Waste gas conveying pipe for carburizing furnace and mounting structure of waste gas conveying pipe

The invention discloses a waste gas conveying pipe for a carburizing furnace and a mounting structure of the waste gas conveying pipe. The mounting structure of the waste gas conveying pipe for the carburizing furnace comprises the waste gas conveying pipe for the carburizing furnace and a carburizing furnace cover; the waste gas conveying pipe for the carburizing furnace comprises a metal outer pipe, a ceramic inner pipe and a metal flange; the ceramic inner pipe is fixed to the outer metal pipe; the outer metal pipe is arranged on the outer periphery of the ceramic inner pipe in a sleeving mode; the outer wall surface of the ceramic inner pipe is attached to the inner wall surface of the outer metal pipe; the metal flange is fixed to one end of the outer metal pipe; the other end of theouter metal pipe penetrates through the carburizing furnace cover to be extended into a hearth; the ceramic inner pipe and the metal flange are arranged at the same end of the metal outer pipe; and the waste gas conveying pip