Alloy K / Kovar is available in Alloy K / Kovar wire, Alloy K / Kovar Round bar, Alloy K / Kovar Forged bar, Alloy K / Kovar hex bar, Alloy K / Kovar Flat bar, Alloy K / Kovar Circles, Alloy K / Kovar Ring, Alloy K / Kovar Tube, Alloy K / Kovar seamless Pipe, Alloy K / Kovar Welded / ERW Pipe, Alloy K / Kovar Sheet, Alloy K / Kovar Plate, Alloy K / Kovar Coil, Alloy K / Kovar Flanges, Alloy K / Kovar fasteners, Alloy K / Kovar Socket weld Fittings, Alloy K / Kovar ferrule fittings, Alloy K / Kovar Buttweld fittings like cap, elbow, tee, Reducer. For all stock availability contact Sales.
| Alloy Name | Trade Name | UNS No. | American Specs | German Specs | French Specs |
| Alloy K | Kovar Nilo-K Rodar |
UNS K94610 | ASTM F15 ASTM F26 AMS 7726 Wire AMS 7727 Bar and Forgings AMS 7728 Sheet, Strip and Plate MIL-I-23011 Class 1 |
Werkstoff 1.3981 | AFNOR NF A54-301 |
| Kovar Chemical Composition (Basic Density 8.36) | |||||||||||||
| Weight% | Ni | Fe | Co | C | Mn | Si | Al | Cr | Mg | Zr | Ti | Cu | Mo |
| Alloy K Kovar |
29.0 | 53.0 | 17.0 | 0.04 max | 0.50 max | 0.20 | 0.10 max | 0.20 max | 0.10 max | 0.10 max | 0.10 max | 0.20 max | 0.20 max |
Kovar (Alloy K) is a nickel-iron-cobalt controlled-expansion alloy containing 29% nickel. Its coefficient of expansion, which decreases with rising temperature to the inflection point, matches the expansion rate of borosilicate glasses and alumina ceramics. Kovar (Alloy K) is used for glass-to-metal seals in applications requiring high reliability or resistance to thermal shock. Kovar (Alloy K) is used for high-power transmitting valves, transistor leads and headers, integrated-circuit lead frames, and photography flash bulbs.
| Material | Condition | Yield Strength (0.1% Offset) | Tensile Strength | Elongation % | ||
| psi | MPa | psi | MPa | |||
| Alloy K Kovar |
Annealed | 49,000 | 340 | 75,000 | 520 | 42 |
Specifications
UNS K94610
Werkstoff Nr 1.3981
DIN 17745
ASTM F 15
AMS 7726 Wire
AMS 7727 Bars and Forgings
AMS 7728 Sheet, Strip and Plate
MIL-I-23011 class 1
AFNOR NF A54-301
S.E.W 385
DILVER P
Registered Names
Kovar ®
Nicoseal ®
Nicosel ®
Rodar ®
Telcoseal ®
Sealvar ®
Alloy 29-17 ®
Nilo K ®
Dilver ®
Pernifer 29-18 ®
| ASTM 15 Alloy / Kovar Strip - Kovar Coil Thickness | ||
| 0.004 | 0.0142 | 0.045 |
| 0.0045 | 0.0145 | 0.050 |
| 0.005 | 0.015 | 0.059 |
| 0.006 | 0.020 | 0.060 |
| 0.007 | 0.025 | 0.062 |
| 0.008 | 0.030 | 0.064 |
| 0.0098 | 0.035 | 0.070 |
| 0.010 | 0.040 | 0.082 |
| 0.12 | 0.043 | |
| All Coil Slit to Your Width - Other sizes available on request | ||
| ASTM F15 Alloy / Kovar Sheet Cold Rolled Kovar Bright Annealed MIL I 23011C, CL.1 |
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| Thickness | Widths | Lengths | ||
| 0.015 | x | 12, 13, 24" | x | 72 |
| 0.020 | x | 12, 13, 24" | x | 72 |
| 0.025 | x | 12, 13, 24" | x | 72 |
| 0.030 | x | 12, 13, 24" | x | 72 |
| 0.035 | x | 12, 13, 24" | x | 72 |
| 0.040 | x | 12, 13, 24" | x | 72 |
| 0.050 | x | 12, 13, 24" | x | 72 |
| 0.060 | x | 12, 13, 24" | x | 72 |
| 0.062 | x | 12, 24" | x | 72 |
| 0.072 | x | 12, 24" | x | 72 |
