Product Name：Carbon Steel Socket Welding Flange
The socket weld flange refers to a flange that is inserted into the flange ring step at the end of the pipe and welded at the pipe end and the outside. There are two types of neck and no neck. The neck flange has good rigidity, small welding deformation and good sealing performance.
The standards of butt welding flange, flat welding flange and socket welding flange are different. In addition, the diameter and wall thickness of the butt welding flange at the interface end are the same as those of the pipe to be welded, just like the two pipes.
The flat welding flange is a concave which is slightly larger than the outer diameter of the pipe at the interface, and the pipe is inserted and welded inside.
Butt welding has better welding performance and less corrosion.
The flat welding flange is generally used for low and medium pressure pipes, and the butt welding flange is used for the connection of medium and high pressure pipes. The butt welding flange is generally at least PN2.5MPa. The butt welding is used to reduce stress concentration.
Features of various flanges:
Socket welding flange is suitable for small diameter, high pressure and high temperature pipeline connection.
Flat welding has a boss like butt welding. There is a groove on the boss, and then the pipe is inserted into it for welding.
Socket welding means that there is no boss, and a groove is directly opened on the flange body, just like a hole is opened on the blind flange, and then a groove is opened.
The welding performance of flat welding is a little better than that of socket welding.
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Flange manufacturers are mainly used in the food industry and equipment to add molybdenum to obtain a special corrosion-resistant structure. It is also used as a "marine steel" because it has better resistance to chloride corrosion than 304. SS316 is usually used For nuclear fuel recovery devices, 18/10 grade stainless steel is generally suitable for this application level. In order to save stainless steel materials, the welding ring form is used. After the welding ring and the connecting pipe are welded, the structure must be processed.
The flanges used for different pipeline types are also different. Flange connection is an important connection method for pipeline construction. Welding is repeatedly adopted at the connection point. First, the labor intensity of labor is increased; the repeated welding method requires a large amount of materials, large equipment, and high cost. . When the ball is swept through a long-distance pipeline after the pressure test, the problems of high labor intensity, high consumables, large number of large equipment, and high cost are adopted in the use of repeated welding methods. Simple and quick opening flat welding flange construction method.
Flange manufacturers usually use flat welding flanges to hang under 2.5MPa or lower operating pressure, smooth and smooth, because of poor connection rigidity and poor sealing performance, they are not suitable for airtight toxic, flammable, and explosive materials. For equipment with high performance requirements, the connecting plate material of this structure is made of carbon steel or stainless steel. If carbon steel is used, nickel plating is required.
American standard flange connection is an important connection method for pipeline construction. American standard flange is a part that connects the pipe to the pipe and connects to the pipe end. There are holes on the American standard flanges and bolts make the two flanges tightly connected. The flanges are sealed with gaskets. We often see English abbreviations on the tube, so what they mean will be described below.
American standard flange connection is an important connection method for pipeline construction. American standard flange is a part that connects the pipe to the pipe and is connected to the pipe end. There are holes on the American standard flanges and bolts make the two flanges tightly connected. The flanges are sealed with gaskets. We often see English abbreviations on the tube, so what they mean will be described below.
1. The abbreviation mainly refers to the welding structure of the flange neck and the cylinder or the connecting pipe. The specific meaning is as follows:
(1) WN: Butt welding flange with neck;
(2) SO: flat welding flange with neck;
(3) BL: Flange cover, also called "blind plate";
(4) TH: threaded neck flange;;
(5) LJ: Loose flange, this type no longer exists in the new standard in 2009, and it has been modified to "LF/SE butt welded ring loose flange";
(6) SW: socket welding flange.
2, English abbreviation and translation:
WN=welding neck; SO=slip on sliding sleeve; BL=blind; TH=thread thread; LJ=lap joint loose sleeve connection; SW=socket welding.
3, the meaning of class 150:
(1) class 150 is the pressure rating in the American ASME standard system. The Ministry of Chemical Industry standard of my country quotes the European and American standard systems, so this pressure rating system is introduced.
(2) class150=PN2.0=nominal pressure is 2.0MPa;
(3) class300=PN5.0=nominal pressure is 5.0MPa;
(4) Bar is a unit of pressure, and 1 Bar is approximately equal to 0.1 MPa.
American standard flange material classification:
1, Carbon Steel (Carbon Steel):
ASTM A105, 20#, Q235, 16Mn, Q345b, ASTM A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2, ASTM A694 F42, F46, F48, F50, F52, F56, F60, F65, F70.
2, stainless steel (Stainess Steel):
ASTM A182 F304, 304L, F316, 316L, 1Cr18Ni9Ti, 0Cr18Ni9Ti, 321, 18-8.
3, alloy steel (Alloy Steel):
ASTM A182 F1, F5a, F9, F11, F12, F22, F91, A182F12, A182F11, 16MnR, Cr5Mo, 12Cr1MoV, 15CrMo, 12Cr2Mo1, A335P22, St45.8/Ⅲ.
Flange processing is generally divided into four processes
- First, the cost of smelting the embryo with scrap iron is lower because most of the smelting furnaces are small workshops, and the material is not guaranteed. Second, the process is simple and the carcass will have pores
- The second type is steel plate cutting flanges, which are generally produced by regular enterprises. The material is relatively regular. Generally, small diameters are more common. It is easier to process, the tread is relatively flat, and the cost is lower.
- The third is that large-diameter flanges are generally cut from steel plates and then heated and simmered. The material is not good, but there is an interface in the middle that needs to be welded. Although the weld is not visible after processing, it is still not recommended to be used in high pressure On the pipe
The fourth type is forged flanges. The material is good and the density is high. It is the most troublesome to process, but the quality is the best. Many units only ask about the price and not the material. Can you buy good quality products?
