Nitech Stainless Inc has created a name in the Indian market as the leading manufacturer and supplier of Slip On Flanges in India. Nitech Stainless Inc has its manufacturing plants at different cities of India. . Our steel flanges contain prime quality materials. factory-made from quality steel meeting ASTM and/or AISI standards as a result of higher the standard, higher is that the toughness of the ASTM | ASME | ANSI flanges.