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Butt welded steel pipe flange with neck
Butt welded steel pipe flange with neck

Butt welded steel pipe flange with neck

Butt-welded steel pipe flange with neck refers to a flange with a cone neck and butt welding with the barrel or...
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Butt-welded steel pipe flange with neck refers to a flange with cone neck and butt welding with the barrel or pipe. It is an integral flange.

Due to the transition structure of cone neck and butt welding connection, the strength and stiffness of flange are strengthened, and the sealing property is better than that of plain welding flange. The disadvantage is to use forgings manufacturing, cost more materials, manufacturing costs. Suitable for high pressure, high temperature or high sealing requirements.

Butt welding flange is a kind of pipe fitting, it refers to the flange with neck and circular pipe transition and butt welding connection with the pipe. Butt welding flange is not easy to deformation, good sealing, widely used, there are corresponding rigid and elastic requirements and reasonable butt welding thin transition, welding from the welding surface distance, welding surface from welding temperature deformation.

Scope of application:

With neck butt welding steel pipe flange is not easy to deformation, good sealing, wide application, have corresponding rigid and elastic demand and reasonable butt thinning transition, joint good distance away from the joint face the faying surface from welding deformation temperature, it take more complex syndromes beep form structure, suitable for pressure or temperature fluctuations of pipeline or high temperature, high pressure and low temperature pipes, commonly used in PN is greater than 2.5 MPa pipe and valve connection; Also used to transport expensive, flammable, explosive medium on the pipeline.

Technical requirements for butt welded steel pipe flange with neck:

1. The level and technical requirements of butt welding flange shall meet the corresponding requirements of jb4726-4728.

1, the nominal pressure PN 0.25 MP 1.0 MPa carbon steel and austenitic stainless steel forgings allowed the use of level Ⅰ forgings. 2, in addition to the following provisions, nominal pressure of PN 1.6 MPa to 6.3 MPa forgings shall conform to Ⅱ level or above level Ⅱ forgings levels. 3, conform to one of the following situations, should accord with the requirement of Ⅲ and forgings: (1) the nominal pressure PN acuity 10.0 MPa flange forging; (2) nominal pressure; 4.0MPa chrome molybdenum steel forgings; (3) nominal pressure; 1.6MPa ferritic steel forgings with operating temperature ≤-20 ℃.

Two, with neck butt welding steel pipe flange is generally made of forging or forging rolling process. When using steel plates or sections, the following requirements shall be met:

1, welding flange should be ultrasonic testing, no layered defects; 2, should be cut along the rolling direction of steel into strips, through bending butt welding into a ring, and the surface of steel to form a ring of cylinder. The steel plate shall not be directly machined into butt welding flange with neck; 3. Full penetration weld shall be adopted for the butt weld of the ring; 4. The butt welding seam of the ring shall be subjected to post-welding heat treatment and shall be subject to 100% radiographic or ultrasonic inspection, and the radiographic inspection shall meet the grade II requirements of JB4730, and the ultrasonic inspection shall meet the grade I requirements of JB4730.

Three, welding flange neck lateral slope should not be greater than 7o. Welding flange in production and welding strict control of technical parameters, to ensure that the production and use of full play and value.