Kovar Stainless Steels to SAE AMS 7728H (2000)

Kovar - Specification & Application

  • SAE AMS 7728H (2000) - Iron-Nickel-Cobalt Alloy, Sheet, Strip, and Plate, 53Fe - 29Ni - 17Co, Low Expansion Glass Sealing, Annealed

Iron-Nickel-Cobalt Alloy, Sheet, Strip, and Plate, 53Fe - 29Ni - 17Co, Low Expansion Glass Sealing, Annealed

Chemical composition(wt.%) of Kovar grade: to SAE AMS 7728H (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, Sheet, Strip, and Plate, 53Fe - 29Ni - 17Co, Low Expansion Glass Sealing, Annealed

Mechanical properties of grade Kovar SAE AMS 7728H (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)
593 (≥) 543 (≥) 22 33 42 Solution and Aging, Annealing, Ausaging, Q+T,etc 411

Physical properties of grade Kovar SAE AMS 7728H (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
435 (≥) 464 (≥) 13 32 11 Solution and Aging, Annealing, Ausaging, Q+T,etc 314
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0) N/mm2
Creep rupture strength
(10000h)
(Rp1,0) N/mm2
526 973 277

Equivalent Products

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