Carbon steel flange in accordance with national standards require the size, tolerance range and other production of the flange, the difference between the flange is not produced according to standard sizes also known as the second standard flange (some people call non-standard flange is incorrect

Carbon steel flanges are precise in shape and size, with low machining and low cost. However, cast flanges will have holes, cracks and impurities, and the internal structure of the casting is poor. The advantage is that it can have more complex shapes and be produced at low cost. Plain carbon steel

Another layer of national standard flange means: according to the national standard requirements of the size, tolerance range, etc. production of the flange, different from the flange is not according to the standard size of the production of the flange is also known as the second standard flange (