Abstract: Provided is a conductive composition for use in an electrophotographic apparatus and a conductive roll for use in an electrophotographic apparatus in which resistance reduction can be achieved even when an ion conductive agent is used. A conductive roll 1 includes a shaft 2, and a base layer 3, a surface layer 4, and an intermediate layer 5 that are formed around the shaft 2 and at least one of which contains a conductive composition containing a polar polymer and a conductivity imparting agent that is quaternary ammonium salt represented by the following formula 1: wherein R1 to R3 represent C1 to C14 alkyl groups, R4 represents one of a methacrylate group and an acrylate group, an anion represented by X? is any one of bistrifluoromethanesulfonimide, triflate, and fluorosulfonylimide, and A represents an alkylene group.

Abstract: A continuous gas carburizing furnace includes a gas carburizing processing chamber (a preheating chamber 2, a heating chamber 3, a carburizing chamber 4, a diffusion chamber 5 and a temperature decrease chamber 6) in which a gas carburizing process is performed on a workpiece 50, an oil quenching chamber 8 in which oil quenching is performed on the workpiece 50, and a gas quenching chamber 7 in which gas quenching is performed on the workpiece 50. The gas carburizing processing chamber includes a temperature decrease chamber 6 in which the temperature of the workpiece heated by a gas carburizing process is lowered. The temperature decrease chamber 6, the gas quenching chamber 7 and the oil quenching chamber 8 are arranged in that order from the upstream side to the downstream side in the conveying direction of the workpiece 50, and are adjacent to each other.

Abstract: A continuous gas carburizing furnace includes a gas carburizing processing chamber (a preheating chamber 2, a heating chamber 3, a carburizing chamber 4, a diffusion chamber 5 and a temperature decrease chamber 6) in which a gas carburizing process is performed on a workpiece 50, an oil quenching chamber 8 in which oil quenching is performed on the workpiece 50, and a gas quenching chamber 7 in which gas quenching is performed on the workpiece 50. The gas carburizing processing chamber includes a temperature decrease chamber 6 in which the temperature of the workpiece heated by a gas carburizing process is lowered. The temperature decrease chamber 6, the gas quenching chamber 7 and the oil quenching chamber 8 are arranged in that order from the upstream side to the downstream side in the conveying direction of the workpiece 50, and are adjacent to each other.