Patent ID: 7931854
Filing Date: 2011-04-26
Classification: F27B,F27D

Abstract:
1. A catalytic gas nitriding unit for steels and alloys comprising: a heating furnace, said heating furnace having an entry; a process gas catalyst impact block, means for supply, mixing, proportioning and extraction of process gases; and a device for indirect monitoring and control of the nitrogen potential in the furnace atmosphere, wherein the device of indirect monitoring and control of the nitrogen potential in the furnace atmosphere is an oxygen sensor, a secondary transducer with indication of the nitrogen potential in weight units of nitrogen content in iron and an actuator, said secondary transducer being a programmable microcomputer, said microcomputer having a subprogram for interpretation of a calculated nitrogen potential into a phase composition of a surface layer of treated steel and a subprogram for calculation of growth of a diffusion layer in real-time of the nitriding process; and wherein the process gas catalyst impact block is located on said heating furnace entry on a process gas supply line.