4j29 Kovar Alloy Tube For Sealing Material Expansion Alloy Feni29co Kovar 4j29 Tube

Kovar Tube is a special alloy tube using the brand Kovar. Kovar is a low thermal expansion alloy composed mainly of nickel (approximately 29%), cobalt (approximately 17%) and iron (approximately 53%). Kovar Tube is widely used in many fields due to its excellent thermal expansion properties, dimensional stability and processability.

Thermal expansion properties of Kovar Tube are one of its most notable features. It has a thermal expansion coefficient close to that of materials such as glass and ceramics, making it an ideal packaging and joining material. When the temperature changes, the stress and mismatch problems between the Kovar Tube and the glass or ceramic are greatly reduced, ensuring the stability and reliability of the package.

 

Alloy Type	Trade Name	UNS No.	Specifications	Forms Of Supply
				Rod	Strip	Wire	Sheet
Ni29Co17	Kovar	K94610	ASTM F15	√	√	√	√
FeNi36	Invar 36	K93603	ASTM 1684	√	√		√
FeNi32Co5	Super Invar 32-5	KI93500	ASTMF1684	√	√		√
FeNi27Co25	Ceramvar	F1466	ASTMF1466	√	√	√	√
FeNi42	Alloy 42	K94100	ASTM F30	√	√		√
FeNi46	Alloy 46	K94600	ASTM F30	√	√		√
FeNi48	Alloy 48	K94800	ASTMF30	√	√		√
FeNi50	Alloy 52	K95050	ASTM F30	√	√	√	√

 

Item	1J33	3J01	3J9	4J29	4J32	4J33	4J45	FeNi50	Invar36
C	≤0.05	≤0.05	0.22-0.26	≤0.03	≤0.05	≤0.03	≤0.05	≤0.05	≤0.1
Mn	≤0.05	≤1.00	1.80-2.20	≤0.5	0.2-0.6	≤0.5	≤0.8	≤0.8	≤0.5
Fe	Rest
P	≤0.020	≤0.020	≤0.03	≤0.02	≤0.02	≤0.02	≤0.02	≤0.02	≤0.006
S	≤0.020	≤0.020	≤0.020	≤0.02	≤0.02	≤0.02	≤0.02	≤0.02	≤0.04
Si	0.30-0.6	≤0.80	1.30-1.70	≤0.3	≤0.2	≤0.3	≤0.3	≤0.3	≤0.35
Ni	32.8-33.8	34.5-36.5	9.0-10.5	28.5-29.5	31.5-33	28.5-29.5	44.5-45.5	49.5-50.5	35-38
Al	1.0-2.0	1.00-1.80	--	--	--	--	≤0.1	≤0.1	--
Co	--	--	--	16.8-17.8	3.2-4.2	16.8-17.8	-	-	-
Ti	-	2.70-3.20	-	-	-	-	-	-	-
Cu	-	--	--	--	≤0.2	0.4-0.8	≤0.2	--	--
Cr	--	11.5-13.0	19.0-20.5	≤0.2	--	≤0.2	--	--	--
Mo	--	--	1.60-1.85	≤0.2	--	≤0.2	--	--	--

 

Shape Size(mm) Wire 0.5-7.5 Rod/Bar 8.0-200 Strip (0.5-2.5)*(5-180) Tube custom made Plate custom made