• Wuxi Jinlai Mechanical Processing Co., Ltd.
    John Fairbank
    stainless steel strip with good quality and the Sales clerk service is very good.i like this company i hope can work with your again
  • Wuxi Jinlai Mechanical Processing Co., Ltd.
    Shipment speed is very fast, and the requirements can meet me. Salesman is very responsible.
  • Wuxi Jinlai Mechanical Processing Co., Ltd.
    Fierce Urchin
    good ,the galvanized steel coil quality is good and i donot see the broken on them.that is nice
Contact Person : Jo Yuan
Phone Number : +86-18706170710
WhatsApp : +8618706170710

4J29 Kovar Capillary Tube 4J50 Alloy Steel Products

Place of Origin: CHINA
Brand Name: JIN LAI
Certification: ISO
Model Number: 4J32/4J36/4J38/4J40
Minimum Order Quantity: 5 ton
Price: negotiable based on the quantity
Packaging Details: Standard seaport packing or as custom request
Delivery Time: 10-30 days
Payment Terms: T/T, Western Union, L/C
Supply Ability: 6000 tons per month
Product Details
Grade: Precision Alloy Material: 4J50
Resistance (μΩ.m): Low Elongation (≥ %): As Standards
Ni (Min): As Standards Technique: Cold Rolled Hot Rolled
Shape: Ring,pipe,tube,plate,cake,wire,ect Surface: Black Surface Or Bright Surface
Application: Many Kinds Of Industry Field
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4J50 Alloy Steel Products


4J29 Alloy Steel Products


4J29 steel capillary tube

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Product Description

4J29 ( Kovar ) 4J32 4J33 4J34 4J36(Invar ) 4J50 Capillary Tube

Kovar/4J29 Alloy Material
Kovar/4J29/UNS K94610/W.Nr.1.3912

Kovar is a Nickel-Cobalt-Iron alloy that has compatible thermal expansion characteristics to Borosilicate Glass. This property allows Kovar to maintain a mechanical connection to the glass over a range of temperatures. Etched Kovar parts are commonly used for step lids, carriers, covers and electronic shims.


Kovar/4J29 Alloy Material Chemical Composition %

  C Si Mn P S Ni Fe Cu Cr Co Mo
Max 0.03 0.3 0.5 0.02 0.02 28.5/29.5 bal 0.2 0.2 16.8/17.8 0.2


Kovar/4J29 Mechanical property & Physical properties:

Yield Strength(Mpa) Tensile Strength(Mpa) Elongation(%) Hardness(HRC) Density
344 517 30% 78HB 8.36g/cm^3


Supply scope

Wire: Φ0.06∼10mm Surface: Bright and oxidation
Bar: Φ12∼200mm Surface: Bright and oxidation
Sheet: δ=1∼20*15∼350mm

Coefficient of Thermal Expansion (Nominal):


20-200 20-300 20-400 20-450 20-500 20-600 20-700 20-800
10^-6/℃ 5.9 5.3 5.1 5.3 6.2 7.8 9.2 10.2



Kovar/4J29 Applied field:

1.Kovar alloy has been used for making hermetic seals with the harder Pyrex glasses and ceramic materials.


2.This alloy has found wide application in power tubes, microwave tubes, transistors and diodes. In integrated
circuits, it has been used for the flat pack and the dual-in-line package


1. What's the minimum quantity customer can order?
If we have your size in stock, we can provide any quantity you want.
If the size is not in stoct, our MOQ will be about 30kgs.

2. Customer do not have express account. How will us arrange the delivery for sample order?
Just need to provide your address information, we will check the express cost, you can arrange the express cost together with sample value.


3.What's our payment terms?
We can accept LC T/T payment terms, it also depending on delivery and total amount. Let's talk more in details after getting your detailed requirements.


4.Do you provide free samples?
If you want several meters and we have stock of your size, we can provide, customer need to bear the International express cost.


5.What's our working time?
We will give you reply through email/phone Online contact tool within 24 hours. No matter working day or holidays.


4J29 Kovar Capillary Tube 4J50 Alloy Steel Products 0