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UNS Kovar Details
Iron-Nickel-Cobalt Alloy, Sheet, Strip, and Plate, 53Fe - 29Ni - 17Co, Low Expansion Glass Sealing, Annealed
UNS Kovar Standard Download
Kovar Datasheet
UNS Kovar| 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 |
| 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 |
| 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) |
|---|---|---|---|---|---|---|
| 139 (≥) | 342 (≥) | 12 | 23 | 33 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 423 |
| 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 |
|---|---|---|---|---|---|---|---|
| 911 (≥) | 667 (≥) | 32 | 42 | 21 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 231 | |
| Temp. °C/°F |
Creep strain limit (10000h) (Rp1,0) N/mm2 |
Creep rupture strength (10000h) (Rp1,0) N/mm2 |
|||||
| 253 | 186 | 791 |
| 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 |
| 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 |