Talking about steel pipe flange, we would consider the materials used for making it. With different elements in original production process, we would finally get different flanges with various function.
Generally speaking, stainless steel, cast iron, aluminium, brass, bronze, plastic and so on would be the basic material applied among the production of pipe flange. And the most used material is forged carbon steel.
Meanwhile, for the flanges, it is necessary to add layer for the specific purpose. Thus we can get high quality flanges for engineering project.
Of course, we should choose the flange according to the steel pipes we used. In most cases, a flange is of the same material as the pipe.