ASTM A182 F22 UNS K21590 Blind RF Flange For Power Plant Boilers
ASTM A182 F22 Blind RF Flange
ASTM A182 F22 Blind RF Flange is ideal for high temperature and high pressure systems. Its chromium-molybdenum alloy composition provides excellent resistance to oxidation and creep.
Chromium-molybdenum alloy steel (UNS K21590) is suitable for high temperature and high pressure environments (such as power plant boilers and petrochemical equipment).
Blind flanges are used to close the end of the pipe to prevent the flow of media. They are commonly used in system isolation or future expansion interfaces.
Raised face flanges are used with gaskets (such as spiral wound gaskets) to achieve sealing. The raised face height is usually 1/16 inch (150-300 Class) or 1/4 inch (600-2500 Class).
Material & Grade :
| Alloy Steel: Grade : WP 1, WP 5, WP 9, WP 11, WP 12, WP 22, WP 91 |
Chemical Composition :
| Grade | C | Mn | Si | P | S | Cr | Mo |
| Alloy Steel F22 | 0.50.15 max | 0.3-0.6 | 0.5 | 0.03 | 0.03 | 4-6 | 0.44-0.65 |
Mechanical Properties :
| Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 205 | 415 | 20 % |
Application
High temperature and high pressure system:
Power station boiler (≤593°C), steam pipeline.
Refinery hydrogenation reactor, high temperature heat exchanger.
Pressure vessel head: used as a manhole or inspection port blind plate.
Pipeline isolation: close the pipeline during maintenance to prevent medium leakage.
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