Alloy Steel Butt Welding Flange

Alloy butt welding flange is a common disc-shaped part in pipeline engineering, which is used for interconnection between pipes. It connects the ends of two pipes, fittings or devices by bolts, and uses gaskets in the middle for sealing. The implementation standards of alloy butt welding flanges include national standards, standards of the Ministry of Chemical Industry, standards of the Ministry of Machinery, etc. Specific types include integral flanges, threaded flanges, plate-type slip-on flanges, necked slip-on flanges, necked socket welding flanges, butt welding ring neck loose flanges, flat welding ring plate loose flanges, flanged ring plate loose flanges, etc. The material of alloy butt welding flanges can be alloys, such as INCOLOY800H/HT, which is an austenitic heat-resistant alloy widely used in high-temperature pressure-bearing structural parts. Its high strength is due to the addition of carbon, aluminum, and titanium elements, and annealing at a low temperature of 1149℃ to achieve a specific grain size.

Alloy butt welding flange, as a pipe fitting, can be made of a variety of alloy steels, which have high strength, good corrosion resistance and high pressure resistance. Alloy flanges have a variety of material choices, including low carbon steel, medium carbon steel, high carbon steel and various alloy steels. The choice of these materials makes the alloy butt welding flange have the characteristics of firm structure, small size, tight and reliable, easy operation and maintenance, pressure resistance, corrosion resistance, and excellent sealing performance, so it has a wide range of applications.

1. Dimensions and parameters: ‌

Flange outer diameter ranges from 75mm to 2190mm. ‌

The number of bolt holes ranges from 4 to 48. ‌

The bolt hole diameter is between 11mm and 30mm. ‌

Flange thickness is between 12mm and 58mm. ‌

The outer diameter of the pipe is divided into A (17.2-2032MM) and B (14-2020MM). ‌

The inner diameter of the flange is divided into A (18-2036MM) and B (15-2024MM). ‌

2. Pressure level: ‌

Including but not limited to class 150LBS, ‌300LBS, ‌600LBS, ‌900LBS, ‌1500LBS, ‌2500LBS. ‌

Pressure levels are also expressed in PN, such as PN0.6, 1.0, 1.6, 2.5, 4.0, 6.3, 10.0, 16.0, 25.0 MPa. ‌

3. Material: ‌

The materials of alloy steel flanges include but are not limited to 1Cr5Mo, 12CrMo, 12CrMoG, 12Cr1MoV, 15CrMo, 15CrMoG, etc. ‌

The materials of stainless steel flanges include 304/304L/316/316L, etc. ‌

The materials of carbon steel flanges include 20#, Q235B, 16Mn, ASTM A105/A105N, etc. ‌

4. Connection method: ‌

The butt-weld flange is usually connected to the pipeline by welding to ensure the tightness and stability of the connection. ‌

In addition, the implementation standards of alloy butt-weld flanges include national standards, chemical industry standards, machinery department standards, etc., which are suitable for different industrial application scenarios. Sealing surface types include convex surface RF, flat surface FF, ring connection surface RJ, concave and convex surface MFM, etc., to meet different sealing needs.

Alloy butt-weld flanges are used in a wide range of scenarios, including but not limited to the petrochemical industry, the power industry, the gas industry, and the transportation industry.

Petrochemical industry: Alloy butt-weld flanges play an important role in the petrochemical industry, including pipeline connections in the fields of oil refining, fertilizers, coatings, paints, chemical fibers, etc.

Power industry: In the power industry, alloy butt-weld flanges are widely used for pipeline connections in thermal power, nuclear power, and other fields.

Gas industry: Alloy butt-weld flanges are also suitable for the gas industry, such as pipeline connections in natural gas, city gas, and other fields.

Transportation industry: In the transportation industry, alloy butt-weld flanges are used for pipeline connections in transportation tools such as liquefied gas tankers and petroleum tankers.‌

The technical parameters of alloy butt welding flanges include pressure level, material, size, etc. ‌

1.Pressure level: Alloy butt welding flanges have various pressure levels, including but not limited to PN2.5; PN6; PN10; PN16; PN25; PN40; PN63; PN100; PN160; PN250; PN320; PN400, etc. These pressure levels cover pressure requirements from lower to higher, and are suitable for different industrial application scenarios. ‌

2.Material: Alloy butt welding flanges have various materials, including stainless steel, carbon steel, alloy steel, etc. These materials have good mechanical properties and corrosion resistance, and can meet the use requirements in various industrial environments. ‌

3. Size: Alloy butt welding flanges also have various sizes, including nominal diameters of DN10 to 900mm, to meet the connection requirements of different pipeline systems. ‌

In addition, alloy butt-weld flanges may also involve other technical parameters, such as connection method (welding), brand (such as Guanghao brand), and whether it can be customized. ‌In practical applications, the selection of suitable alloy butt-weld flanges needs to consider their compressive strength, safety, reliability, and compliance with specific national standards or industry standards. ‌For example, for applications that require high temperature or high pressure, a butt-weld flange made of an alloy material with higher strength and corrosion resistance may be selected.