Kovar Stainless Steels to SAE AMS 7727E (2000)

Kovar - Specification & Application

  • SAE AMS 7727E (2000) - Iron-Nickel-Cobalt Alloy, Bars and Forgings, 53Fe - 29Ni - 17Co, Low Expansion, Glass Sealing

Iron-Nickel-Cobalt Alloy, Bars and Forgings, 53Fe - 29Ni - 17Co, Low Expansion, Glass Sealing

Chemical composition(wt.%) of Kovar grade: to SAE AMS 7727E (2000)

Elements Min.(≥) Max.(≤) Similar Remarks
C - 0.04
Si - 0.20
Mn - 0.50
Ni - 29.00
Cr - 0.20
Al - 0.10
Cu - 0.20
Ti - 0.10
Fe - 53.00
Mo - 0.20
Co - 17.00
W - -
Mg - 0.10
Zr - 0.10

Kovar - Detail

Iron-Nickel-Cobalt Alloy, Bars and Forgings, 53Fe - 29Ni - 17Co, Low Expansion, Glass Sealing

Mechanical properties of grade Kovar SAE AMS 7727E (2000)

Proof strength
Rp0.2 (MPa)
Tensile strength
Rm (MPa)
Impact energy
KV (J)
Elongation at fracture
A (%)
Reduction in cross section on fracture
Z (%)
As-Heat-Treated Condition Brinell hardness (HBW)
126 (≥) 912 (≥) 42 42 33 Solution and Aging, Annealing, Ausaging, Q+T,etc 134

Physical properties of grade Kovar SAE AMS 7727E (2000)

Property Density
kg/dm3
Temperature T
°C/F
Specific heat
J / kgK
Thermal conductivity
W/mK
Electric resistance
µΩ·cm
Modulus of elasticity
kN/mm2
Expansion rate
421 (≥) 554 (≥) 23 41 13 Solution and Aging, Annealing, Ausaging, Q+T,etc 232
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0) N/mm2
Creep rupture strength
(10000h)
(Rp1,0) N/mm2
539 764 936

Equivalent Products

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