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Home Products Low Expansion Alloys

4J50 Low Thermal Expansion Metals And Alloy Sealant Alloy For Electric Vacuum Industry

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FeCrAl Alloy (161)

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I search for Nichrome plate long time, and successfully bought it from Ohmalloy material. OHMALLOY provide real good service in alloy service and can always help me in finding the correct resistance alloy.

—— Mike Harness

OHMALLOY can provie me only 1kg Kovar alloy wire 1.0mm with short time, that is really amazing. Thanks

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Really professional in thermocouple wire and cable, what i want just can get from OHMALLOY

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Enamelled Constantan 0.08mm, i never expect to get only 2kg of it. But OHMALLOY supply it to me with good quality. God Jesus! Such a reliable supplier from china

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4J50 Low Thermal Expansion Metals And Alloy Sealant Alloy For Electric Vacuum Industry

Large Image : 4J50 Low Thermal Expansion Metals And Alloy Sealant Alloy For Electric Vacuum Industry Get Best Price

Product Details:

Place of Origin:	China(Shanghai)
Brand Name:	OHMALLOY
Certification:	ISO，SGS
Model Number:	4J50

Payment & Shipping Terms:

Minimum Order Quantity:	20kg
Price:	negotiable
Packaging Details:	In Wooden Box
Delivery Time:	7-20 Days after your deposit recieved
Supply Ability:	5000kg/month

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Detailed Product Description

Highlight:

invar alloy

kovar alloy

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 20℃(Ωmm²/m)	0.46
Thermal conductivity, λ/ W/(m*℃)	17.6
Curie point T_c/ ℃	440
Elastic Modulus, E/ Gpa	139

Coefficient of expansion

θ/℃	α₁/10^-6℃^-1	θ/℃	α₁/10^-6℃^-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 470~540℃. Keep 1~2h, cooling in the air
Annealing	Heating to 750~ 900℃ In the medium vacuum
Holding time, h	15min. ~ 1 hour
cooling	In the air

Style of suppDly

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