High Quality Expansion Alloy DIN1.3912/Uns K94610 Kovar Strip

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High Quality Expansion Alloy DIN1.3912/Uns K94610 Kovar Strip

(Common Name: Kovar, Nilo K, KV-1, Dilver Po, Vacon 12, ASTM F15, W.Nr 1.3912, UNS K94610 Ni29Co18)

FeNiCo Glass Sealing Alloys
Grade4J29,4J44
SizeStrip:(0.03-0.1)mm*(180-250)mm
(0.1-1.0)mm*(10-250)mm
(1.0-3.0)mm*(100-250)mm
Wire:0.1-6.0mm
Bar:20-100mm(Hot forging)
       2.0-20mm(Cold drawing)
FeaturesIt has a certain linear expansion coefficient in the temperature range of -60ºC ~ + 400ºC, which can be matched with hard glass to seal firmly
ApplicationSuitable for electric vacuum components and emission control, shock tube, igniting tube, glass magnetron, transistors, seal plug, relay, integrated circuits lead, chassis, brackets and other housing sealing.


Normal composition%

GradeCPSMnSiCuCrMoNiCoFe
4J290.030.020.020.50.30.20.20.228.5-29.516.8-17.8Bal.
4J440.030.020.020.50.3≤0.20.20.234.2-35.28.5-9.5Bal.


Tensile Strength, MPa

Code of conditionConditionWireStrip
RSoft≤585≤570
1/4I1/4 Hard585~725520~630
1/2I1/2 Hard655~795590~700
3/4I3/4 Hard725~860600~770
IHard≥850≥700


Typical Physical properties

Density (g/cm3)8.2
Electrical resistivity at 20ºC(Om*mm2/m)0.48
Temperature factor of resistivity(20ºC~100ºC)X10-5/ºC3.7~3.9
Curie point   Tc/ ºC430
Elastic Modulus,  E/ Gpa138


Coefficient of expansion

θ/ºCα1/10-6ºC-1θ/ºCα1/10-6ºC-1
20~607.820~5006.2
20~1006.420~5507.1
20~2005.920~6007.8
20~3005.320~7009.2
20~4005.120~80010.2
20~4505.320~90011.4


Ualloy   main Precision Alloy
Soft magnetic   alloy1J17,1J18,1J36(Corrosion-resistant)
    1J34,1J40,1J51,1J52,1J65,1J67,183(Rectangular hysteresis loop)
    1J66(Constant permeability)
    1J87,1J88,1J89,1J90,1J91(High hardness,high resistance and high   permeability
    1J76,1J77,1J79,1J80,1J85,1J86(High initial permeability)
Elastic alloy3J01,3J21,3J22,3J40,3J53,3J58,3J47
    (High elasticity, corrosion resistance, weak magnetism or non magnetism)
Expansion   alloy4J32,4J36(Low expansion)
    4J33,4J34(Fe-Ni-Co ceramic sealing alloy)
    4J29,4J44(Fe-Ni-Co   glass sealing alloy)
    4J06,4J47,4J49,4J6A,4J6B,4J49A(Fe-Ni-Cr glass sealing alloy)
    4J42,4J45,4J50,4J52,4J54(Fe-Ni   glass sealing alloy)
    4J43(Dumet alloy)

精密合金图

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