ASTM A182 Grade F11 CL2 Blind Flange Alloy Steel Flange BLRF Flange for Oil and Gas Industry
ASTM A182 Grade F11 Class 2 Blind Flange Forged Alloy Steel Flange BLRF Flange Black Paint
ASTM A182 Grade F11 Class 2 Blind Flange is a solid, disc-shaped pipe flange, manufactured via the forging process, designed to seal the end of a piping system or pressure vessel opening. It is produced in compliance with ASTM A182, the standard specification for forged or rolled alloy-steel pipe flanges, forged fittings, and valves for high-temperature service.
This flange is predominantly used in high-temperature and high-pressure environments across the oil and gas, petrochemical, power generation, and refinery industries. Typical working temperatures range up to 550°C (1022°F), with pressure ratings commonly specified for Class 150, 300, 600, 900, 1500, or 2500 (based on ASME B16.5 or ASME B16.47), depending on the flange dimensions.
Equivalent Grade of ASTM A182 Grade F11 CL2 Blind Flange Forged Alloy Steel Flange BLRF Flange
| Common Name | Type | UNS | Forging Spec. | Casting Spec. Equivalent | DIN |
|---|---|---|---|---|---|
| 1.25Cr-0.5Mo | K11572 | A182 F11 cl2 | A217 WC6 | 13CRM044 | 1.7335 |
Chemical Composition % of ASTM A182 Grade F11 CL2 Blind Flange Forged Alloy Steel Flange BLRF Flange
| Grade | C | Mn | Si | S | P | Cr | Mo |
| ASTM A182 F11 Flange | 0.05 - 0.15 | 0.3 - 0.6 | 0.5 - 1 | 0.03 | 0.03 | 1 - 1.5 | 0.044 - 0.65 |
Mechanical Properties of ASTM A182 Grade F11 CL2 Blind Flange Forged Alloy Steel Flange BLRF Flange
| Mechanical Properties | Original Value | Comments |
|---|---|---|
| Hardness, Brinell | 143 - 207 | |
| Tensile Strength, Ultimate | 485 MPa | |
| Tensile Strength, Yield | 275 MPa | |
| Elongation at Break | 20 % | in 2 in. (50 mm) |
| Reduction of Area | >= 30 % |
Manufacturing Process (Forging)
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Billet Cutting: Alloy steel round billets are cut to weight.
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Heating: Inductively or gas-heated to forging temperature (~1100°C - 1200°C).
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Forging: Hot forged using hammer forging, press forging, or ring rolling to refine the grain structure and eliminate porosity.
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Rough Machining: Performed to remove scale and create a basic shape.
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Heat Treatment: Q&T as per CL2 requirements.
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Finish Machining: Precise CNC machining of the raised face, bolt holes, and back face.
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Testing: NDT (Ultrasonic, Magnetic Particle) as per customer requirements.
Choose ASTM A182 F11 CL2 BLRF Flange when your design conditions require:
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Operating Temperature: 400°C to 550°C (752°F to 1022°F).
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Operating Pressure: Moderate to High (ASME Class 300 to 2500).
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Medium: Hydrocarbons, high-pressure steam, hydrogen-rich syngas, or hot process oils.
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Critical Requirement: The flange must withstand repeated thermal cycling without failing by creep or fatigue, demanding the higher strength guaranteed only by the CL2 heat treatment.
Applications
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Oil & Gas (Upstream and Downstream)
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Petrochemical & Chemical Plants
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Power Generation (Boiler components, steam lines)
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Refinery piping systems (Hydrocracking, catalytic reforming).
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