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UNS Kovar Details

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

Category Type Grade Microstructure Designations
Grades Stainless Steels Kovar Precipitation-Hardening USA - UNS , SAE AMS 7728H (2000) - Iron-Nickel-Cobalt Alloy, Sheet, Strip, and Plate, 53Fe - 29Ni - 17Co, Low Expansion Glass Sealing, Annealed

Chemical composition(wt.%) of Kovar grade: 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
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)
783 (≥) 122 (≥) 23 41 12 Solution and Aging, Annealing, Ausaging, Q+T,etc 344

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
888 (≥) 834 (≥) 14 23 34 Solution and Aging, Annealing, Ausaging, Q+T,etc 132
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0) N/mm2
Creep rupture strength
(10000h)
(Rp1,0) N/mm2
477 334 447

Kovar - Form of Supply

Product type Products Dimension Processes Deliver Status
Plates / Sheets Plates / Sheets 0.08-200mm(T)*W*L Forging, hot rolling and cold rolling Annealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting
Steel Bar Round Bar, Flat Bar, Square Bar Φ8-1200mm*L Forging, hot rolling and cold rolling, Cast Black, Rough Turning, Shot Blasting,
Coil / Strip Steel Coil /Steel Strip 0.03-16.0x1200mm Cold-Rolled & Hot-Rolled Annealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting
Pipes / Tubes Seamless Pipes/Tubes, Welded Pipes/Tubes OD:6-219mm x WT:0.5-20.0mm Hot extrusion, Cold Drawn, Welded Annealed, Solution and Aging, Q+T, ACID-WASHED

Cross Reference Table(Equivalent Grade)

Grade Standard Country Application
Kovar ASTM USA
Iron-Nickel-Cobalt Alloy, Wire 53Fe - 29Ni - 17Co Low Expansion, Glass Sealing, Annealed
Kovar ASTM USA
Iron-Nickel-Cobalt Alloy, Bars and Forgings, 53Fe - 29Ni - 17Co, Low Expansion, Glass Sealing
Kovar ASTM USA
Iron-Nickel-Cobalt Alloy, Sheet, Strip, and Plate, 53Fe - 29Ni - 17Co, Low Expansion Glass Sealing, Annealed
Kovar UNS USA
Iron-Nickel-Cobalt Alloy, Wire 53Fe - 29Ni - 17Co Low Expansion, Glass Sealing, Annealed
Kovar UNS USA
Iron-Nickel-Cobalt Alloy, Bars and Forgings, 53Fe - 29Ni - 17Co, Low Expansion, Glass Sealing
Kovar UNS USA
Iron-Nickel-Cobalt Alloy, Sheet, Strip, and Plate, 53Fe - 29Ni - 17Co, Low Expansion Glass Sealing, Annealed
Kovar UNS USA
Iron-Nickel Alloys for Sealing to Glasses and Ceramic
Kovar UNS USA
Wrought Nickel and Nickel-Related Alloys

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