JIS Butt Welding Flanges

The butt welding flange is now no longer typical to deform, seals well, is especially used, has the corresponding rigid and elastic necessities and precise butt welding thinning transition, the welding joint is a extended way from the joint surface, and the joint flooring is blanketed from welding temperature deformation, it adopts a accelerated difficult cough flare structure, which is gorgeous for pipelines with huge fluctuations in stress or temperature or pipelines with immoderate temperature, immoderate stress and low temperature, and is commonly 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 factors Beautiful appearance, on hand surface, acid and alkali resistance, anti-corrosion, sturdy texture performance.

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

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

Product parameters

(2) Bolt hole center circle diameter: 50mm----2130mm

(3) Bolt hole diameter: 11mm-30mm

(6) Flange thickness: 12mm-58mm

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

(8) Flange internal 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 requirements have to meet the corresponding requirements of JB4726-4728. 　1. Carbon metallic 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 requirements of grade II or above forging grades. 　3. Those who meet one of the following stipulations shall meet the requirements of III. and forgings: (1) Forgings for flanges with nominal stress PN≥10.0MPa; (2) Chromium-molybdenum metallic forgings with nominal stress PN>4.0MPa; (3) Ferritic steel forgings with nominal stress PN>1.6MPa and working temperature ≤-20 stages Celsius.

2. Butt welding flanges are usually made of forgings or forging and rolling processes. When manufactured with metal plates or sections, the following requirements ought to be met: 1. The butt welding flange have to be examined thru way of way of ultrasonic flaw besides delamination defects; two It have to be stop into strips alongside the rolling route of the steel, and everyday into a ring with the in reality recommended advisable beneficial aid of bending and butt welding, and the floor of the metal ought to structure a cylindrical ground of the ring. The metallic plate shall no longer be barring extend machined into a butt welding flange with a neck; three The butt weld of the ring pick out to be truely penetrated weld; 4 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 requirements of JB4730 Class II, and the ultrasonic flaw detection meets the Class I requirements of JB4730.

3. The slope of the outer hassle of the neck of the butt welding flange ought to no longer be big than 70°. The butt welding flange strictly controls the technical parameters at some element of manufacturing and welding to make great that it can play a full attribute and fee in manufacturing and use.