Thermostatic bimetal strip

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  • The Definition and Operating Principle of Bimetals:

    Bimetal is bonding by two or more different expansion coefficients metal or alloy, whose shape changes at changing temperature.

    1、The active side of the bimetal requests large expansion coefficients, high melting point and similar modulus of elasticity with the passive side. And, there are many choices for the raw material of the active side, such as resisto, nickel-ironmanganese,manganin, pure Nickel, pure iron, brass, bronze,stainless steel, etc. Commonly used are Mn72Cu18Ni10,Ni22Cr3, Ni20Mn6, Ni18Cr11, Ni19Cr2, Ni25Cr8, etc.

    2、The passive side of the bimetal usually is the ferro-nickel with low expansion coefficients.In 1896, Guillaume invented the invar which having low expansion coefficients, at the room temperature only about 1.2×10-6/℃. It built up the foundation for the bimetal development. Commonly used are Ni36Fe, Ni39Fe, Ni40Fe,Ni42Fe, Ni45Fe and Ni50Fe.

    3、In order to attain different resistivity among the bimetal, we usually put in the lower resistivity metal between the active and passive side to affect the resistivity, such as pure Nickel, pure Copper etc.

    Product specifications:

    1. Classified by Temperature

    1)High Temperature:5J1070

    2)Medium Temperature:5J1480,5J1580 

    3)Low Temperature:5J20110,5J14140

    2. Classified by Heat Reactive:

    1)High-sensitive ( Flexivity > 30×10-6 /℃): 5J20110,5J14140

    2)Medium- sensitive ( Flexivity is at the range of 15~30×10-6/℃):

    5J1306A,5J1309A,5J1411A

    5J1320B,5J1325B,5J1430B

     3)Low- sensitive ( Flexivity <15×10 -6/℃): 5J0756

    3. Classified by Resistance:

    Resistance

    1)Low -Resistance series:

    2)Medium- Resistance series: 5J1325B,5J1433B

    3)High- Resistance series: 5J20110,5J14140

    Size:

    0.1 ~ 1.2×1~ 200

    Type

    Alloy grade of the combination layer

    Characters of bimetallic strip

    High expansion layer

    Intermediate layer

    Low expansion layer

    5J20110

    Mn75Nil5Cul0
    (Mn72Nil0Cul8)

     

    Ni36

    High sensitivity, High resistance, Suitable for medium temperature

    5J1480

    Ni22Cr3

     

    Ni36

    Medium sensitivity, Medium resistance, Suitable for medium temperature

    5J1580

    Ni20Mn6

     

    Ni36

    Medium sensitivity, Medium resistance, Suitable for medium temperature

    5J1070

    Nil9Cr11

     

    Ni42

    Medium sensitivity, Suitable for higher temperature

    5J1306A

    Ni20Mn6

    Cu

    Ni36

    Resistance series

    5J1306B

    Ni22Cr3

    Cu

    Ni36

    Resistance series

    5J1309A

    Ni20Mn6

    Cu

    Ni36

    Resistance series

    5J1309B

    Ni22Cr3

    Cu

    Ni36

    Resistance series

    5J1411A

    Ni20Mn6

    Cu

    Ni36

    Resistance series

    5J1411B

    Ni22Cr3

    Cu

    Ni36

    Resistance series

    5J1417A

    Ni20Mn6

    Cu

    Ni36

    Resistance series

    5J1417B

    Ni22Cr3

    Cu

    Ni36

    Resistance series

    5J1320A

    Ni20Mn6

    Ni

    Ni36

    Resistance series

    5J1320B

    Ni22Cr3

    Ni

    Ni36

    Resistance series

    5J1325A

    Ni20Mn6

    M

    Ni36

    Resistance series

    5J1325B

    Ni22Cr3

    Ni

    Ni36

    Resistance series

    5J1430A

    Ni20Mn6

    Ni

    Ni36

    Resistance series

    5J1430B

    Ni22Cr3

    Ni

    Nj36

    Resistance series

    5J1433A

    Ni20Mn6

    Ni

    Ni36

    Resistance series

    5J1433B

    Ni22Cr3

    Ni

    Ni36

    Resistance series

    5J1435A

    Ni20Mn6

    Ni

    Ni36

    Resistance series

    5J1435B

    Ni22Cr3

    Ni

    Ni36

    Resistance series

    5J1440A

    Ni20Mn6

    Ni

    Ni36

    Resistance series

    5J1455A

    Ni20Mn6

    Ni

    Ni36

    Resistance series

               

    PS:Strip thickness range:0.1~1.5mm; Strip width range:1.5~115mm。

    Strip size Tolerance range:

    Thickness mm

    Width mm

    Size

    Tolerance range

    Size

    Tolerance range

    0.1-0.25

    ±0.01

    1.5-12

    ±0.05

    0.25-0.50

    ±0.01

    12-25

    ±0.05

    0.50-0.75

    ±0.015

    25-75

    ±0.15

    0.75-1.50

    ±0.020

    75-100

    ±0.20

     

    Thermal bimetallic elements stabilized heat treatment system:

    Type

    Temperature

    Heat treatment

    Cooling method

    Holding time h

    5J20110

    260280

    12

    Air cooling

    5J1480

    300320

    5J1580

    300320

    5J1070

    380400

    5J1306

    250270

    5J1411

    250270

    5J1417

    250270

    5J1325

    300320

    5J1435

    300320

    5J1440

    300320

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