Product Description

4J33 alloy rod is a Fe-Ni-Co controlled expansion alloy containing about 33% nickel and cobalt. It is specially developed for applications requiring stable thermal expansion to match materials such as ceramics or glass.

This alloy combines good mechanical properties, excellent machinability, and stable expansion behavior, making it widely used in electronic packaging, vacuum devices, and precision instruments.

Key Features

• Fe-Ni-Co controlled expansion alloy

• Stable thermal expansion coefficient

• Excellent hermetic sealing performance with glass/ceramic

• Good processability and weldability

• Available in rods, wires, sheets, and customized forms

Typical Applications

• Electronic packaging and sealing

• Glass-to-metal and ceramic-to-metal seals

• Precision electronic components

• Vacuum tubes and relay parts

• Aerospace and instrumentation industry

Chemical Composition (%)

Physical and Performance Properties

Available Specifications

Huona (Shanghai) New Material Co., Ltd. Was established in 2008, currently have three divisions: Magnesium Division, Thermal Spray Division and Functional Material Division.

Magnesium Division produces magnesium metal products. Various models of high-quality magnesium alloy plate, magnesium rods, high-purity magnesium, magnesium plate, magnesium die casting, magnesium extrusion profiles and other metal magnesium and deep processing products.

Thermal spray wire Division offers a wide variety of pure metal and metal alloy wires, including nickel-, iron-, aluminum-, and zinc-based wires for thermal spray projects.

Fuctional Material Division supply electronic packaging COMPONENTS(GTMS, CTMS), soft magnetic alloys and bimetal strip.

Our company is certified by ISO9001 quality system and ISO14001 environmental protection system.

Mission Statement

We try our best to understand and utilize information within the environment. With this competency, we assist customers to create added value and contribute to the development of industry and healthy living.

We strive for "Best, " welcome challenges, and are relentless till we deliver products and solutions.