The problem with propane is that it breaks down extremely easily at temperatures above 600°C, basically into hydrocarbons and methane. The rate of this decomposition is very fast, and it does not require a catalyst. It will even decompose in the furnace space around the workpiece, causing the furnace sill to produce carbon black, which cokes in the lower temperature areas of the furnace, such as the inner wall of the furnace and the pipes of the pump.Vacuum Hardening Stainless Steel At the same time, it is also difficult to supply carbon evenly to the workpiece in the case of intensive furnace charging or complex geometry of the workpiece (with deep or blind holes). By using a special nozzle, pulse carburizing and increasing the flow rate of propane gas, the uniformity of carbon transmission is improved to a certain extent, but the problem has not been completely solved.Aluminum Alloy Brazing in Vacuum Furnace The chemical formula of this new carburizing agent acetylene is CH, which has a high carbon supply capacity and will only decompose when it comes into contact with the metal surface, so it can make densely charged (even stacked) workpieces And workpieces with large blind holes with small diameters and large lengths can be uniformly carburized. Metallographic Inspection Knowledge of Bolt Quenching And TemperingAt the same time, if certain conditions are met, even if the furnace pressure is higher than 1 000 Pa, this technology can almost completely eliminate the problems of carbon black formation and coking encountered in propane carburizingDie Steel Vacuum Nitriding