Carbon steel weld neck flange
Carbon steel weld neck flange includes long-neck butt welding flange, flange with neck butt welding protruding surface, butt welding products with neck, etc., it is mainly suitable for butt welding of flange and pipe, its structure is reasonable, strength and stiffness is larger, more able to withstand high temperature, high pressure and repeated twists and turns and temperature shake; And its sealing function is firm, nominal pressure 0.25~2.5MPa butt welding flange is selected concave convex sealing surface. To put it simply, butt welding flanges are flanges with necks and circular pipe transitions that are connected to butt welding of pipes.
Welding flange is a kind of flange pipe fittings, in different categories and occupations have a wide range of applications and implementation, it is used in the application of different scales, the need to use the environment is different, according to the requirements of the conditions to use. Must have skills at the beginning of butt welding flange yield and production parameters and requirement of production and use, to ensure that can be used in accordance with the method and principle of must and implementation, technology method and the principle of selection will be produced and welding, strict to ensure that in the outstanding quality of butt welding flange used in produce and strict control techniques to welding parameters, can ensure that the production and use of high function and value.
Specifications of Carbon steel weld neck flange:
1. Diameter of center circle of bolt hole: 50mm-2130mm
2. Diameter of bolt hole: 11mm-30mm
3. Flange thickness of butt welding flange: 12mm-58mm
4. Outer diameter of pipe: A(17.2-2032mm) B(14-2020mm)
5. Flange diameter of butt welding flange: A(18-2036mm) B(15-2024mm)
6. Flange theoretical component: 0.36kg--234.6kg(DN1800)
7. Other drawings for customized flanges
Technological keys of Carbon steel weld neck flange
Carbon steel weld neck flange is usually made by forging or rolling process. When the steel plate or section steel is selected, it is necessary to meet the following requirements:
1. Ultrasonic inspection shall be carried out on butt welding flanges without stratification defects.
2. It shall be cut into strips along the rolling direction of the steel, and welded into rings through bending butt welding, so that the appearance of the steel forms the cylinder of the ring. Steel plate shall not be directly machined into butt welding flange with neck.
3. Full penetration weld shall be selected for butt weld of ring.
4. The butt weld of the ring shall be heat-treated after welding, and 100% X-ray or ultrasonic flaw detection shall be conducted, and both X-ray and ultrasonic flaw detection shall meet the requirements of the standards.
Forging advantages of Carbon steel weld neck flange
1. Forging flanges generally contain less carbon than casting flanges and are less likely to rust. Forgings are streamlined, have a compact structure and have better mechanical properties than casting flanges.
2. Improper forging process will also result in large or uneven grain size, hardening cracks and forging forming higher than casting flange.
3. Forgings can accept higher shear and tensile forces than castings.
4. Forgings have the advantage of average internal structure and no harmful defects such as porosity and inclusion in castings.
Usage of Carbon steel weld neck flange
1. The Carbon steel weld neck flange have corresponding rigid and elastic demand and reasonable butt thinning transition, joint from the faying surface interval is big, the faying surface from welding deformation temperature, it adopts the complex syndromes beep form structure, suitable for pressure or temperature of pipeline or high temperature, high pressure and low temperature pipes, commonly used in PN is greater than 2.5 MPa pipes and valves cohesion; It is also used for transporting expensive, flammable and explosive media.
2. Carbon steel weld neck flange is a kind of pipe fitting, which refers to the flange with neck and the transition of circular pipe and connected with butt welding of pipe. Butt welding flange is not easy to deform, well sealed, widely used, there are corresponding rigid and elastic requirements and reasonable butt welding thin transition, welding gap from the joint surface, joint surface from welding temperature deformation.
