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UNS Kovar Details
UNS Kovar Standard Download
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 |
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) |
|---|---|---|---|---|---|---|
| 832 (≥) | 394 (≥) | 12 | 12 | 12 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 232 |
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 |
|---|---|---|---|---|---|---|---|
| 749 (≥) | 157 (≥) | 33 | 12 | 23 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 221 | |
| Temp. °C/°F |
Creep strain limit (10000h) (Rp1,0) N/mm2 |
Creep rupture strength (10000h) (Rp1,0) N/mm2 |
|||||
| 523 | 971 | 889 |
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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