The material of the electric heating tube determines its service life

The material of the electric heating tube determines its service life

Instant electric water heater mainly consists of heating groove plate, pressure sensor, power regulator, water flow regulating faucet, inlet pipe and outlet pipe components, among which the heating groove plate is a key component of instant electric water heater. The heating tank consists of a slot weight, a sealing ring, a cover, and an electric heating element. The electric heating element is located in the slot of the slot plate and is generally referred to as the inner liner of the instant heating water heater. The instant hot water heater uses a stainless steel heating tube as the heating element, and cold water enters the inner tank and flows directly through the surface of the stainless steel electric heating tube to be heated. Stainless steel electric heating pipes are currently the most commonly used heating method in the instant electric water heater industry.

The advantages of stainless steel heating pipes are: good heat resistance, dry burning resistance, mature technology, and low cost. At present, there are many types of stainless steel heating pipes used by various instant electric water heater manufacturers, and the price difference of each pipe is large. The difference in quality and performance between electric heating tubes made of stainless steel is also significant. The main difference in the quality of stainless steel electric heating tubes is the difference in nickel content. Nickel is an excellent corrosion-resistant material, and when combined with chromium in stainless steel rods, it can improve the corrosion resistance and process performance of stainless steel. But in order to obtain 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 changed.

Therefore, in terms of material, 800, 840, and 316L are relatively good corrosion-resistant and high-temperature resistant stainless steel electric heating pipes. The nickel content of 800 stainless steel pipes reaches 30%, while that of 840 pipes reaches 20%. However, if using worse 304 stainless steel pipes, the nickel content is only 8%. Therefore, using products with high nickel content, high-temperature and corrosion-resistant stainless steel heating tubes is also very advantageous.

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