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ASTM A182 F1

ASTM A182 F1 Alloy Steel Flange

ASTM A182 F1 is a specification that covers forged or rolled alloy steel flanges and other parts for high-temperature, high-pressure applications. It is commonly used in industries like petrochemicals, oil & gas, power generation, and chemical processing. F91 flanges are designed to operate in environments where elevated temperatures and pressures are encountered.

ASTM A182 F1 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 F1 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 F1 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 F1 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 F1 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 F1 can be represented as:

Fe+C+Cr+Mo+V+Ni+Mn+Si

This 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 F1 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 F1 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 F1 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 F1 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 F1 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

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