The pressure markings specified in this standard are divided into PN markings and Class markings.
PN marking has 12 pressure levels
Respectively: PN2.5; PN6; PN10; PN16; PN25; PN40; PN63; PN100; PN160; PN250; PN320; PN400
The Class tag has 6 pressure levels
Respectively: Class 150; Class 300; Class 600; Class 900; Class 1500; Class 2500
Another meaning of carbon steel flanges is: flange plates produced according to the dimensions, tolerance range, and other requirements of national standards. Different from flange plates not produced according to standard dimensions, which are also known as non-standard flanges (some people call non-standard flanges incorrect), some unscrupulous merchants usually reduce the thickness and outer diameter of the flange plate to achieve the purpose of saving materials, and also use waste steel or scrap steel to process flanges, Usually, this type of steel is a waste material with substandard chemical composition and mechanical properties. Some even use black steel plants to produce flanges through private steelmaking. The steelmaking technology used in this type of private steelmaking is outdated and cannot guarantee mechanical and welding properties. When used, it may not be able to weld with the steel pipe, or the steel itself may leak water after welding with cracks, pores, etc. So when purchasing flanges, try to choose carbon steel flanges as much as possible.
PN marking has 12 pressure levels
Respectively: PN2.5; PN6; PN10; PN16; PN25; PN40; PN63; PN100; PN160; PN250; PN320; PN400
The Class tag has 6 pressure levels
Respectively: Class 150; Class 300; Class 600; Class 900; Class 1500; Class 2500
Another meaning of carbon steel flanges is: flange plates produced according to the dimensions, tolerance range, and other requirements of national standards. Different from flange plates not produced according to standard dimensions, which are also known as non-standard flanges (some people call non-standard flanges incorrect), some unscrupulous merchants usually reduce the thickness and outer diameter of the flange plate to achieve the purpose of saving materials, and also use waste steel or scrap steel to process flanges, Usually, this type of steel is a waste material with substandard chemical composition and mechanical properties. Some even use black steel plants to produce flanges through private steelmaking. The steelmaking technology used in this type of private steelmaking is outdated and cannot guarantee mechanical and welding properties. When used, it may not be able to weld with the steel pipe, or the steel itself may leak water after welding with cracks, pores, etc. So when purchasing flanges, try to choose carbon steel flanges as much as possible.
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