| 0.075 | x | 12, 24" | x | 72 |
| 0.080 | x | 12, 24" | x | 72 |
| 0.090 | x | Random Width | x | 72 |
| 0.092 | x | Random Width | x | 72 |
| 0.100 | x | Random Width | x | 72 |
| 0.115 | x | Random Width | x | 72 |
| 0.125 | x | Random Width | x | 72 |
| other sizes available upon request | ||||
| ASTM F15 Alloy / Kovar Coil | |
| 0.004 x 12 x coil | 0.0125 x 12 x coil |
| 0.0045 x 12 x coil | 0.0142 x 12 x coil |
| 0.005 x 12 x coil | 0.0145 x 12 x coil |
| 0.006 x 12 x coil | 0.015 x 12 x coil |
| 0.007 x 12 x coil | 0.020 x 12 x 72 |
| 0.008 x 12 x coil | 0.025 x 12 x 72 |
| 0.0095 x 12 x coil | 0.030 x 12 x 72 |
| 0.010 x 12 x coil | |
| other sizes available upon request | |
| ASTM F15 / Kovar Plate- Hot Rolled Kovar / MIL I 23011C Class 1 Ni/ Iron / Cobalt Alloy |
|
| 0.150 x 15 x 72 | 0.500 x 15 x 72 |
| 0.164 x 15 x 72 | 0.515 x 15 x 72 |
| 0.187 x 15 x 72 | 0.540 x 15 x 72 |
| 0.210 x 15 x 72 | 0.587 x 15 x 72 |
| 0.235 x 15 x 72 | 0.625 x 15 x 72 |
| 0.250 x 15 x 72 | 0.687 x 15 x 72 |
| 0.260 x 15 x 72 | 0.700 x 15 x 72 |
| 0.281 x 15 x 72 | 0.750 x 15 x 72 |
| 0.312 x 15 x 72 | 0.850 x 15 x 72 |
| 0.320 x 15 x 72 | 0.860 x 15 x 48 |
| 0.375 x 15 x 72 | 0.875 x 15 x 48 |
| 0.390 x 15 x 72 | 1.00 x 15 x 31 |
| 0.400 x 15 x 72 | 1.50 x 15 x 31 |
| 0.425 x 15 x 72 | 2.00 x 15 x 24 |
| 0.437 x 15 x 72 | |
| other sizes also available upon request | |
| ASTM F15 Alloy / Kovar Rod / Bar Certified to -196 °C with no phase transformation |
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| Diameter | |||
| 0.040 | 0.187 | 0.500 | 0.1375 |
| 0.050 | 0.200 | 0.562 | 1.500 |
| 0.060 | 0.203 | 0.625 | 1.625 |
| 0.062 | 0.218 | 0.750 | 1.750 |
| 0.100 | 0.250 | 0.875 | 2.0 |
| 0.125 | 0.312 | 1.0 | 2.125 |
| 0.156 | 0.375 | 1.125 | 2.5 |
| 0.178 | 0.437 | 1.250 | 3.0 |
| Available to 6" Dia Other sizes of Kovar Available upon request |
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Harsh steel is a major stockist and Exporter of Alloy K / Kovar to many countries of the world such as Singapore, Brisbane, Sydney, Melbourne, Australia, Houston, TX, San Diego, San Francisco, Atlanta, USA, Brentford, United Kingdom, Phoenix, Ireland, New Zealand and Canada, Western Australia , Queensland, New South Wales, South Australia, Victoria, Australian Capital Territory, Tasmania, Northern Territory, Ontario, British Columbia, Yukon Territory, Alberta, Manitoba, Saskatchewan, Newfoundland, Prince Edward Island, New Brunswick, Nova Scotia, Eastern Cape, Gauteng, Kwazulu-Natal, Western Cape, England, Scotland, Wales, Northern Ireland, Lagos, Abuja Capital Territory, Vadodara, Mumbai, Chennai, New Delhi, Mahape, Gurgaon, Noida, Bangalore, Coimbatore, Cochin, Ash Sharqiyah, Ar Riyad, Makkah, Dhahran, Riyadh, Jiddah, Jeddah, Masqat, Kwazulu-Natal, Gauteng, Western Cape, Free State, Eastern Cape, Alberta, Saskatchewan, British Columbia, Newfoundland, New Brunswick, Manitoba, Ontario, Nova Scotia, Quebec, Calgary, Edmonton, Vancouver, Toronto, Birmingham, Brentford, Manchester, Bristol, Sheffield, Milton Keynes, London, Poplar, Edinburgh, Thames Ditton.