• Suzhou Xunshi New Material Co., Ltd
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Phone Number : +86 18112628895
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42Ni-6Cr Expansion Alloy 4J6 Stip Rod Pipe Tube Forms ASTM F31

Place of Origin China
Brand Name XUNSHI
Certification ISO9001:2015
Model Number 4J6
Minimum Order Quantity 300 kg
Price Negotiable
Packaging Details Plywood case
Delivery Time 30-35 days
Payment Terms T/T
Supply Ability 5000kg per week

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Product Details
Equal Grade 42Ni-6Cr ,Carpenter 42-6 ,Sylvania4 ,Sealmet Forms Of Supply Strip, Plate, Rod,pipe, Tube
Sepc YB/T 5253-2005, ASTMF31-16(Glass Sealing 42-6) Density 8.11g/cm3
Product Name Expansion Alloy Certification ISO9001:2015
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42Ni-6Cr Expansion Alloy


4J6 Expansion Alloy


4J6 Controlled Expansion Alloys

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Product Description

42Ni-6Cr Expansion Alloy 4J6 Stip Rod Pipe
4J6 is a typical glass sealing alloy, the coefficient of expansion is similar to the soft glass in the temperature range of 20~400℃. The alloy contains 6% chromium, and after oxidation treatment the alloy surface produces a very dense oxide membrane that is strongly bound to the substrate and well infiltrated with the soft glass, so that can get high strength sealing surface.
The alloy 4j6 contains 42% nickel, that is why the US label is called the 42Ni-6Cr (Glass sealing 42-6, UNSK94760). US Carpenter also produced the alloy called Carpenter 42-6 .
Equal Grades

Grade Russia America Japan France Germany







Sealmet 4









Chemical composition(%)


Grade C P S Mn Si Al Ni Cr Fe
4J6 ≤0.05





≤0.20 41.5~42.5 5.40~6.30 Balance



≤0.07 ≤0.025 ≤0.025 ≤0.25 ≤0.30 ≤0.20 41.0-43.0 5.0-7.0 Balance


Physical performance


Grade Heat treatment Average line coefficient of expansion(10-6/°C)
20-300°C 20-400°C 20-450°C
4J6 Heat to 1100 °C ± 20 °C in a vacuum or hydrogen atmosphere and temperature insulation for 15 minutes, then cooling down to below 200 °C for no more than 5 °C / minutes 7.6-8.3 9.5-10.2 -

Typical expansion coefficient

Temperature range(°C) 20-100 20-100 20-300 20-400 20-450 20-500 20-600
Average coefficient of linear expansion (μm/m·°C) 6.8 7.0 7.7 9.7 - 11.1 12.2

Density: 8.11g/cm3


  • ASTM F31-16(Glass sealing 42-6)
  • YB/T 5253-2005

The alloy has stable performance and used by the aviation factories long term.It is mainly used to make various electric vacuum components, such as the anode cap of the electronic beam tube, the vacuum display screen and so on.


Available forms
Stip,Rod,pipe ,plate and tube
Our 4J6 precision strips were exported to the United States to a well-known air headphones and hearing aid manufacturer. The product quality was won the trust of international customers.
42Ni-6Cr Expansion Alloy 4J6 Stip Rod Pipe Tube Forms ASTM F31 042Ni-6Cr Expansion Alloy 4J6 Stip Rod Pipe Tube Forms ASTM F31 142Ni-6Cr Expansion Alloy 4J6 Stip Rod Pipe Tube Forms ASTM F31 242Ni-6Cr Expansion Alloy 4J6 Stip Rod Pipe Tube Forms ASTM F31 3



Suzhou Xunshi New Material Co. Ltd- referred as XUNSHI hereafter, is a professional manufacturer of high-performance alloy products. XUNSHI is engaged in supplying high quality and cost-effective Superalloy, Anti-Corrosion Alloy, Precision Alloy, Special Stainless Steel and Magnetostrictive Material to customers worldwide.



· Highly experienced in alloy industry

· Top experts of industry in China

· Advanced technology and process from top famous institutes in China

· Advanced devices through whole production and inspection process

· Strict quality control system

· Company motto: best service, most value

· Smart sales policy


Service Items of XUNSHI

· Non-standard product research and pre-production

· Fabrication of products

· Cutting, splitting for sheets and plates in stock

· Heat treatment (Solution treatment, aging harden treatment, anneal, spring temper, quench etc.)

· Surface finish (peeling, gridding, polishing)

· Logistics service

· Customized packing service (also for exporting)

· Import and export (XUNSHI is certificated)

· Document translation

· Hard-to-find material sourcing


Customers of XUNSHI

Customers of XUNSHI are all over China (Taiwan and Hong Kong included). And we are exporting to USA, Canada, Italy, UK, Poland, Greece, Russia, Turkey, Iran, Israel, South Africa, South Korea, North Korea, India, Argentina, and Brazil and so on. Customers from 30+ countries trust us.


Where is XUNSHI

A- XUNSHI is in Huaqiao, Kunshan, 215332 China, which is very closed to Shanghai.

B- Xunshi is around 80KM from Shanghai Pudong International Airport (PVG).

C- 20KM from Shanghai Hongqiao Airport

D- 20KM from Shanghai Hongqiao Railway Station

E- You can contact XUNSHI sales for a pickup service.