The selection standard of materials used for non-standard flange refers to metal materials with fire resistance not lower than 1587 ℃. It should be adopted according to the product design requirements and should comply with the current national material standards. Non-standard flanges are subjected to various physical and mechanical movements in the high temperature environment, which may cause refractory materials to be damaged by melting, softening, cracking and abrasion.
The non-standard flange materials mainly have the following strict requirements:
(1) Stainless steel and fuses have high temperatures and do not change and melt at operating temperatures;
(2) It can withstand the stress generated during high temperature operation, without losing structural strength, without deformation or breaking;
(3) The volume is stable at high temperatures, and the masonry is not deformed or cracked due to expansion and contraction;
(4) Non-standard flanges shall not rupture and peel off when the temperature changes or the heat is uneven;
(5) It should have a certain ability to resist chemical attack;
(6) It should have sufficient strength and wear resistance to withstand the scouring and impact of high temperature and high speed flame, soot and slag;
Large-diameter flanges should have good working performance, meet the requirements of pipe joint quality, and comply with the relevant product protection, safety protection regulations and technical specifications. Connect the bulk density. The ratio of the non-standard flange product nozzle to its total volume, the true density refers to the various pore volume openings that do not include other tube ends. The connection tightness is closed with one end of the nozzle, and the other end is connected to the outside, which can be safe. The ability of a gas to pass through a nozzle at normal temperature and pressure is usually measured by the gas permeability coefficient.
Raw materials for non-standard flange large-diameter flanges are made of refractory materials, high-temperature resistant materials, good sealing performance, and some ordinary steel materials and heat-resistant metals. Reasonable material selection plays an important role in ensuring the quality, safe and economic operation of large-diameter flange products and increasing their service life.
Source:China Stainless Steel Flanges Manufacturer – wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)
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