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Features of stainless steel flanges and precautions for use

by:Mayer     2021-08-14
Stainless steel flanges are a common type of flanges. Because of their ability to withstand greater pressure and the characteristics of stainless steel, they are deeply loved by people in the industry and are widely used. Let's take everyone to understand the characteristics of the stainless steel flange and the precautions for its use. Flange characteristics Flanges are also called flanges or flanges. It is the part that connects the pipe to the pipe. Connect to the end of the pipe. There are holes on the flange, bolts can be used to make the two flanges tightly connected. The flanges are sealed with gaskets. Flanged pipe fittings refer to pipe fittings with flanges (lugs or connecting plates). It can be formed by casting, or it can be formed by threaded connection or welding. The flange connection consists of a pair of flanges, a gasket and several bolts and nuts. The gasket is placed between the sealing surfaces of the two flanges. After tightening the nut, the gasket is composed of a gasket, a gasket and several bolts and nuts. The gasket is placed between the sealing surfaces of the two flanges. After tightening the nut, the gasket is composed of a gasket, a gasket and several bolts and nuts. The gasket is placed between the sealing surfaces of the two flanges. After tightening the nut, the specific pressure on the gasket surface reaches a certain value and deforms and fills the sealing surface. The upper unevenness makes the connection tight and leak-proof. Some pipe fittings and equipment have their own flanges, which are also flange connections. Flange connection is an important connection method for pipeline construction. The flange connection is easy to use and can withstand greater pressure. In industrial pipelines, flange connections are widely used. In the home, the pipe diameter is small, and it is low pressure, and the flange connection is invisible. If you are in a boiler room at the production site, there are flange-connected pipes and equipment everywhere. In layman's terms, the function of the flange is to fix and seal the joints of the pipes. Precautions for the use of stainless steel flanges 1. In order to prevent the corrosion between the eyes due to the heating of the flange cover, the welding current should not be too large, about 20% less than carbon steel electrode, the arc should not be too long, and the interlayer cooling should be fast and narrow. The weld bead is appropriate. 2. The electrode should be kept dry when used. The calcium-titanium type should be dried at 150°C for 1 hour, and the low-a hydrogen type should be dried at 200-250°C for 1 hour (do not repeat the drying multiple times, otherwise the coating will easily crack and peel) , Prevent the electrode coating, sticky oil and other dirt, so as not to increase the carbon content of the weld and affect the quality of the weldment. 3. When stainless steel flange pipe fittings are welded, carbides are precipitated after repeated heating, which reduces corrosion resistance and mechanical properties. 4. Chromium stainless steel flange pipe fittings have larger hardenability American standard flanges after welding and are prone to cracks. If the same type of chromium stainless steel electrode (G202, G207) is used for welding, preheating above 300°C and slow cooling treatment at about 700°C after welding must be carried out. If the weldment cannot be subjected to post-weld heat treatment, stainless steel flange pipe welding rods (A107, A207) should be used. 5. For stainless steel flanges, appropriate amount of stability elements Ti, Nb, Mo, etc. are added to improve corrosion resistance and weldability. The weldability is better than that of chromium stainless steel flanges. When using the same type of chromium stainless steel flange electrode (G302, G307), preheating above 200°C and tempering treatment at about 800°C after welding should be carried out. If the weldment cannot be heat treated, stainless steel flange pipe welding rods (A107, A207) should be used. 6. Stainless steel flange pipe fittings and butt welding flange electrodes have good corrosion resistance and oxidation resistance, and are widely used in chemical, fertilizer, petroleum, and medical machinery manufacturing.
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