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• • Product Name: 5J220110 hot bimetallic
    chemical composition:(%)
    Carbon C ≤ 0.05 silicon Si ≤ 0.02 sulfur S ≤ 0.2 manganese Mn0.20-0.60 Co cobalt 3.2-4.2
    Copper Cu5.2-5.80 Phosphorus P≤0.02 Ni Ni 31.5-33.0 Fe Fe: Balance
    Mechanical properties
    Yield strength (σs / MPa): 302 Tensile strength (σb / MPa): 470

    Elongation at break (δ5 /%): 25 Resistivity: 1.1 Density: 8.1

    Specifications: sheet, round bar, wire, strip

    Thickness: 0.1 mm or more Diameter: 0.01 mm or more

    Width: according to customer requirements Cold rolled strip: 0.05-0.10 × 2.5-100mm

    0.10-1.00 x 1.5-200 mm 1.00-2.50 x 6.0-200 mm

    
    Typical applications are as follows:

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    Low liquid gas production, storage and transportation

    
    Low working temperature is lower than + 200 ℃ below measurement and control instruments, such as temperature control device

    
    Low screw connector bushing between metal and other materials

    
    Low double metal and temperature control of double metal

    
    Low film type framework

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    Low shadow mask

    
    Low CRP of aviation industry parts drawing die

    
    Low below 200 ℃ framework of satellite and missile electronic control unit

    
    Low electromagnetic lens laser control device of auxiliary vacuum tube
     

Product real shot

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Hot double alloy

Thermobimetal refers to a composite material that is firmly bonded together by two (or more) metal or alloy component layers having different coefficients of thermal expansion. One of the precision alloys consists of two layers (or layers) of metal or alloy with different coefficients of thermal expansion as a thermal bimetallic layer. One of the constituent layers in the thermal bimetallic has a low coefficient of thermal expansion as a passive layer and the other element layer has a high coefficient of thermal expansion as the active layer. Sometimes, in order to obtain a special hot bimetallic, you can also add a third or fourth layer of metal or alloy. In general, the passive layer is made of Ni-containing 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 hot bimetallic, such as high temperature type, medium temperature type, low temperature type, high sensitivity type, corrosion resistance type, resistance type and quick type, can be obtained through different combinations of active layer and passive layer material.

characteristic

The main parameters of the thermal bimetallic properties are:

① than bending. Including all material properties that affect the amount of bimetallic bending. It is an important parameter to measure the degree of sensitivity of hot bimetallic to temperature changes.

② use temperature range. Thermal bimetallic can work normally over the temperature range. Including linear temperature range and allowable temperature range. The bending displacement of hot bimetallic in the linear temperature range is linear with the temperature and is greater than the bending value. The permissible temperature range is greater than the linear temperature range. In this range, although the bending value is lower, but the internal thermal stress is still lower than the elastic limit of the material, can still be safe to use.

③ elastic modulus. Calculate the parameters required for the thrust, moment and internal stress generated by the hot bimetallic element.

④ resistivity. Calculate the parameters of the heating temperature of the hot bimetallic elements that are directly energized. The main features of the most commonly used 3Ni24Cr2 (active layer) / 4J36 (passive layer) thermal bimetallic are: bending (room temperature ~ 150 ℃), (13.2 ~ 15.5) × 10-6 ℃ -1; allowable temperature range, 70 ~ + 450 ℃; linear temperature range, -20 ~ + 180 ℃; elastic modulus, ≥ 16000kgf / mm2; resistivity (20 ± 5 ℃), 77 ~ 84μΩ · cm. The following are the same as the "

The thermal expansion coefficient of each component of the hot bimetallic is different, and when the temperature changes, the expansion or contraction of each component is different and the hot bimetallic element as a whole is bent. This thermo-sensitive feature is widely used in temperature measurement, temperature control, temperature compensation and program control. Electrical industry in the thermal relay and circuit breakers, instrumentation industry in the meteorological instruments and ammeter, household appliances, electric irons, electric cookers, refrigerators and air conditioners are widely used thermal bimetallic components.

Process

The key process for making hot bimetallic is the composite process between the constituent layers. The composite process has fusion method, double pouring method, hot rolling method, cold rolling method and explosion method. A hot rolling method is commonly used, and the slabs of each component layer are hot-rolled at a high temperature at a high temperature and then subjected to cold rolling. The best quality of the product is cold rolling, the different components of the slab at room temperature with a large amount of cold rolling and composite, and then conventional cold rolling. Hot bimetallic is generally a strip or sheet.

Application

Bimetallic Strip: The hot bimetallic is a composite material that is firmly bonded by two or more layers of alloys with different linear expansion coefficients. The alloy layer with large expansion coefficient is called the active layer, and the alloy layer with smaller expansion coefficient is called the passive layer. The active layer and the active layer can be added with the intermediate layer of regulating resistance. When the ambient temperature changes, And the expansion coefficient of the passive layer is different, resulting in bending or rotation. This alloy is used for temperature control, temperature compensation, current limit, temperature indication and other automatic control devices and instrumentation in the thermal element. Can also be used in circuit breakers, switches, thermal relays, various types of temperature control components, home appliances protection, electronic protector, overload protection, condensate trap, temperature regulator, thermometer, incubator, weather equipment, Electric cooker, refrigerator, fire alarm, fluorescent starter, oven, lighter, current type automatic control switch, automatic safety switch and so on. Also used for fluid (gas. Liquid) valve switch and other low-voltage electrical components in the heat