What are the common mold heating tube shell materials? What are their respective advantages and disadvantages?

Common mold heating tube shell materials are mainly stainless steel, Ingel 800 alloy and ceramic.

1. Stainless steel

Advantages

Good corrosion resistance: Stainless steel contains alloy elements such as chromium and nickel, which makes it have good corrosion resistance in general humid environments and some chemical media. For example, in some injection molds, it may be exposed to chemicals such as additives in plastic raw materials. The stainless steel shell can effectively prevent corrosion and extend the service life of the heating tube.

Excellent mechanical properties: Stainless steel has high strength and can withstand a certain degree of mechanical external force. It is not easy to deform when the mold is installed, disassembled or subjected to changes in internal pressure of the mold. This is very important to ensure the integrity of the shape and internal structure of the heating tube, thereby ensuring stable heating performance.

Good processing performance: Easy to perform processing operations such as cutting and bending. This allows stainless steel heating tubes to be customized according to the shape and size requirements of different molds and adapt to various complex mold structures.

Mold heating tube

Disadvantages

Limited high temperature strength: At higher temperatures (such as more than 800-900℃), the strength of stainless steel will decrease, which may cause the heating tube to deform. In some application scenarios such as die-casting molds that require high-temperature heating, its performance may be limited to a certain extent.

Relatively weak thermal conductivity: Compared with some other high-performance alloys, stainless steel has slightly poor thermal conductivity. This may affect the heating efficiency, making the heat transfer to the mold relatively slow.

II. Ingla 800 alloy

Advantages

Strong high temperature resistance: Ingla 800 alloy is a high-temperature alloy that can work stably at temperatures up to 1000℃ or above. In some processes that require very high mold heating temperatures, such as high-temperature die-casting or special glass molding molds, this alloy shell heating tube can meet the needs well.

Excellent oxidation resistance: In high temperature environments, it can effectively resist oxidation and reduce the formation of surface oxide scale. This not only ensures the stability of the performance of the heating tube itself, but also avoids contamination of the mold or product due to oxide scale peeling.

Disadvantages

High cost: Because it contains a variety of rare alloy elements and has a complex manufacturing process, the price of Ingla 800 alloy heating tubes is relatively expensive. This means that in some cost-sensitive mold applications, the use of this heating tube will increase production costs.

High processing difficulty: Compared with stainless steel, Ingel 800 alloy is more difficult to process. When cutting, bending and other processing, more professional equipment and technology are required, which increases processing costs and processing cycles.

III. Ceramics

Advantages

Excellent insulation performance: Ceramics is an excellent insulating material that can effectively prevent leakage. In some mold heating environments with high electrical safety requirements, such as around molds containing conductive liquids or dust, ceramic shell heating tubes can provide reliable insulation protection.

High chemical stability: Ceramics can resist the erosion of most chemical substances, including strong acids and alkalis. In some chemical industry molds, such as reactor molds for chemical raw materials, ceramic shell heating tubes can ensure normal operation in harsh chemical environments.

Good thermal conductivity: Ceramic materials have good thermal conductivity and can quickly transfer the heat generated by the heating wire to the mold, improving heating efficiency.

Disadvantages

High brittleness: The biggest disadvantage of ceramic materials is high brittleness. It is easy to break if it is impacted by external force or if it is not careful during installation. This requires extra care during installation and use of ceramic shell heating tubes, increasing maintenance costs and risks of use.

Low thermal expansion coefficient: Compared with metal materials, ceramics have a lower thermal expansion coefficient. During the heating and cooling process, due to the difference in thermal expansion with the metal mold, the connection between the heating tube and the mold may become loose or poorly sealed.