Carbon steel flange is a flange plate or end flange connection whose body material is carbon steel. It contains flanges made of carbon steel, which are called carbon steel flanges. Common materials are cast carbon steel grade WCB, forgings A105, or Q235B, A3, 10#, #20 steel, 16 manganese, No. 45 steel, Q345B, etc.
Usually, in order to prevent rust, the surface of the flange is electroplated (yellow zinc, white zinc, etc.), or treated with anti-rust oil and spray anti-rust paint.
The pressure marks specified in this standard are divided into PN marks and Class marks.
PN mark has 12 pressure levels
They are: PN2.5; PN6; PN10; PN16; PN25; PN40; PN63; PN100; PN160; PN250; PN320; PN400
Grade marking has 6 pressure levels
They are: Class 150; Class 300; Class 600; Class 900; Class 1500; Class 2500
Another meaning of carbon steel flange is: flange plates produced in accordance with the dimensions and tolerance ranges required by national standards, which are different from flange pieces produced not in accordance with standard sizes, also called second-standard flanges (some people call them non-standard flanges). ) flange is incorrect), usually some unscrupulous businesses will reduce the thickness and outer diameter of the flange to save materials, and also use scrap steel or leftover steel to process the flange. Usually this steel has a chemical composition And the remaining mechanical properties are not up to standard. In addition, private steelmaking in black steel plants is used to produce flanges. The steelmaking technology used in this private steelmaking is outdated and cannot guarantee the mechanical properties and welding performance. It may not be welded to the steel pipe during use. Or there may be gaps, pores, etc. in the antenna itself, which may cause water leakage later. Therefore, when purchasing flanges, try to choose carbon steel flanges.
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