4J38

Other

Chinese precision-alloy designation system: 1J soft magnetic, 2J magnetic (hard magnetic / magnet alloys), 3J elastic alloys, 4J controlled-expansion/soft alloys, 5J bimetals, 6J resistance alloys. 4J38 is a controlled-expansion/sealing precision alloy (4J series).

Chemical Composition (%)

INVAR + CU	35

Mechanical Properties

Thermal expansion coefficient 0.5-9.0 x10^-6 /K (grade dependent, low-expansion/sealing)

Chinese Standard

GB/T 15018-1994

Applications

Glass/ceramic sealed headers, precision instruments, low-expansion structures

Available Forms

Strip, wire, bar, sheet, rod, tube

Uses

Electronic tube seals, thermostats, precision measuring devices

Heat Treatment

Per family: 1J soft magnetic annealed in H2; 2J magnet aged; 3J elastic solution+age; 4J expansion controlled anneal; 6J resistance annealed

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