• Annealing temperature reaches the specified temperature

Flanged pipe fittings are generally treated by solution heat treatment, which is commonly called "annealing", with a temperature range of 1040~1120℃(Japanese standard).You can also observe through the annealing furnace observation hole, the flange fittings in the annealing area should be incandescent, but there is no softening sagging.

• Sealing of furnace body

The bright annealing furnace shall be enclosed and isolated from the outside air;With hydrogen as a guard gas, only one vent is open (to ignite the vented hydrogen).The method of inspection can be used to wipe the cracks of each joint in the annealing furnace with soap and water to see whether the air runs away;One of the most easy to run out of air is the annealing furnace into the pipe place and out of the pipe place, the sealing ring in this place is particularly easy to wear, often check and change.

• Protect air pressure

In order to prevent micro-leakage, the protective gas in the furnace should maintain a certain positive pressure. If it is hydrogen protective gas, it is generally required to be above 20kBar.

•  Annealing atmosphere

Generally, pure hydrogen is used as the annealing atmosphere. The purity of the atmosphere is better than 99.99%. If the other part of the atmosphere is inert gas, the purity can also be lower, but it must not contain too much oxygen and water vapor.

• Water vapor in furnace

On the one hand, check whether the furnace body material is dry, the furnace body material must be dried;The second is whether the flange pipe fittings into the furnace remain too much water stains, especially if there are holes in the flange pipe fittings, do not leak in, otherwise the furnace atmosphere will be completely destroyed.