4j29 kovar alloy bar nico2918 ni29co18 29nk sealing glass kovar alloy 4j29 kovar rod
| Chemical Compsition Wt.% | Super 1J22 1J36 4J29 4J33 4J36 round Precision alloy invar 4J32 |
| C≤0.05 | |
| Mn.0.2-0.6 | |
| Si≤0.20 | |
| P≤0.020 | |
| S≤0.020 | |
| Cu.0.4-0.8 | |
| Ni.31.5-33.0 | |
| Co.3.2-4.2 | |
| Fe.balance |
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