The characteristics of stainless steel electric heating tube are: 1 good heat resistance, 2 resistant to dry burning, 3 mature technology, 4 low cost. The quality of the internal material of the stainless steel electric heating tube affects the quality of the electric heating tube. The difference is that the nickel content is different. Nickel metal is a good corrosion-resistant material. The corrosion resistance of the stainless steel is mixed with the chromium in the stainless steel. strengthen. Ordinary stainless steel has a nickel content of only 23%, and a nickel content of 28% can cause a significant change in the corrosion resistance of stainless steel heating tubes in certain media. Therefore, from the material 316 800 840, these materials are corrosion resistant and resistant to high temperatures. 800 stainless steel nickel content reached 31%, 840 stainless steel nickel content reached 21%, 304 stainless steel tube nickel content was only 7%. From the cost considerations, normal heating water is sufficient with SUS304.