class 900 forged flange/carbon steel flange

Carbon steel flange of the another meaning is: according to the national standard size, the tolerance range, such as the production of flange, the difference in production is not according to the standard size of flange is also called second standard flange (someone called non-standard flange is not correct), usually some unscrupulous merchants will reduce two flange thickness, diameter size to achieve the purpose of saving material, and made from scrap steel and scrap steel flange, is usually the steel chemical composition and mechanical properties of substandard waste, moreover steelmaking production flange with black steel private, the private steel steelmaking technology using old, there is no guarantee that the mechanical properties and welding performance, use which may not be able to and steel pipe welding, such as cracks, porosity or steel itself will leak after welding. So try to choose when buying flanges carbon steel flange.