Butt Welding Flange
Butt welding flange is a kind of pipe fitting, which refers to the flange with neck and circular pipe transition and butt welded with the pipe. The butt welding flange is not easy to deform, has good sealing and is widely used. It has corresponding rigidity and elasticity requirements and reasonable butt welding thinning transition. The distance between the welded junction and the joint surface is large, and the joint surface is free from welding temperature deformation.
Application scope of butt welding flange
The butt welding flange is not easy to deform, has good sealing and is widely used. It has corresponding rigidity and elasticity requirements and reasonable butt welding thinning transition. The distance between the welded junction and the joint surface is large, and the joint surface is free from welding temperature deformation. It adopts a relatively complex horn shape structure, which is suitable for pipelines with large fluctuation of pressure or temperature or pipelines with high temperature, high pressure and low temperature. It is generally used for the connection of pipelines and valves with PN greater than 2.5MPa; It is also used for pipelines conveying expensive, flammable and explosive media.
Production process of butt welding flange
Forging, casting, medium plate turning
The connection form is single-sided welding and double-sided nut connection.
The product features beautiful appearance, smooth surface, acid and alkali resistance, anti-corrosion and strong texture performance.
The production process includes cutting materials from the oxygen furnace, forging as a whole or forging and cutting the finished products.
Processing mode high precision CNC lathe turning, CNC rocker drill drilling.
Product parameters of butt welding flange
(1) Diameter of bolt hole center circle: 50mm --- 2130mm
(2) Bolt hole diameter: 11mm-30mm
(3) Flange thickness: 12mm-58mm
(4) Outer diameter of pipe: a (17.2-2032mm) B (14-2020mm)
(5) Inner diameter of flange: a (18-2036mm) B (15-2024mm)
(6) Theoretical weight of flange: 0.36kg -- 234.6kg (DN1800)
Technical requirements for butt welding flange
A.The grade and technical requirements of butt welding flange shall meet the corresponding requirements of jb4726-4728. 1. Grade I forgings are allowed for carbon steel and austenitic stainless steel forgings with nominal pressure PN of 0.25mp-1.0mpa. 2. In addition to the following provisions, forgings with nominal pressure PN of 1.6mpa-6.3mpa shall meet the requirements of grade II or above. 3. If one of the following conditions is met, it shall meet the requirements of III and Forgings: (1) forgings for flanges with nominal pressure PN ≥ 10.0MPa; (2) Chromium molybdenum steel forgings with nominal pressure PN > 4.0Mpa; (3) Ferritic steel forgings with nominal pressure PN > 1.6Mpa and working temperature ≤ - 20 ℃.
B. Butt welding flanges are generally made of forgings or forging and rolling process. When it is made of steel plate or section steel, it must meet the following requirements: 1. The butt welding flange shall be subject to ultrasonic flaw detection without delamination defect; 2. The steel shall be cut into strips along the rolling direction, bent and butt welded into a ring, and the surface of the steel shall form the cylindrical surface of the ring. It is not allowed to directly machine the steel plate into a neck butt welding flange; 3. The butt weld of the ring shall be full penetration weld; 4. The butt weld of the ring shall be subject to post weld heat treatment and 100% radiographic or ultrasonic flaw detection. The radiographic flaw detection shall meet the class II requirements of JB4730 and the ultrasonic flaw detection shall meet the class I requirements of JB4730.
C.The outer slope of the neck of butt welding flange shall not be greater than 70 °. The technical parameters of butt welding flange shall be strictly controlled during production and welding to ensure that it can give full play to its role and value in production and use.
Common production standards
Ministry of chemical industry standard Hg / t20592-2009
HG/T20615-2009
National standard GB / t9115 1-2000、GB/T9115. 2-2000、GB/T9115. 3-2000、GB/T9115. 4-2000
Standard of Ministry of machinery JB / t86 2-94
Marine Standard CB / t47-1999
Butt welding flange production materials
WCB (carbon steel), LCB (low temperature carbon steel), LC3 (3.5% nickel steel), wc5 (1.25% chromium, 0.5% molybdenum steel), wc9 (2.25% chromium), C5 (5% chromium% molybdenum), C12 (9% chromium, 1% molybdenum), ca6nm (4 (12% chromium steel), CA15 (4) (12% chromium), CF8M (316 stainless steel), cf8c (347 stainless steel), CF8 (304 stainless steel), CF3 (304L stainless steel), cf3m (316L stainless steel), cn7m (alloy steel), m35-1 (Monel) N7m (Hastelloy b), cw6m (Hastelloy C), cy40 (Inconel)
Flanges include: forged steel flanges of carbon steel, alloy steel, low-temperature steel, stainless steel, dual phase steel and nickel base alloy, steel forgings for various boilers and Pressure Vessels, as well as various machinery and ship forgings.
Flange plates include plate flat welding flange, butt welding flange, neck flat welding flange, neck butt welding flange, loose sleeve flange, large mechanical flange, pressure vessel flange, socket flange, screw flange, flange cover, spectacle blind plate, pipe plate, plug, manhole, wind power flange, pipe flange and CNC precision flange.
Our partners specialize in flanges including the standards - ANSI; DIN; BS; UNI; JIS; SABS1000/3, also the custom design. It owns forging and casting factory which is well-equipped, and has a severe system for the quality control, which covers every process of the manufacturing ( raw material inspection, cutting, heating, gorging, heat treatment, machining, drilling, marking, washing, final inspection, packing, delivery).
We can provide the flanges(Forged Flange,Carbon Steel Flange, Weld Neck Flange, Slip on Flange, Blind Flange, Plate Flange, Threaded Flange, Non-Standard Flange, Socket Weld Flange) with the DN15mm-DN1500mm in the professional level and our main products include PL,SO,WN,BLD.in standards - ANSI; DIN; BS: UNI; JIS; SABS1000/3. Furthermore, we do custom design as well.
We are major at Cementing and Fracturing Equipment, Gate Valve and wellhead Christmas Tree,Plunger Pumps and Mud Pumps, Flow line Products, Solid Control Equipment,Drilling Rigs and Work over Rigs Matching Equipment etc.
High quality & Steady quantity & Most competitive price will be sent for you.
Contact Now
