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Comparison of different types of steel flange fasteners


Date:

2024-02-26

Steel flange fasteners are the components used to connect steel pipe flanges, ensuring the sealing and structural integrity of piping systems. According to different standards and requirements, steel flange fasteners are divided into a variety of types, common including PN series and Class series. The following is a comparison of these two series of fasteners:

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Steel flange fasteners are the components used to connect steel pipe flanges, ensuring the sealing and structural integrity of piping systems. According to different standards and requirements, steel flange fasteners are divided into a variety of types, common including PN series and Class series. The following is a comparison of these two series of fasteners:

1. PN series fasteners:
- PN series fasteners follow the GB/T9125.1-2020 standard, which specifies the structural type, size and tolerance, material, manufacturing and heat treatment, inspection and acceptance requirements of PN series fasteners for steel pipe flanges.
- PN series includes hexagon head bolts, equal length double stud, full thread stud and nut.
- It is suitable for nominal pressure (PN) series of flanged connections, focusing on suitable for medium and low pressure systems.
PN series fasteners are usually used for occasions where the size and tolerance requirements of fasteners are not very strict.

2. Class series fasteners:
Class Series fasteners usually follow ASME B16.5 or other relevant international standards such as DIN, JIS, etc., which define the requirements for flanged joint fasteners in different pressure classes (Class 150, 300, 600, 900, 1500, etc.).
- Class Series fasteners include bolts, studs and nuts, which are designed and more demanding to adapt to different pressure and temperature conditions.
This type of fasteners are mostly used in high pressure and important industrial piping systems, which have higher requirements for safety and reliability.

When selecting steel flange fasteners, the following factors need to be considered:
- Nominal pressure (PN value or Class rating)
- Operating temperature
- Type of media
- Material of bolts and nuts (carbon steel, alloy steel, etc.)
- Environmental conditions (e.g. corrosion)
- Strength and dimensions of bolts
- Flange design and use requirements

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Key Words:

steel,flange,flanges,ASME B16.5