The butt welding flange is now no longer frequent to deform, seals well, is extensively used, has the corresponding inflexible and elastic requirements and practical 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 complex cough flare structure, which is awesome for pipelines with massive fluctuations in stress or temperature or pipelines with excessive temperature, excessive stress and low temperature, and is normally 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, handy surface, acid and alkali resistance, anti-corrosion, sturdy texture performance.
Production process: Oxygen furnace cutting, critical forging or finished product forging and lowering 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 strain 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 prerequisites shall meet the necessities of III. and forgings: (1) Forgings for flanges with nominal strain PN≥10.0MPa; (2) Chromium-molybdenum metal forgings with nominal stress PN>4.0MPa; (3) Ferritic metal forgings with nominal stress PN>1.6MPa and working temperature ≤-20 ranges Celsius.
2. Butt welding flanges are normally made of forgings or forging and rolling processes. When manufactured with metal plates or sections, the following necessities ought to be met: 1. The butt welding flange have to be examined by way of ultrasonic flaw besides delamination defects; two It have to be reduce into strips alongside the rolling path of the steel, and shaped into a ring with the aid of bending and butt welding, and the floor of the metal ought to shape a cylindrical floor of the ring. The metal plate shall no longer be without delay machined into a butt welding flange with a neck; three The butt weld of the ring need to be absolutely penetrated weld; four The butt weld of the ring have to be warmth handled after welding, and one hundred percent 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 facet of the neck of the butt welding flange must no longer be larger than 70°. The butt welding flange strictly controls the technical parameters at some point of manufacturing and welding to make sure that it can play a full position and price in manufacturing and use.
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