Specifications

1.Specilizing in kovar material
2. Have ISO9001:2008 certificate
3. Supply RoHs,Test Report
4. Professional manufacturers

 

4J29HK bar

 

Detailed Selling Lead Description

Characteristics:

1.Kovar has a wide usage in the electronics industry, such as metal parts bonded to hard glass envelopes. These parts are used for such devices as power tubes and X-ray tubes, etc.

2.In the semiconductor industry kovar is used in hermetically sealed packages for both integrated and discrete circuit devices.

3.Kovar is provided in a variety of forms to facilitate efficient manufacturing of various metal parts. It has thermal expansion characteristics matching those of hard glass. Used for matched expansion joints between metals and glass or ceramics.

 

1.Alloy grades and chemical composition consistent with the provisions of table 1

the chemical composition of Kovar(%)
C	P	S	Mn	Si	Cu	Cr	Mo	Ni	Co	Fe
Not more than≤
0.03	0.020	0.020	0.5	0.30	0.20	0.20	0.20	28.5-29.5	16.8-17.8	balance

 

2.The tensile strength of wire in line with the provisions of Table 2

Status code	State	Tensile strength,N/mm2
R 1/4I 1/2I 3/4I I	Soft state 1/4 Hard state 1/2 Hard state 3/4 Hard state Hard state	<585 585-725 655-795 725-860 >860

 

3.Strip tensile strength in line with the provisions of Table 3

Status code	State	Tensile strength,N/mm2
R 1/4I 1/2I 3/4I I	Soft state 1/4 Hard state 1/2 Hard state 3/4 Hard state Hard state	<570 520-630 590-700 600-770 >700

 

4.Alloy average linear expansion coefficient in line with the Table 4                  

Alloy Grades	Specimen heat treatment system	The average linear expansion coefficient a,10-6/ oC
		20-300 oC	20-400 oC	20-450 oC
kovar	In hydrogen atmosphere heated to 900 ± 20 oC, insulation 1h, and then heated to 1100 ± 20 oC, insulation 15min, to not more than 5 oC / min rate of cooling to below 200 oC released	-----	4.6-5.2	5.1-5.5

 

 

 

 

 

 

 

 

 

 

5.Alloy typical expansion coefficient                                                 

Alloy Grades	The average linear expansion coefficient a,10-6/ oC
	20-200 oC	20-300  oC	20-400 oC	20-450 oC	20-500 oC	20-600 oC	20-700 oC	20-800 oC
kovar	5.9	5.3	5.1	5.3	6.2	7.8	9.2	10.2

                                                                               

 

 

 

Note: The values in the table are for reference only.

Specification: Plate, sheet, strip, rod, bar, wire, tube.

We are looing forward to cooperate with you!