The carbon steel flange has a compact structure, simple design, and is easy to maintain. The sealing surface and spherical surface are often in a closed state, making them less susceptible to erosion by the medium. It is easy to operate and maintain, suitable for general working media such as solvents, acids, water, and natural gas. A flange made of carbon steel is referred to as a carbon steel flange. The surface of the carbon steel flange is flat and smooth, without burrs, scratches, or warping.

The steel plate should undergo ultrasonic testing, and any delamination defects should be cut into strips along the rolling direction of the steel. After bending, they should be welded into a circular ring, ensuring that the surface of the steel forms a cylindrical shape. Steel plates should not be directly machined into necked flanges; the butt welds should use full penetration welds. Using carbon steel bolts does not necessarily require insulation gaskets and sleeves; these are only used in cases where there is a possibility of electrical charge or where the fluid in the pipeline is flammable or explosive. In such cases, stainless steel bolts should also be equipped with insulation gaskets and sleeves.