1. The most commonly used material by general customers is stainless steel 304. The working environment is generally divided into dry burning and liquid heating. If it is dry burning, such as for ovens or duct heaters, carbon steel or stainless steel 304 can be used. If heating liquid, for water, use stainless steel electric heating tubes, typically stainless steel 304; for oil, carbon steel or stainless steel 304 can be used. For weakly acidic or alkaline liquids, stainless steel 316 can be used. For strongly acidic liquids, stainless steel 316, polytetrafluoroethylene, or even titanium tubes should be used.
2. Determine the power of the heating tube based on the working environment.
Power setting mainly depends on dry burning and liquid heating. For dry burning, generally 1 meter of tube is rated at 1KW. For liquid heating, generally 1 meter of tube is rated at 2-3KW, with a maximum not exceeding 4KW.
3. Choose the shape of the heating tube according to the customer's electric heating equipment.
The shapes of stainless steel heating tubes are varied. The simplest is a straight rod, U-shaped heating tube, and then special shapes. Choose the specific shape of the electric heating tube according to the specific situation.
4. Determine the wall thickness of the heating tube based on the usage conditions. The performance curve for heating tube power calculation generally uses a wall thickness of 0.8mm. However, depending on the working environment, such as high water pressure, a thicker seamless stainless steel tube should be used to make the electric heating tube.
5. When purchasing, ask the manufacturer about the internal materials of the heating tube. Why do many heating tubes look similar but have large price differences? It lies in the internal materials. The two most important internal materials are insulating powder and alloy wire. For insulating powder, poor quality uses quartz sand, while good quality uses modified magnesium oxide powder. For alloy wire, common ones use iron-chromium-aluminum. Depending on the requirements and grade of the tube, nickel-chromium alloy wire can be used.
