Due to the fact that the placement time of electric heating tubes should not be too long, there are several main reasons:

Due to the fact that the placement time of electric heating tubes should not be too long, there are several main reasons:

Internal factors include the absorption of moisture by magnesium oxide powder inside the electric heating tube, as well as incomplete sealing of the electric heating tube ports. Therefore, if left in a humid environment for a long time, moisture will enter the electric heating tube. At this point, magnesium oxide powder as a thermal conductor becomes moist, so the electric heating tube does not generate heat.

Situation analysis:

1. Measure if there is a resistance value, indicating that it is broken.

If there is still a resistance value, check for leaks. Use a megohmmeter (insulation resistance meter) to measure the insulation resistance value. If the insulation resistance value is relatively small, it means that the magnesium oxide powder in the electric heating tube may be affected by moisture, thereby weakening the insulation performance of the electric heating tube!

Solution:

(1) Dry the electric heating tube in the oven to dehumidify the magnesium oxide powder.

(2) Applying low voltage to the electric heating tube for a period of time also has a dehumidifying effect.

Stainless steel electric heating tubes are made by placing electric heating elements into metal tubes and tightly filling the gaps with crystalline magnesium oxide powder with good heat resistance, thermal conductivity, and insulation properties, which is processed by other processes. It has the characteristics of simple structure, high mechanical strength, high thermal efficiency, safety and reliability, easy installation, and long service life. Widely applicable to various saltpeter tanks, water tanks, oil tanks, acid-base tanks, melting furnaces for fusible metals, air heating furnaces, drying furnaces, drying boxes, hot pressing molds and other devices.

There are many types of stainless steel heating pipes used by instant electric water heater manufacturers, and the price difference between each type of pipe is significant. The quality and performance of electric heating tubes made of stainless steel also vary greatly. The main difference in the quality of stainless steel electric heating tubes is the difference in nickel content. Nickel is a corrosion-resistant material, and when combined with chromium in stainless steel, it can improve the corrosion resistance and process performance of stainless steel. However, in order to achieve pure austenite structure, low-carbon nickel steel needs to have a nickel content of 24%, and only when the nickel content is 27%, can the corrosion resistance of the steel in certain media be significantly improved. Therefore, in terms of material, 800, 840, and 316L are relatively better corrosion-resistant and high-temperature resistant stainless steel electric heating tubes. The nickel content of 800 stainless steel tubes reaches 30%, while that of 840 tubes reaches 20%. If a slightly inferior 304 stainless steel tube is used, the nickel content is only 8%. Therefore, the use of high temperature and corrosion resistant stainless steel heating tubes with high nickel content in 316L stainless steel bright rods is also very advantageous.

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