What are the common problems of annealing furnaces

What are the common problems of annealing furnaces

1. Whether the annealing temperature reaches the specified temperature. Bright annealing furnace generally adopts solution heat treatment, which is called "annealing", and the temperature scale is 1040~1120℃ (Japanese standard). It can be observed through the observation hole of the annealing furnace that the stainless steel tube in the annealing zone should be in an incandescent state, but it does not appear to be softened and sagging.

2. 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 an inert gas, the purity can be lower, but it should not contain too much oxygen and water vapor.

3. The airtightness of the furnace body. The bright annealing furnace should be closed and isolated from the outside air; if hydrogen is used as the maintenance gas, only one exhaust port is open (used to ignite the discharged hydrogen). The method of inspection can be wiped with soapy water on the joints of the annealing furnace to see if it is out of gas; the place where the gas out is relatively simple is the place where the annealing furnace enters the pipe and the place where the pipe exits. This local sealing ring is particularly easy to wear. Always check and change frequently.

4. Maintain air pressure. In order to avoid slight leakage, the maintenance gas in the furnace should be maintained at an appropriate positive pressure. If it is hydrogen maintenance gas, it is generally required to be above 20kBar.

5. Water vapor in the furnace. On the one hand, check whether the furnace body material is dry. When installing the furnace for the first time, the furnace body material must be dried; second, whether the stainless steel pipe entering the furnace has too much water stains, especially if there are holes on the pipe, do not leak water in. Otherwise, the atmosphere of the stove will be destroyed. If these types of problems are not present, the stainless steel tube that should be backed about 20 meters after the furnace starts to shine, which is the kind of bright and reflective.

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