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4J33 Ceramic Thermal Expansion Alloy Porcelain Sealed Per YB/T 5234-1993

Place of Origin China
Brand Name XUNSHI
Certification ISO9001
Model Number 4J33
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 Grade KV-4 Forms Of Supply Bar, Forging, Tube, Plate, Strip
Density 8.27 Resistance Rate 0.46 μΩ·m
Curie Point 440°C Product Name Controlled Expansion Alloy
High Light

iron nickel alloy


thermal expansion nickel

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Product Description

4J33 Porcelain Sealed Controlled Expansion Alloy per YB/T 5234-1993



4J33 is a ceramic sealing alloy developed in combination with the characteristics of China's ceramics. 4J33 ceramic sealing alloy is mainly used for matching sealing with ceramics. It is an important sealing structure material in electric vacuum industry.


4J33 alloy has a linear expansion coefficient similar to that of 95%Al2O3 ceramics in the temperature range of -60~600 C.


Curie temperature: 440 degrees C



The alloy has good cold and hot processing properties, and can be made into various complicated parts. Do not heat the material in a sulphur atmosphere.


Before sealing with ceramics, the parts should be annealed, cleaned, nickel-plated, and then welded with silver to the ceramics after metallization.


4J33 has good electroplating properties, and the surface can be plated with gold, silver, nickel, chromium and other metals.


The cutting and processing properties of 4J33 are similar to those of austenitic stainless steels. High speed steel or carbide tools are used for processing. Low speed machining. Coolant can be used in cutting.


4J33 has good grinding performance.


Chemical composition

Grade C Mn Si P S Ni Co Fe
4J33 0.05 0.50 0.30 0.020 0.020 32.0~33.6 14.0~15.2 Rem
4J34 0.05 0.50 0.30 0.020 0.020 28.5~29.5 19.5~20.5 Rem