ASTM A182 / ASME SA182 F60 UNS32205 Slip On Flanges Duplex Steel Flanges B16.5
The Spectacle Blind Flange is a special pipe fitting mainly used in industrial piping systems. It consists of two parts: a flange with holes (which can be connected to the pipe) and a solid plate (also called a blind plate or plugging plate) used with it. The two parts are connected together by bolts and nuts.
The main advantages of this design are its flexibility and convenience. When the pipeline needs to be cleaned, repaired or temporarily closed, the solid plate can be removed by removing the bolts, and then reinstalled after the corresponding work is completed. Compared with permanent welding or other fixing methods, the use of eight-character blind flanges is more convenient and quick, and it is also convenient for possible future operational adjustments.
In practical applications, Spectacle Blind Flange usually refers to the design shape of this type of blind flange, which is similar to the Chinese character "eight", that is, narrow in the middle and wide at both ends. Such a structure is conducive to improving sealing performance and can meet the connection requirements between pipes of different sizes to a certain extent.
What is the difference between F60 and other alloy steel grades?
It has excellent corrosion resistance and strength characteristics, better local corrosion resistance, and is widely used as a material for chemical equipment. Compared with 316L and 317L austenitic stainless steel, 2205 alloy is superior in resistance to pitting corrosion and corrosion. It has high corrosion resistance. Compared with austenite, it has a lower thermal expansion coefficient and higher thermal conductivity.
What is the temperature range of Alloy Steel A182 F60 Flanges?
UNS S31803/S32205 heat treatment process: The solution treatment temperature is 1020~1100℃, and rapid cooling is required after heat treatment. The cooling speed should be as fast as possible, and the time exposed to the brittle temperature range (475℃ brittle temperature range, 0 brittle temperature range) must be shortened.
Chemical composition % of ASTM A182 F60 flanges
| Chemical Composition Limits |
| Weight% | C | Mn | P | S | Si | Cr | Ni | Mo | N |
| Duplex F60 | 0.03 max | 2.0 max | 0.03 max | 0.02 max | 1 max | 21-23 | 4.5-6.5 | 2.5-3.5 | 0.80-0.20 |
Mechanical properties of ASTM A182 F60 flanges
| Alloy | Tensile Strength N/mm² | Proof Strength 0.2% N/mm² | Elongation (%) | Hardness Brinell |
| F60 | 95 | 50 | 35 | 170-255 |
Application
1. Isolation and cut-off: When a section of the pipeline needs to be temporarily closed for maintenance, cleaning or equipment replacement, the eight-shaped blind flange can be used to quickly isolate and cut off the flow of fluid. Its unique structure allows workers to easily install or remove it without completely dismantling the entire pipeline system.
2. Testing and debugging: New or renovated pipeline systems usually need to undergo pressure testing and other inspection processes before they are officially put into use. At this time, certain ports can be closed by installing eight-shaped blind flanges to facilitate pressure testing of specific areas to ensure that the sealing and safety of the system meet the requirements.
3. Flexible switching: For companies that may frequently adjust process flows according to production needs, eight-shaped blind flanges provide a simple way to change the direction of material flow. Simply rotating the blind plate position can achieve the conversion between the open/closed state, greatly improving operational efficiency.
4. Safety protection: When some important devices are temporarily not in use but cannot be completely disconnected (such as standby pumps), eight-shaped blind flanges can be set at the corresponding positions as physical barriers to prevent accidental leakage or other safety hazards.
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ASTM A182 / ASME SA182 F60 Duplex Steel Spectacle Blind Flange B16.5 B16.47 Images
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