Carbon steel large-diameter flange refers to a flange connection made of carbon steel material with a larger nominal diameter (DN), usually used to connect large-diameter pipelines, valves, pumps and other equipment. Here is a detailed introduction about it:

Material characteristics

The commonly used carbon steel materials include Q235, Q345, 20 #, 16Mn, etc. Among them, ASTM A105 is a common standard for carbon steel flange materials. It has the advantages of easy welding, good plasticity, strong high-temperature stability, and good toughness, and is relatively inexpensive with high cost-effectiveness.

Specifications and Dimensions

Nominal diameter: Common specifications are DN15-DN2000.

Pressure rating: The pressure rating for large-diameter flanges made of national standard carbon steel is usually PN2.5-PN100. Under the American standard ASME B16.47, the A series has five grades including Class 150, 300, 400, 600, and 900, while the B series has six grades including Class 75, 150, 300, 400, 600, and 900.

Execution standard

Common implementation standards include GB/T 9119-2010 "Flat and protruding face flat welded steel pipe flanges", GB/T 9116 "Flat and protruding face neck flat welded steel pipe flanges" and other national standards, as well as ASME B16.5, ASME B16.47 and other American standards.

Connection type

There are mainly various forms of connection, such as plate flat welding, neck flat welding, neck butt welding, socket welding, threaded connection, etc. Different connection forms are suitable for different pressure and working conditions.

Advantage

Space saving: Large flanges can adapt to greater pressure and reduce the space requirements of pipelines, making them suitable for pipeline systems with limited space but high pressure.

Reduce weight: It can share more pressure bearing coefficients of pipelines, reduce the number of small-sized flanges used, and improve the portability and operability of the system.

Good sealing performance: Through precise size and material selection, as well as appropriate sealing rings or gaskets, reliable sealing effect can be provided.

High strength and rigidity: able to maintain stable and reliable performance in harsh environments such as high pressure, high temperature, and vibration.

Easy to install and maintain: can be assembled and disassembled with specialized tools, and maintenance and replacement are also relatively convenient.

Application field

Widely used in the energy industry, such as oil, natural gas, wind power, hydropower, etc; Underground drainage systems, ventilation systems, air conditioning systems, etc. in the construction industry; And the mechanical industry, chemical industry, sewage treatment industry, etc.