ASME B16.5 A182 F12 Flange

The ASME B16.5 A182 F12 Flange is a high-temperature, high-pressure flange compliant with the ASME B16.5 standard, manufactured from ASTM A182 F12 chromium-molybdenum alloy steel. It is designed for medium-to-high temperature and high-pressure applications in petrochemical, power generation, and industrial piping systems.

High Quality ASME B16.5 A182 F12 Flange

Temperature Range: Long-term: -29°C to 550°C； Short-term: ≤600°C (oxidation rate must be evaluated)
Pressure Ratings: Class 150, 300, 600, 900, 1500, and 2500.
Size Range: NPS ½” to 24″ (compliant with ASME B16.5 standard)

ASME B16.5 ASME B16.5 A182 F12 Flange

The ASME B16.5 standard covers various flange designs, including:

Weld Neck Flange: Preferred for high-pressure systems, connected via welding.
Slip-On Flange: Easy installation, suitable for low-pressure applications.
Blind Flange: Used to seal pipe ends.
Threaded Flange: Connected via threads, eliminating the need for welding.
Lap Joint Flange: Paired with stub ends for easy disassembly.

Material Properties (ASTM A182 F12)

Chemical Composition:

Alloy Composition: 1% chromium-0.5% molybdenum (1Cr-0.5Mo)
Material Standard: ASTM A182/A182M
Material Grade: F12 (divided into F12 Class 1, Class 2, and Class 3)

Mechanical Properties:

Property	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)	Brinell Hardness (HB)
F12 Class 1/2	≥485	≥275	≥20	≤187
F12 Class 3	≥620	≥450	≥18	≤212

Advantages

High-Temperature Performance: Suitable for environments up to 550°C
Hydrogen Corrosion Resistance: Ideal for hydrogen-containing media (e.g., refinery hydroprocessing units)
Good Weldability (requires preheating and post-weld heat treatment)
Cost-Effective (more economical than F22/F91)

Typical Applications

Oil Refineries: Hydrodesulfurization units (HDS), catalytic reforming pipelines.
Chemical Equipment: Ammonia synthesis reactors, methanol synthesis towers.
Power Industry: High-pressure boiler pipelines, steam turbine connection systems.
Industrial Piping: High-temperature heat transfer oil systems, thermal conduits.

Welding & Heat Treatment Requirements

Filler Material: Low-hydrogen electrodes (e.g., E8015-B2, E8018-B2)
Preheating Temperature: 200–300°C (to prevent cold cracking)
Post-Weld Heat Treatment (PWHT): 675–705°C tempering (to relieve residual stresses)

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More Information about ASME B16.5 A182 F12 Flange

ASME B16.5 A182 F12 flange is a type of pipe flange that complies with the dimensional, design, and pressure rating requirements of the ASME B16.5 standard, while its material is of F12 grade as specified in ASTM A182. This flange is typically manufactured by forging, offering high strength along with excellent high-temperature and corrosion resistance, making it suitable for use in piping systems operating under high temperature and high pressure conditions in industries such as petroleum, chemicals, and power generation.

Pressure–Temperature Ratings for A182 Gr. F12

Working Pressures by Classes, bar

Working Pressures by Classes, psig

Working Pressures by Classes, bar

Working Pressures by Classes, psig

FAQ

What’s the difference between F12 Class 2 and Class 3?

Class 2: Standard heat treatment (normalizing + tempering), suitable for most high-temperature pipelines.
Class 3: Higher strength (yield strength ≥450 MPa), ideal for high-stress environments but more challenging to weld.

Can F12 flanges be used in sulfur-containing environments?

Not recommended. F12 has limited sulfur corrosion resistance; consider A182 F5 (5Cr-0.5Mo) or stainless steel flanges instead.

How to choose between F12 and F22 flanges?

F12 (1Cr-0.5Mo): More cost-effective, suitable for ≤550°C.
F22 (2.25Cr-1Mo): Higher temperature resistance (600°C), better hydrogen corrosion resistance, but more expensive.

For detailed dimension tables, supplier quotes, or selection advice, please provide:

Operating temperature/pressure
Media composition (e.g., sulfur, hydrogen content)
Connected piping material (e.g., P11/P12 steel pipes)

Note: F12 flanges are not suitable for strongly acidic or high-sulfur environments. Consult a professional engineer for special applications.