Carbon steel flange of another layer of meaning

　　Carbon steel flange of another layer of meaning is: according to the national standard dimensions, tolerances and other production of flange, different from the standard sizes not produced, also known as two standard flange piece flange (someone called non-standard method Lan is incorrect), usually some unscrupulous businesses will reduce flange thickness, the outer diameter of the two dimensions to achieve the purpose of saving material, as well as with scrap steel or scrap steel processing flange, usually this is the chemical composition of the steel and Mechanical properties of non-compliance of the waste or, worse, with black steel flange private steel production, steel making technology this private use of obsolete steelmaking can not guarantee the mechanical properties and weldability, there may not be time to use and pipe welding, or steel itself has cracks, holes and other leaks will go up after welding. So try to use the time of purchase flange steel flange.