ASME Butt Welding Flanges

The butt welding flange is now no longer frequent to deform, seals well, is notably used, has the corresponding inflexible and elastic requirements and good butt welding thinning transition, the welding joint is a prolonged way from the joint surface, and the joint floor is blanketed from welding temperature deformation, it adopts a accelerated intricate cough flare structure, which is great for pipelines with massive fluctuations in stress or temperature or pipelines with excessive temperature, excessive stress and low temperature, and is usually used for the connection of pipelines and valves with PN accelerated than 2.5MPa, and is in addition used for transporting expensive, flammable and explosive medium pipelines.

Forging, casting, and mid-plate turning

Flat welded flanges

Connection form: Single-sided welding, double-sided nut connection.

Product elements Beautiful appearance, on hand surface, acid and alkali resistance, anti-corrosion, sturdy texture performance.

Production process: Oxygen furnace cutting, quintessential forging or accomplished product forging and reducing forming.

Processing method: high-precision CNC lathe turning, CNC radial drilling and drilling.

Product parameters

(2) Bolt gap middle circle diameter: 50mm----2130mm

(3) Bolt gap diameter: 11mm-30mm

(6) Flange thickness: 12mm-58mm

(7) TUBE OUTER DIAMETER: A(17.2-2032MM) B(14-2020MM)

(8) Flange inner diameter: A(18-2036MM) B(15-2024MM)

(9) Flange theoretical weight: 0.36kg--234.6kg (DN1800)

1. The grade of the butt welding flange and its technical necessities have to meet the corresponding necessities of JB4726-4728. 　1. Carbon metal and austenitic stainless metal forgings with nominal stress PN of 0.25MP-1.0MPa are allowed to use Class I forgings. 　2. In addition to the following provisions, forgings with nominal stress PN of 1.6MPa-6.3MPa shall meet the necessities of grade II or above forging grades. 　3. Those who meet one of the following stipulations shall meet the necessities of III. and forgings: (1) Forgings for flanges with nominal stress PN≥10.0MPa; (2) Chromium-molybdenum metal forgings with nominal stress PN>4.0MPa; (3) Ferritic steel forgings with nominal stress PN>1.6MPa and working temperature ≤-20 ranges Celsius.

2. Butt welding flanges are typically made of forgings or forging and rolling processes. When manufactured with steel plates or sections, the following necessities ought to be met: 1. The butt welding flange have to be examined through way of way of ultrasonic flaw except delamination defects; two It have to be restriction into strips alongside the rolling route of the steel, and fashioned into a ring with the beneficial aid of bending and butt welding, and the ground of the steel ought to structure a cylindrical ground of the ring. The metal plate shall no longer be barring lengthen machined into a butt welding flange with a neck; three The butt weld of the ring favor to be truely penetrated weld; four The butt weld of the ring have to be warmness dealt with after welding, and one hundred share ray or ultrasonic flaw detection ought to be done, and the ray flaw detection meets the necessities of JB4730 Class II, and the ultrasonic flaw detection meets the Class I necessities of JB4730.

3. The slope of the outer aspect of the neck of the butt welding flange ought to no longer be massive than 70°. The butt welding flange strictly controls the technical parameters at some factor of manufacturing and welding to make high-quality that it can play a full feature and rate in manufacturing and use.