1. For stainless steel components with relatively long tubes (such as 4-6 meters), they must be annealed at a high temperature of 900 ℃ before bending. In this case, the resistance wire should be made of nickel-chromium wire as much as possible instead of iron-chromium wire. How much is special high-temperature magnesium oxide, because aluminum (Al) is particularly easy to capture oxygen in MgO powder at 900 ℃ (a strong affinity between aluminum and oxygen), resulting in partial reduction of magnesium oxide, that is, MgO changes to metal magnesium, which will make MgO If the powder turns black, of course, it is much better to use nickel-chromium wire, because the affinity of chromium and oxygen is small, and the affinity of nickel and oxygen is also small, so to reduce the MgO powder, the reduction temperature is much higher.

2. Increasing the compression density of MgO powder can reduce the working temperature of the resistance wire, but this is meaningless for annealing (referring to stainless steel 900 ° C) in terms of power-on use, because the former has a temperature gradient, and the latter has a temperature at each point. equal.

3. Reducing the thickness of the insulating layer of the MgO powder can also reduce the working temperature of the MgO powder and improve the life of the heating tube.

4. Prevent the generation of organic matter and rust spots on the inner wall of the pipe. Therefore, the pipe, especially the iron pipe, must be pickled, dried and rusted. After the process is completed, the pipe is quickly filled with powder and used, and it must not be left for too long. Especially in the season with higher temperature, so as not to rust.

5. Since the MgO powder itself has organic matter, it will cause the magnesium powder to turn black. It is recommended to roast the used MgO powder before filling the powder.

6. MgO powder or block should not be exposed to sun and night dew, and it should not be exposed to rain in the open air, so as to avoid acid rain and harmful gases immersing in the block and powder.