Stainless steel pipe is now widely used in the market, it has a very important role in many industries. In order to reduce hardness, improve plasticity, refine grain and eliminate internal stress, annealing is necessary.

Continuous bright annealing furnace with ammonia decomposition protective gas is generally used for annealing of stainless steel tubes in intermediate state and finished products. It can protect the bright surface of stainless steel pipe, and the annealed finished pipe is bright. This kind of pipe does not need pickling, which overcomes the environmental pollution caused by pickling. So this kind of stainless steel bright annealing furnace is deeply loved by the majority of users.

Next, Suzhou jinruier Electric Furnace Co., Ltd. will discuss with you what problems should be paid attention to when stainless steel pipes are annealed, why some users turn green or not bright when stainless steel pipes are annealed, and what are the factors that affect the annealing of stainless steel pipes?

The stainless steel bright annealing furnace produced by our company has good annealing quality for thin-walled stainless steel bright tubes or pipe fittings. Generally, the annealing quantity per hour is more than 300 kg.

Firstly, the clean stainless steel tube is heated online to 1050 ℃ under the protection of hydrogen, and then rapidly cooled to below 60 ℃.

During the annealing process of stainless steel bright annealing furnace, we must pay attention to the following points:

1. The air tightness of muffle tube is the key factor of whether the stainless steel tube is bright or not.

2. The structure of the annealing furnace, the distribution of the temperature zone and the rationality of the thermal field of the annealing furnace directly affect the heating uniformity of the stainless steel tube. The stainless steel tube should be heated to incandescent state, but it can not appear softening and sagging.

3. The stainless steel tube itself has too much oil or water stains, so that the atmosphere in the furnace is destroyed, and the purity of protective gas can not be reached.

4. Ensure the micro positive pressure of the atmosphere in the furnace, so that the air will not be sucked back. For example, in the furnace, if it is ammonia decomposition mixed gas, it usually needs more than 20kbar.