Flanges, gaskets, bolts and pipes are an inseparable combination in the pipeline system. The performance and installation of any type of product will affect the sealing of the entire pipeline system. Therefore, in order to use it better and safer, for products such as blue, they must be selected, especially flanges.
We all know that there are many types of flanges, and they are classified according to their materials. Generally speaking, there are two types of flanges: metal flanges and non-metallic flanges, including cast iron flanges, cast steel, forging, Q235, stainless steel flanges, plastic flanges, etc. Among them, carbon steel flanges are more common, and they are also the flange type with the lowest value and the largest output; stainless steel flanges are relatively expensive and belong to the better products of flanges. So, do you know what raw materials are used to make these flanges? What are the special features of choosing raw materials for flange production?
The more commonly used material for making carbon steel flanges is Q235B, which is usually called S235JR abroad, and there is also a material called SS400. These three materials can basically replace each other. Other materials such as Q345, 16Mn and 20Mn are also more common, and 20Mn is used in China instead of A105. Among them, A105 is a more common material in American standard flanges and is the basic material of American standard flanges. Common materials for European carbon steel flanges include S235JR, P235GH, P245GH, P250GH, C22.8, RST37.2, etc. Such materials can be found in domestic alternatives or manufacturers with the same label! Specifically, it is:
(1) 316 stainless steel (CF8M) can usually be used in the temperature range of -268°C to +649°C, but if it is to be used at a temperature above +425°C, the carbon content of the stainless steel flange specification is specified to be above 0.04%. Therefore, flanges made of 316 stainless steel are suitable for corrosive or ultra-low temperature or high temperature non-corrosive applications. (2) 316L stainless steel (CF3M) has a temperature range of up to +454°C and is suitable for corrosive or non-corrosive applications;
(3) 304 stainless steel (CF8) has a temperature range of -268°C to +649°C, and for temperatures above +425°C, the carbon content should be specified to be 0.04% or more. Therefore, flanges made of 304 stainless steel are more suitable for corrosive or ultra-low temperature or high temperature. Corrosive applications; (4) 304L stainless steel (CF3) has a temperature range of up to +425°C and is suitable for corrosive or non-corrosive applications; (5) 347 stainless steel (CF8C) has a temperature range of -268°C to +649°C. For temperatures above +540°C, the specification specifies a carbon content of 0.04% or more, so it is mainly used for high temperature and corrosive applications.
Well, the above is an introduction to the raw materials of flanges. No matter how many raw materials these flanges have, in fact, when choosing the raw materials of flanges, you need to choose according to the actual use occasion to avoid pipeline leakage.
To learn more, please visit the website:
www.baowi-steel.com