How to choose the material of electric heating tube shell
1. Stainless steel electric heating tube
There are many different grades of stainless steel for electric heating tubes, such as stainless steel 304, stainless steel 321, stainless steel 316L, stainless steel 310S, etc. Stainless steel 304 can be used for conventional non-alkaline water and oil heating, and stainless steel 316L is used for some acid and alkaline liquids, but stainless steel 316L is not suitable for strong acid and alkali. From the point of view of temperature resistance, the general working temperature is Stainless steel 304 can be used for temperatures around 300 degrees, stainless steel 321 is recommended for operating temperatures around 500 degrees, and stainless steel 310S is recommended for higher temperatures. The above is purely personal experience, not accurate theoretical value, for reference only.
2. Titanium electric heating tube
Titanium heating pipes are generally suitable for chrome plating, acid copper, nickel plating, passivation, filling, oxidation tank, chromic acid anodizing, phosphating acid tin plating and other processes, so the price of titanium heating pipes is also relatively high.
3. Teflon electric heating tube
Teflon electric heating tube is also called Teflon electric heating tube, polytetrafluoroethylene electric heating tube, commonly known as tetrafluoroethylene tube. Teflon electric heating tube is generally suitable for corrosive liquids such as strong acid and alkali. The general process temperature is less than 105 °C. The advantages of Teflon electric heating tube are that it does not adhere, does not scale, and has uniform surface heat dissipation, but the price is also high. , Due to the low temperature requirements, the surface load should not be too high in the design, so the Teflon electric heating tube has low power and high cost, so few Teflon electric heating tubes are used.
4. Quartz electric heating tube
Quartz electric heating tubes are generally suitable for anti-corrosive liquids, except for hydrofluoric acid. The disadvantage is that it is extremely fragile.