Thermally Bimetallic Composites/ Bimetallic Stripsare composed of two (or more) metal or alloy component layers with different thermal expansion coefficients.

Bimetallic metallic strip (in Chinese) is also [TJC STEEL]known as Bimetallic metallic strip (in foreign languages), a variety of metallic metallic strip metallic alloys for metallic collar areas

 

Introduction for Bimetallic Strip

A precision alloy consisting of two (or more) layers of metal or alloy with different thermal expansion coefficients as components.A group of tubesheets in thermally bimetallic materials have low thermal expansion coefficient and are passive layers.The other group of tubules has a high coefficient of thermal expansion and is the active layer.Sometimes a third or a fourth layer of metal or alloy may be added to obtain a thermally specific bimetal.In general, the passive layer is [TJC STEEL]made of an intile alloy containing Ni34 ~ 50%.The active layer is made of brass, nickel, Fe-Ni-Cr, Fe-Ni-Mn and MN-Ni-Cu alloy.Different types of thermobimetals, such as high temperature, medium temperature, low temperature, high sensitivity, corrosion resistance, resistance and quick action, can be obtained through different combinations of active and passive layer materials.

 

Features for Bimetallic Strip

The main parameters for the thermal bimetallic properties are: specific bending.Includes all material properties that affect the amount of thermal bimetal bending.It is an important parameter to measure the sensitivity of thermal bimetals to temperature change.Use temperature range.The range of temperatures at which a thermal bimetal can operate normally.Includes linear temperature range and permissible temperature range.In the linear temperature range, the bending displacement of the thermal bimetal has a linear relationship with the temperature, and the specific bending value is the largest.Allowed to use temperature range greater than linear temperature range.In this range, the internal thermal stress is still lower than the elastic limit of the material and can be used safely, although it is lower than the bending value.Modulus of elasticity.The parameters needed to calculate the thrust torque and internal [TJC STEEL]stress generated by the thermal bimetal element.Resistivity.The parameters of heating temperature of bimetallic elements heated by direct electrification are calculated.The main characteristics of the most commonly used 3Ni24Cr2(active layer)/ 4J36(passive layer) thermobimetal are: specific bending (room temperature ~ 150℃),(13.2 ~ 15.5)×10-6℃-1;Permissible temperature range, -70 ~ +450℃;Linear temperature range, -20 ~ +180℃;Elastic modulus,≥ 16000kGF /mm2;Resistivity (20 + / - 5 ℃), 77 ~ 84 mu Ω · cm.

The thermal expansion coefficient of each group is different, and the expansion or contraction amount of each group is different when the temperature changes, the thermal bimetal element as a whole will bend.This [TJC STEEL]characteristic is widely used in temperature measurement, temperature control, temperature compensation and program control.Thermal relays and circuit breakers in the electrical industry, meteorological instruments and galvanometers in the instrumentation industry, electric irons, stoves, refrigerators and air conditioning devices in household appliances are widely used in the thermal bimetallic components.

 

Process for Bimetallic Strip

The key process of manufacturing thermal bimetal is the composite process between each component layer.The composite process includes melting, double casting, hot rolling, cold rolling and explosion.The hot rolling method is commonly used, in which the slabs of each component layer are hot-rolled [TJC STEEL]at a high temperature under a large amount of pressure, and then cold rolled.The best product quality is the cold rolling method, in which the slabs with different component layers are cold-rolled and compounded at room temperature with a large amount of pressure, and then conventional cold rolling is carried out.Hot bimetal is usually strip or sheet.

 

Application for Bimetallic Strip

Bimetallic strip: thermally bimetallic strip is composed of two or more layers with different linear expansion coefficient of the alloy firmly combined with the composite material.The alloy layer with high coefficient of expansion is called active layer, while the alloy layer with low coefficient of expansion is called passive layer. An intermediate layer can be added between the active layer and the passive layer to adjust the resistance. When the environmental temperature changes, the expansion coefficient of the active layer and the passive layer is different, which causes bending or rotation.This alloy is used for temperature control, temperature compensation, current limitation, temperature indication and other automatic control devices and thermosensitive elements in instruments and meters.Can also be applied to the[TJC STEEL] circuit breaker, switch, thermal relay, all kinds of temperature control components, home appliance protector, electronic protector, overload protector, condensate drain device, temperature controller, thermometer, incubator, meteorological instruments, electric iron, electric rice cooker, refrigerator, fire alarm, fluorescent lamp, oven, lighter, the starter current mode control switch automatically, automatic protection switching rules, etc.Also used in fluids (gas).Liquid) valve switch and other medium and low voltage electrical thermal components.