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4J50 Controlled Expansion Iron Nickel Alloy , Forging Ceramics Glass Sealing Alloy

Place of Origin China
Brand Name XUNSHI
Certification ISO9001
Model Number 4J50
Minimum Order Quantity 50kg
Price Negotiable
Packaging Details Plywood case
Delivery Time 30-35 days
Payment Terms T/T
Supply Ability 500kg per week

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Product Details
Equal Grades FeNi50, Nilo51, N50 Spec YB/T 5235-1993
Density 8.21g/cm3 Resistance Rate 0.44μΩ·m
Forms Of Supply Wire, Strip, Tube, Capillary, Rod, Round Bar, Forging Product Name Controlled Expansion Alloys
High Light

thermal expansion nickel


corrosion resistant alloys

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Product Description

4J50 Iron Nickel Controlled Expansion Alloy for Glass and Ceramics Sealing



4J50 is used in glass-to-metal seals for some of the soft glasses and some ceramics. Produced with good machining properties, it’s manufactured in a controlled environment under controlled conditions.



YB/T 5235-1993  Sealed Iron-Nickel-Chromium, Iron-Nickel Alloys Technical Requirements


Chemical composition

Element C Mn Si P S Al Co Ni Fe
Weight(%) 0.05 max 0.80 max 0.30 max 0.020 max 0.020 max 0.10 max 1.0 max 49.5~50.5 Rem



4J50 is mainly used to make precision impedance diaphragm, wet spring relay, dry spring relay, and the corresponding soft glass sealing for precision length measurement.


Liner expansion rate(10-6/°C)

20~300°C  9.2~10.0

20~400°C  9.2~9.9