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Kovar Alloy 4J29

4J29 alloy is also called Kovar alloy. The alloy has a linear expansion coefficient similar to that of silicon boron hard glass at 20~450℃, a high Curie point and good low-temperature structural stability. The alloy's oxide film is dense and can be well infiltrated by glass. It does not react with , and is suitable for use in instruments containing mercury discharge. It is the main sealing structure material for electric vacuum devices.

Classification:

Precision alloy

Keyword: Kovar Alloy 4J29

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1. chemical composition

Name

Kovar Alloy 4J29

Chemical
Composition
Wt.%

Brand

Chemical composition (mass fraction)（%）

4J29

≤0.03

≤0.50

≤0.30

≤0.020

≤0.20

28.5~29.5

16.8~17.8

margin

2. physical properties

Density	8.3g/cm³
Melting point	1420-1455℃

Annealed state, mechanical properties of the alloy at room temperature:

Alloy state

Tensile strength

σb（Mpa）

Yield strength

σ0.2（Mpa）

Elongation A5 %

Hardness HB

4J29

≥450

≥350

≥25

≤190

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 4J29