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Note:
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.
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4J29HK sheet