Stainless steel flange material how to choose


Mainly used in the food industry and surgical equipment, adding molybdenum to obtain a special structure of anti-corrosion. Because of its better resistance to chloride corrosion than 304, it is also used as "marine steel"
Mainly used in the food industry and surgical equipment, adding molybdenum to obtain a special structure of anti-corrosion. Because of its better resistance to chloride corrosion than 304, it is also used as "marine steel". SS316 is usually used in nuclear fuel recovery units. Grade 18/10 stainless steels generally also meet this application level.
In order to save stainless steel material, the form of welding ring is adopted. For this structure, the sealing surface must be processed after the welding ring and the pipe are welded. Generally, it is used under the operating pressure of 2.5MPa. Due to the poor connection rigidity and poor sealing performance, the smooth surface flat welding flange is not suitable for equipment with high air tightness requirements for toxic and flammable and explosive media.
The connection plate material of this structure is made of carbon steel or stainless steel. If carbon steel is used, the surface needs to be nickel-plated, and the clamp material is cast aluminum ZL7. The sealing roughness of the connection plate is 20, and there should be no obvious radial grooves. and nicks. The specific structure can be seen in GB4982-85.

 

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