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Kovar Alloy 4J42

Iron-nickel constant expansion alloys are a series of constant expansion alloys that can match soft glass and ceramics with different expansion coefficients within a given temperature range by adjusting the nickel content. The expansion coefficient and Curie point increase with increasing nickel content.

Classification:

Precision alloy

Keyword: Kovar Alloy 4J42

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1. chemical composition

Name

Kovar Alloy 4J42

Chemical
Composition
Wt.%

Brand

Chemical composition (mass fraction)（%）

4J42

≤0.05

≤0.80

≤0.30

≤ 0.020

≤0.020

≤0.10

41.25~42.5

margin

2. physical properties

Density	8.12 g/cm³
Melting point	1450°C
Coefficient of thermal expansion	5.2×10⁻⁶ /°C (20°C - 400°C)
Specific heat	0.45 J/g·K

3. varieties and specifications

Variety		Specifications
Wire	round wire	F0.15 ~ 13.00mm
Strip	cold rolling	0.15 to 4 × 200mm
Strip	hot rolling	4 to 22 × 200mm
Non-standard can support customization

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Kovar Alloy 4J42