Butt welding flange is a kind of pipe fitting, which refers to a flange with a neck and a round tube transition and connected to the pipe by butt welding. Butt welding flange is not easy to deform, has good sealing, is widely used, has corresponding rigidity and elasticity requirements and reasonable butt welding thinning transition, the distance between the weld and the joint surface is large, and the joint surface is free from welding temperature deformation. It adopts a relatively complex trumpet-shaped structure and is suitable for pipelines with large fluctuations in pressure or temperature or high-temperature, high-pressure and low-temperature pipelines. It is generally used for the connection of pipelines and valves with PN greater than 2.5MPa; it is also used on pipelines that transport expensive, flammable and explosive media.

Common production standards:

Ministry of Chemical Industry Standards: HG/T20592-2009, HG/T20615-2009,

National Standards: GB/T9115.1-2000, GB/T9115.2-2000, GB/T9115.3-2000, GB/T9115.4-2000,

Ministry of Machinery Standards: JB/T86.2-94,

Marine Standards: CB/T47-1999

The model range of butt welding flange includes 4 to 48 bolt holes, threads from M10 to M27, and flange outer diameters from 75mm to 2190mm.

The materials of butt welding flanges include cast steel, carbon steel, stainless steel, alloy steel and forged steel. The selection of these materials is based on their respective advantages and applicability to meet different engineering requirements. Specifically:

Cast steel: has good plasticity and strength, suitable for applications requiring higher strength and corrosion resistance.

Carbon steel: economical, has good mechanical properties, suitable for general industrial piping systems.

Stainless steel: It has excellent corrosion resistance and is suitable for conveying expensive, flammable, and explosive media, such as oil and natural gas.

Alloy steel: It has high strength and good corrosion resistance and is suitable for high-temperature, high-pressure, and low-temperature pipeline systems.

Forged steel: It has good toughness and machinability and is suitable for applications that require high strength and impact resistance.

The selection of butt-weld flanges is not only based on the material, but also takes into account the specific requirements of the pipeline system, such as pressure, temperature range, medium properties, and other factors.Therefore, when selecting butt-weld flanges, these factors need to be considered comprehensively to ensure the safe and reliable operation of the pipeline system.

The application scenarios of butt welding flanges are very wide, mainly used in petrochemical, electricity, gas, transportation and other industries. ‌

Petrochemical industry: Butt welding flanges are widely used in pipeline systems in the fields of oil refining, fertilizers, coatings, paints, chemical fibers, etc. ‌

Electric power industry: In the power production process such as thermal power generation and nuclear power, butt welding flanges are used to connect and fix pipelines to ensure the stable operation of the system. ‌

Gas industry: Butt welding flanges are also widely used in the transmission pipeline system of natural gas and city gas to ensure the transmission and supply of energy. ‌

Transportation industry: In the transportation process of liquefied gas tankers and petroleum tankers, butt welding flanges are used for connection and sealing to ensure safety during transportation. ‌

In addition, butt welding flanges are also suitable for boiler pressure vessels, pharmaceuticals, metallurgy, machinery, food and other industries, as well as application scenarios that require frequent disassembly and replacement of pipeline connections. ‌ Its use not only improves the reliability and safety of pipeline connections, but also improves the efficiency and safety of industrial production. ‌