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4J32 Rod Controlled Expansion Alloy Bar Fe Ni Alloy for Glass and Ceramic Sealing

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Huona (Shanghai) New Material Co., Ltd.

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4J32 Rod Controlled Expansion Alloy Bar Fe Ni Alloy for Glass and Ceramic Sealing

Name: 4J32 Rod Controlled Expansion Alloy Bar Fe Ni Alloy for Glass and Ceramic Sealing
Brand: HUONA
Price: 1 USD

Brand Name : HUONA

Model Number : 4J32

Certification : ISO 9001, SGS, RoHS

Place of Origin : china

MOQ : 1kg

Price : negotiation

Payment Terms : T/T

Supply Ability : 10000kg/week

Delivery Time : a week

Packaging Details : Wooden case, steel strip bundling

Diameter : 3 mm – 200 mm

Length : ≤ 6000 mm

Tolerance : As per ASTM / GB standard

Surface : Bright / Polished / Black

Thermal Expansion (20–400°C) : ~4.5 ×10⁻⁶/°C

Tensile Strength : ≥ 450 MPa

Working Temp : -196°C to 450°C

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Product Description

4J32 alloy rod is a Fe-Ni controlled expansion alloy, specially designed for glass-to-metal and ceramic-to-metal sealing applications. Its thermal expansion coefficient closely matches that of certain hard glasses and ceramics, ensuring excellent hermeticity and reliability.

This alloy offers good machinability, stable thermal expansion performance, and reliable mechanical properties, making it widely used in semiconductor packaging, vacuum devices, relays, sensors, aerospace instruments, and electronic components.

Key Features

Fe-Ni controlled expansion alloy
Excellent thermal expansion match with ceramics & hard glass
Superior hermetic sealing capability
Stable mechanical strength across working temperature range
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, electronic tubes
Aerospace and defense components
Vacuum electronic devices

Chemical Composition (%)

Element	Content
Fe	Balance
Ni	~32%
Mn, Si, C, etc.	Minor

Physical and Performance Properties

Property	Typical Value
Density	~8.1 g/cm³
Thermal Expansion (20–400°C)	~4.5 ×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)

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