| 摘要 |
<p>It is intended to inhibit the penetration of oxygen at the time of carrying of treatment object in an apparatus and realize rapid elimination of any penetrated oxygen to thereby efficiently carry out the operation of heat treatment of treatment object. There is provided a gas atmosphere heat treating apparatus comprising an inlet gas replacing compartment, a thermal reduction compartment, a cooling compartment and an outlet compartment, wherein in the inlet gas replacing compartment, temperature control is made by temperature control means so as to ensure a temperature which is not higher than the temperature at which any oxygen having penetrated in transfer passage reacts with a metal part to thereby cause oxidation discoloration but not lower than the temperature at which water produced from any penetrated oxygen and hydrogen gas contained in first and second reducing atmosphere gases becomes steam, and wherein in the vicinity of carry-in aperture of the inlet gas replacing compartment, first and second moving doors are disposed with a given spacing, and wherein the second moving door closes the transfer passage with an interstice left upside, and wherein between the first and second doors, there is disposed a vent for discharging steam together with reducing atmosphere gas outside the apparatus, and wherein inside the first moving door, there is disposed inert gas emission means.</p> |
