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Glass Metal Seal ASTM F30 FeNi52 Low Expansion Alloy Wire

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Glass Metal Seal ASTM F30 FeNi52 Low Expansion Alloy Wire

Brand Name : OHMALLOY

Model Number : Ohmalloy-FeNi52

Certification : ASTM F30

Place of Origin : China

MOQ : 20kg

Payment Terms : T/T, L/C, Western Union

Packaging Details : Wooden-Case

Material : Alloy52

Type of Material : Precision Alloy

Diameter : 0.05mm~10mm

Package : Spool&Coil

Coil Weight : 5~50kg

Common name : FeNi52

Application : Glass Metal Seal

Chemistry : Fe,Ni Alloy

Alloy type : Expansion Alloy

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ASTM F30 / Nickel Alloy 52 / N52 / Niloy52 Low Expansion Alloy Wire

Product Description
The iron-nickel fixed expansion alloy is a series of fixed expansion alloys that can be matched with soft glass and ceramics with different expansion coefficients in a given temperature range by adjusting the nickel content. The expansion coefficient and Curie point increase with the increase of nickel content. This combination gold is a widely used sealing structure material in the electric vacuum industry

Chemical Composition

Alloy52Max 0.05Max 0.020Max 0.020Max 0.80Max 0.30///51.5~52.5/Bal.


GradeCommon NameCommon Name
Alloy52Vacodil520NILO 52

Physical Properties

Alloy528.25 g/cm30.43

Grain size of Alloy52
The grain size of the alloy deep-drawing belt should not be less than level 7, and the grain size less than level 7 should not exceed 10% of the area. When the average grain size of the strip with a thickness of less than 0.13mm is estimated, the number of grains along the thickness of the strip should be no less than 8.

Welding performance of Alloy52
The combined gold has good welding performance and can be brazed and spot welded. The combination of gold and soft glass should be pre-oxidized before sealing.

Coefficient of Expansion

AlloyLinear Coefficient of Thermal Expansion a,10-6/°C

Heat Treatment For Alloy52
(1) Stress relief annealing In order to eliminate the residual stress of parts after machining, stress relief annealing is required: 430~540℃, heat preservation 1~2h, furnace cooling or air cooling. [1]
(2) Intermediate annealing In order to eliminate the work hardening phenomenon caused by the alloy in the process of cold rolling, cold drawing and cold stamping, in order to facilitate the continued processing. The workpiece needs to be heated to 700~800℃ in a vacuum or protective atmosphere for 30~60min, then furnace cooled, air cooled or water quenched.
(3) Pre-oxidation treatment When the combined gold is used as a sealing material, it should be pre-oxidized before sealing. A uniform and dense oxide film is formed on the surface of the alloy. The parts are heated in saturated wet hydrogen at 1100°C for 30 minutes, and then oxidized in the air at about 800°C for 5-10 minutes. The weight gain of the parts should be 0.1~0.3mg/cm2

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FeNi52 Low Expansion Alloy Wire


ASTM F30 Low Expansion Wire


Glass Metal Seal FeNi52 Wire

Quality Glass Metal Seal ASTM F30 FeNi52 Low Expansion Alloy Wire for sale

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