METAL OXIDATION APPARATUS.

摘要

Metal oxidn. appts. for forming a passivation film on the surface of a bent pipe of a metal to be oxidised has a bent portion such as a stainless steel pipe. The appts. includes an oxidn. furnace, a gas inlet for introducing a gas into the oxidn. furnace, an exhaust port for discharging the gas from inside the furnace, a heater for heating the furnace to a predetermined temp. and a holder for fixing a tubular metal to be oxidised having a bent portion inside the furnace, the holder serving also as a connection joints. The inlet comes into contact with one of the ends of the bent metal pipe and the exhaust comes into contact with the other end. The bent metal pipe to be oxidised is heated and oxidised in a dry oxidising atmos. while a gas is being passed through the inside of the bent metal pipe to be oxidised.