Each type serves specific purposes in industrial piping, from easy assembly to pressure-tight connections.
These flanges are manufactured according to ASTM A182, ASME B16.5, and ANSI standards. They come in different pressure ratings (150, 300, 600, 900, 1500, and 2500 lbs) and sizes ranging from 1/2 inch to 48 inches, providing versatility for different piping systems.
Alloy Steel A182 F91 Flanges exhibit excellent mechanical properties, including high tensile strength, yield strength, and impact resistance. Typical tensile strength ranges from 550–750 MPa, while yield strength is approximately 250–450 MPa, ensuring reliable performance under heavy loads.
The chromium and molybdenum content provides outstanding resistance to oxidation and corrosion in high-temperature environments. This makes A182 F91 flanges suitable for applications in power plants, petrochemical industries, and refineries where high temperatures and pressures are common.
These flanges are widely used in the oil and gas sector, chemical plants, steam power plants, and industrial piping systems. They are ideal for handling high-pressure steam, water, oil, and other industrial fluids, ensuring safety and longevity in critical operations.
Alloy Steel A182 F91 Flanges are produced through advanced forging techniques followed by heat treatment. This process improves the microstructure, toughness, and dimensional accuracy of the flanges. Surface finishing and precision machining ensure proper fit and leak-proof connections.
Key advantages include high strength, durability, excellent heat and corrosion resistance, and compatibility with high-pressure systems. Their robust design reduces maintenance costs and enhances the safety of piping systems in industrial setups.
Specification Table
| Standard | Grade | Material Type | Size Range | Pressure Rating | Temperature Range | End Connection |
|---|---|---|---|---|---|---|
| ASTM A182 | F91 | Alloy Steel | 1/2" to 48" | Class 150, 300, 600, 900, 1500, 2500 | -29°C to 600°C (-20°F to 1112°F) | Weld Neck, Slip-On, Socket Weld, Threaded, Blind |
Mechanical Properties (Typical)
| Property | Value |
|---|---|
| Tensile Strength | 585 – 740 MPa (85 – 107 ksi) |
| Yield Strength | 415 MPa min (60 ksi min) |
| Elongation (in 50mm) | 20% min |
| Hardness | 207 – 241 HB |
| Impact Strength (Charpy V-Notch) | 41 J at -29°C (-20°F) |
| Modulus of Elasticity | 200 GPa (29,000 ksi) |
| Poisson's Ratio | 0.3 |
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| ASTM A182 | F91 |
| EN / DIN | 1.4903 / X10CrMoVNb9-1 |
| JIS | SCM440 |
| UNS | K91541 |
| GB / China | 20CrMoV9-1 |
| IS / India | 20CrMoV9-1 |
Dimension & Weight Chart (Selected common sizes)
Below is a representative chart showing outside diameter, wall thickness, inside diameter, cross-sectional area of metal and calculated weight per metre (kg/m). Values are calculated using density = 7.93 g/cm³ and are for guidance — use actual MTC values for procurement & engineering.
| Nominal Size (NPS) | Outside Diameter (OD) | Thickness (T) | Bolt Circle Diameter (BCD) | Number of Holes | Hole Diameter | Weight (kg) |
|---|---|---|---|---|---|---|
| 1/2" | 95 mm | 16 mm | 70 mm | 4 | 18 mm | 1.5 |
| 1" | 120 mm | 18 mm | 85 mm | 4 | 18 mm | 2.5 |
| 2" | 150 mm | 20 mm | 110 mm | 4 | 18 mm | 4.2 |
| 4" | 230 mm | 22 mm | 190 mm | 8 | 22 mm | 10.5 |
| 6" | 295 mm | 24 mm | 250 mm | 8 | 22 mm | 17.5 |
| 8" | 355 mm | 26 mm | 310 mm | 8 | 22 mm | 27.5 |
| 12" | 445 mm | 30 mm | 380 mm | 12 | 26 mm | 55.0 |
| 16" | 580 mm | 34 mm | 485 mm | 12 | 26 mm | 95.0 |
| 24" | 710 mm | 38 mm | 610 mm | 16 | 30 mm | 180.0 |
Common Types Of Flangess
Ring Flanges
Type of Flanges
General Flanges
Stainless Steel Pipe Flanges
ASME B16.5 Flanges
Stainless Steel Flanges
Frequently Asked Questions (FAQ)
What are Alloy Steel A182 F91 Flanges?
Alloy Steel A182 F91 Flanges are high-strength steel flanges designed for high-temperature and high-pressure applications. They are widely used in power plants, refineries, and chemical industries due to their excellent mechanical properties and corrosion resistance.
What materials are used in ASTM A182 F91 Flanges?
These flanges are made from chromium-molybdenum-vanadium alloy steel, which provides superior strength, high temperature resistance, and durability in demanding environments.
What types of flanges are available in ASTM A182 F91?
Common types include Weld Neck Flanges, Slip-On Flanges, Socket Weld Flanges, Blind Flanges, Threaded Flanges, and Lap Joint Flanges, available in various sizes and pressure classes.
What is the temperature range of A182 F91 Flanges?
These flanges can typically operate in temperatures ranging from -29°C to 600°C (-20°F to 1112°F), making them suitable for high-temperature applications.
What are the international equivalents of A182 F91 Flanges?
International equivalents include EN/DIN 1.4903 (X10CrMoVNb9-1), JIS SCM440, UNS K91541, GB 20CrMoV9-1, and IS 20CrMoV9-1.
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