Materials for manufacturing bimetallic strips. Bimetallic strips are a relatively simple self-regulating component used for temperature control.

It consists of two metals (or alloys) with different coefficients of thermal expansion. The layer with the higher coefficient is the active layer, while the layer with the lower coefficient is called the passive layer.

The bimetallic strip heats up when exposed to heat.

The active layer has a greater length than the passive layer, but due to the firm bonding of the two layers, the bimetallic strip bends into an arc. The opposite occurs when cooled.

This feature can be utilized to manufacture thermal relays, commonly used for overload protection in motors.
The active and passive layers of the thermal bimetallic strip have certain compositions.

For instance;Active layer componentMn75% 、Ni15%、Cu10%OrNi20%、Mn6%The remainder is iron.

Its coefficient of thermal expansion is20～100℃Internally, it consists of27×10-6/℃And20×10-6/℃；

And the passive layer composition isNi36%Please provide the Chinese content to be translated.Ni42%The material is iron, with a coefficient of thermal expansion.(1.8～4.8)×10-6/℃。

Methods of bonding hot bimetallic strips include cold rolling, fusion bonding, and hot rolling bonding, etc.
Heat-treatable dual-phase metal materials can be divided into6Species.

①Universal:Suitable for various applications and a moderate temperature range, offering high sensitivity and strength.

②High-temperature type: Suitable for use in300℃The aforementioned tasks, High strength and excellent antioxidant properties.

③Low-temperature type: Suited for0℃Below tasks.

④Resistive:Available in varying resistivity levels for selection, suitable for various miniaturized and standardized electrical appliances.

⑤Highly sensitive: Features high sensitivity and high resistance.

⑥Corrosion-Resistant: Offers excellent corrosion resistance, suitable for operation in corrosive media.