Kv-4 Alloy Wire an Important Sealing Structural Material in The Electric Vacuum

• Product Type: Wire
• Material: Feni Alloy
• Carbon Content: No
• PCD: No
• ET: No
• Hole: No
• Certificate: SGS, ISO, RoHS
• Sample: Free Sample
• Resistivity(μΩ.M): 0.46
• Density, g/cm3: 8.2
• Surface Treatment: Bright or Oxidation
• Width: 9~250 mm
• Application: Sealing Material
• Elastic Modulus, E/ Gpa: 139
• Temperature Factor of Resistivity: 3.7~3.9
• Curie Point Tc/ ºC: 440
• Transport Package: Coil+ Waterproof Paper+ Wooden Case
• Specification: Diameter: 0.1~5.0 mm
• Trademark: Ohmalloy
• Origin: Shanghai, China
• HS Code: 7505220000
• Production Capacity: 35000 Kgs Per Month

Product Description

OhmAlloy-4J33  (Expansion alloy)

(Common Name: 33НК, 4J33, KV-4, Ni33Co17)

4J33 alloy has a close Linear expansion coefficient with 95% Al2O3 ceramic in the range of -60 to 600 degrees Celsius. it is an Important sealing structural material in the electric vacuum industry; Mainly used for matching and ceramic sealing. 

 

Normal composition%

Ni	32.0~33.6	Fe	Bal.	Co	14.0~15.2	Si	≤0.3
Mo	-	Cu	-	Cr	-	Mn	≤0.5
C	≤0.05	P	≤0.02	S	≤0.02

 

Typical Physical properties

Density (g/cm3)	8.27
Electrical resistivity at 20ºC(Om*mm^2/m)	0.46
Thermal conductivity, λ/ W/(m*ºC)	17.6
Curie point   Tc/ ºC	440
Elastic Modulus,  E/ Gpa	139

Coefficient of expansion

θ/ºC	α1/10^-6ºC^-1	θ/ºC	α1/10^-6ºC^-1
20~300	6.3	20~400	6.1
20~500	6.9	20~600	8.3

Typical Mechanical properties

Tensile Strength	Elongation
Mpa	%
539	32

 

The heat treatment process
Stress relief annealing	Heating to 470~540ºC. Keep 1~2h, cooling in the air
Annealing	Heating to 750~ 900ºC In the medium vacuum
Holding time, h	15min. ~ 1 hour
cooling	In the air

Style of supply

Alloys Name	Type	Dimension
OhmAlloy-4J33	Wire	D= 0.1~8 mm
OhmAlloy-4J33	Strip	W= 5~250 mm	T= 0.1 mm
OhmAlloy-4J33	Foil	W= 10~100 mm	T= 0.01~0.1 mm
OhmAlloy-4J33	Bar	Dia= 8~100 mm	L= 50~1000 mm

FAQ

1. What's the minimum quantity customer can order?
If we have your size in stock, we can provide any quantity you want.
If we do not have, for spool wire, we can produce 1 spool, about 2-3kg. For coil wire, 25kg.
2. How can you pay for small sample amount?
We have Western union account, wire transfer for sample amount also ok.

3. 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.

4. 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.

5. 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.

6. 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.