4J52

Product Description:

Iron-nickel fixed expansion alloys are a series of fixed expansion alloys that can match soft glasses and ceramics with different expansion coefficients within a given temperature range by adjusting the nickel content. Their expansion coefficients and Curie points increase with the increase in nickel content. This combination alloy is a sealing structural material widely used in the electric vacuum industry.

Physical properties:

Melting point: 1430℃

Density ρ=8.25g/cm³

Resistivity ρ=0.43μΩ·m

Thermal conductivity λ=16.7W/(m·℃)

Extreme chemical composition:

C: ≤0.05

P: ≤0.02

S: ≤0.02

Mn: ≤0.6

Si: ≤0.3

Ni: 51.5～52.5

Fe: balance

characteristic:

This combination alloy has good welding properties and can be brazed and spot welded；

Within a given temperature range, it has a certain coefficient of linear expansion.

Application areas:

For matching sealing of soft glass or ceramics in the electric vacuum industry

form:

Rod, tube, plate, strip and wire