China 4J46 Rod Controlled Expansion Alloy Bar Fe Ni Alloy for Glass and Ceramic Sealing Manufacture and Factory

4J46 Rod Controlled Expansion Alloy Bar Fe Ni Alloy for Glass and Ceramic Sealing

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Product Description

4J46 alloy rod is a Fe-Ni controlled expansion alloy with about 46% nickel, designed for glass-to-metal and ceramic-to-metal sealing applications. Its thermal expansion coefficient matches that of hard glass and ceramics, ensuring excellent hermetic sealing and reliability.

This alloy features stable expansion characteristics, good machinability, and high sealing performance, making it widely applied in semiconductor packaging, vacuum tubes, relays, sensors, aerospace devices, and precision electronic components.

Density: 8.2 g/cm³

Thermal Expansion (20–400°C): 5.0 ×10⁻⁶/°C

Tensile Strength: 450 MPa

Hardness: HB 130–160

Certification: ISO 9001, SGS, RoHS

Surface: Bright / Polished / Black

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Key Features

Fe-Ni controlled expansion alloy (Ni ~46%)
Excellent sealing with ceramics and hard glass
Reliable thermal expansion stability
Good machinability and polishability
Supplied in rods, wires, sheets, customized forms

Typical Applications

Glass-to-metal sealing
Ceramic-to-metal sealing
Semiconductor packaging bases
Relays, sensors, vacuum tubes
Aerospace and defense electronic devices
Hermetic sealing in precision instruments

Chemical Composition (%)

Element	Content
Fe	Balance
Ni	~46%
Mn, Si, C, etc.	Minor

Physical and Performance Properties

Property	Typical Value
Density	~8.2 g/cm³
Thermal Expansion (20–400°C)	~5.0 ×10⁻⁶/°C
Tensile Strength	≥ 450 MPa
Hardness	~HB 130–160
Working Temp	-196°C to 450°C
Standard	GB/T, ASTM, IEC

Available Specifications

Item	Range
Diameter	3 mm – 200 mm
Length	≤ 6000 mm
Tolerance	As per ASTM / GB standard
Surface	Bright / Polished / Black
Packaging	Wooden case, steel strip bundling
Certification	ISO 9001, SGS, RoHS
Origin	China (OEM/ODM service available)