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How to choose stainless steel flange material?

Jul 31, 2019

How to choose stainless steel flange material?

Mainly used in food industry and surgical equipment, molybdenum is added to obtain a special structure of corrosion resistance. Compared with 304, it has better resistance to chloride corrosion, so it is also used as "Marine steel". SS316 is commonly used in nuclear fuel recovery facilities. Grade 18/10 stainless steels usually also meet this application level.

In order to save stainless steel material, use the form of welding ring. The sealing surface of this structure must be machined after welding ring and pipe. It is usually hung below the operating pressure of 2.5mpa. Smooth face welding flange, due to poor connection rigidity, poor sealing performance, so it is not suitable to use equipment with high air tightness requirements for toxic and inflammable and explosive media.

The connection plate of this structure is made of carbon steel or stainless steel. If it is made of carbon steel, the surface needs to be nickel-plated. The clamp material is cast aluminum ZL7.

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Stainless steel flange connection is the two pipes, pipe fittings or equipment, first respectively fixed in a flange, between two flange, plus pad, with bolts fastening together, completed the connection. Some pipe fittings and equipment have their own flange, is also a flange connection. Stainless steel flange with threaded flange and welding flange, it is a kind of disc-shaped parts, most common in pipeline engineering, flange are used in pairs. In pipeline engineering, flanges are mainly used for pipe connection. In the need to connect the pipeline, all kinds of installation of a flange, low-pressure pipeline can use wire flange, 4 kg above the use of welding flange. Low pressure small diameter wire flange, high pressure and low pressure large diameter are used welding flange, different pressure flange thickness and connection bolt diameter and number are different. Stainless steel flange piece will not produce corrosion, pitting corrosion, corrosion or wear, is one of the strongest metal materials used in construction. Due to its excellent corrosion resistance, stainless steel enables structural components to permanently maintain engineering design integrity.

Flange  buy from Flange Manufacturer can not be stored for a long time, should make regular inspection, often on the exposed processing surface must be kept clean, remove dirt, neatly stored in the indoor dryness, do not pile or open storage. Flange ball valve, globe valve, gate valve use, only for full open or closed, do not allow to regulate the flow, so as to avoid erosion of sealing surface, accelerate wear. Flange materials are convenient, simple manufacturing, low cost, widely used; But the rigidity is poor, so it can not be used for supply and demand, flammable, explosive and high vacuum requirements of chemical process piping system and high, extremely harmful occasions. The sealing surface type has plane and protruding surface. Flange structure is simple, small volume, light weight; Close and reliable, the sealing surface material of ball valve is widely used in plastic, good sealing, and has been widely used in vacuum system. Easy maintenance, ball valve structure is simple, the sealing ring is generally active, disassembly and replacement are more convenient; When fully open or fully closed, the sealing surface of the sphere and valve seat is isolated from the medium.


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