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Precision alloys are metal materials with special physical properties (such as magnetic , electrical , and thermal properties) . The vast majority of precision alloys are based on ferrous metals , and only a few are based on non-ferrous metals . Usually include magnetic alloys (see magnetic materials ), elastic alloys , expansion alloys , thermal bimetals , electrical alloys , hydrogen storage alloys (see hydrogen storage materials ), shape memory alloys , magnetostrictive alloys (see magnetostrictive materials ),etc.
Precision alloys are divided into 7 categories according to their different physical properties, namely: soft magnetic alloys , deformed permanent magnetic alloys , elastic alloys, expansion alloys, thermal bimetals, resistance alloys , and thermoelectric alloys.
Soft magnetic alloys：Permalloy 80(Mumetal); 1J79(Alloy 79); 1J85(Alloy 85); Hiperco 50A
Elastic alloys：3J58,3J53, 3J01 Eect
Expansion alloys: Kovar Alloy(4J29), Invar 36(4J36), Super Invar (4J32),Alloy 42(4J42), Alloy 50(4J50) Ect
| 4J36 | INVAR | 4J48 | K94800 | |
| 4J42 | K94100 | 4J46 | K94600 | |
| 4J50 | Alloy52 | 1J79 | HyRa80 | |
| 4J29 | KOVAR | 1J85 | Super-permalloy | |
| 4J32 | Super-invar | 1J50 | HyRa50 | |