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Precision alloy ni29co18 iron nickel cobalt kovar 29 4J29 4j33 4j34 invar 4j36 wire foil
Kovar 4J29
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Precision alloy ni29co18 iron nickel cobalt kovar 29 4J29 4j33 4j34 invar 4j36 wire foil
Glass sealed and controlled expansion Kovar alloys
* kovar alloy, ASTM F15, Nilo-K, UNS K94610 (FeNi29Co17), Chinese 4J29
* Specifications: ASTM F15; DIN 17745; S.E.W. 385; Werkstoff Nr. 1.3981; AFNOR NF A54-301
Kovar Alloy, also know as ASTM F-15, NILO K, Pernifer 2918, Rodar, and Dilvar P1 is Nickel-Iron-Cobalt, controlled expansion alloy containing 29% Nickel.
It's coefficient of expansion (which decreases with rising temperature to the inflection point), matches the expansion rate of borosilicate glasses and aluminia ceramics.
Applications include glass to metal seals in applications requiring high reliability or resistance to thermal shock, ie. high~power transmitting valves, transistor leads and heaters and photography flash bulbs.
| Item | 1J33 | 3J01 | 3J9 | 4J29 | 4J32 | 4J33 | 4J45 | FeNi50 | Invar36 |
| C | ≤0.05 | ≤0.05 | 0.22-0.26 | ≤0.03 | ≤0.05 | ≤0.03 | ≤0.05 | ≤0.05 | ≤0.1 |
| Mn | 0.30-0.6 | ≤1.00 | 1.80-2.20 | ≤0.5 | 0.2-0.6 | ≤0.5 | ≤0.8 | ≤0.8 | ≤0.5 |
| Fe | Rest | ||||||||
| P | ≤0.020 | ≤0.020 | ≤0.03 | ≤0.02 | ≤0.02 | ≤0.02 | ≤0.02 | ≤0.02 | ≤0.006 |
| S | ≤0.020 | ≤0.020 | ≤0.020 | ≤0.02 | ≤0.02 | ≤0.02 | ≤0.02 | ≤0.02 | ≤0.04 |
| Si | 0.30-0.6 | ≤0.80 | 1.30-1.70 | ≤0.3 | ≤0.2 | ≤0.3 | ≤0.3 | ≤0.3 | ≤0.35 |
| Ni | 32.8-33.8 | 34.5-36.5 | 9.0-10.5 | 28.5-29.5 | 31.5-33 | 28.5-29.5 | 44.5-45.5 | 49.5-50.5 | 35-38 |
| Al | 1.0-2.0 | 1.00-1.80 | -- | -- | -- | -- | ≤0.1 | ≤0.1 | -- |
| Co | -- | -- | -- | 16.8-17.8 | 3.2-4.2 | 16.8-17.8 | -- | -- | -- |
| Ti | -- | 2.70-3.20 | -- | -- | -- | -- | -- | -- | -- |
| Cu | -- | -- | -- | ≤0.2 | 0.4-0.8 | ≤0.2 | -- | -- | -- |
| Cr | -- | 11.5-13.0 | 19.0-20.5 | ≤0.2 | -- | ≤0.2 | -- | -- | -- |
| Mo | -- | -- | 1.60-1.85 | ≤0.2 | -- | ≤0.2 | -- | -- | -- |
| Alloy Type | Trade Name | UNS No. | Specifications | Forms Of Supply | |||
| Rod | Strip | Wire | Sheet | ||||
| Ni29Co17 | Kovar | K94610 | ASTM F15 | √ | √ | √ | √ |
| FeNi36 | Invar 36 | K93603 | ASTM 1684 | √ | √ | √ | |
| FeNi32Co5 | Super Invar 32-5 | KI93500 | ASTMF1684 | √ | √ | √ | |
| FeNi27Co25 | Ceramvar | F1466 | ASTMF1466 | √ | √ | √ | √ |
| FeNi42 | Alloy 42 | K94100 | ASTM F30 | √ | √ | √ | |
| FeNi46 | Alloy 46 | K94600 | ASTM F30 | √ | √ | √ | |
| FeNi48 | Alloy 48 | K94800 | ASTMF30 | √ | √ | √ | |
| FeNi50 | Alloy 52 | K95050 | ASTM F30 | √ | √ | √ | √ |
