These alloys are suitable
for usage of hi-temperature, which have good tensile strength and are rarely
softened even under hi-temperature. Still they are not brittle, they are endurable
to gas, corrosion and oxidation. There is high dense and coherent oxidation
film covering its surface, the film can endure tremendous temperature change,
will never be peeled off.
Besides, comparing
with resistance wire made from other material, because of the lighter weight,
and larger in resistivity resistors adopting this wire will be very light
in weight.
|
Type |
Chemical Composition (%) |
||||||
|
Ni |
Cr |
Al |
C |
Si |
Mn |
Fe |
|
|
Cr20Ni80 |
above 77 |
19~21 |
|
below 0.15 |
0.75~1.5 |
below 2.5 |
below 1 |
|
Cr15Ni60 |
above 57 |
15~18 |
|
below 0.15 |
0.75~1.5 |
below 1.5 |
rest |
|
0Cr25Al5 |
|
23~26 |
4~6 |
below 0.10 |
below 1.5 |
below 1.0 |
rest |
|
0Cr19Al3 |
|
17~21 |
2~4 |
below 0.10 |
below 1.5 |
below 1.0 |
rest |
|
Type |
Resistivity (mΩ·m) 23℃ |
Max work temperature ℃ |
Specific
gravity 7.15g/cm3 |
Specific heat cal/g℃ |
Melting point ℃ |
Tensile strength kg/mm2 |
Elongation % |
|
Cr20Ni80 |
1.08±0.05 |
1150 |
8.41 |
0.106 |
1400 |
65~80 |
25~35 |
|
Cr15Ni60 |
1.12±0.05 |
1000 |
8.25 |
0.112 |
1390 |
65~80 |
25~35 |
|
0Cr25Al5 |
1.42±0.06 |
1250 |
7.20 |
0.201 |
1510 |
65~85 |
7~18 |
|
0Cr19Al3 |
1.23±0.06 |
1100 |
7.35 |
0.199 |
1500 |
65~85 |
10~20 |
|
Type |
Test Methods |
Times |
|
Cr20Ni80 |
Method I 1200℃ |
above 500 |
|
Cr15Ni60 |
Method I 1200℃ |
above 300 |
|
0Cr25Al5 |
Method U 1300℃ |
above 250 |
|
0Cr19Al3 |
Method U 1300℃ |
above 100 |
|
Wire Dia |
Sectional area mm2 |
Resistance Ω/m |
Lengthm/kg |
Current(Ampere)Value
when a single wire is horizontally hookedup in open air |
|||||||
|
B.S |
mm |
200℃ |
300℃ |
400℃ |
500℃ |
600℃ |
700℃ |
800℃ |
|||
|
0 1 2 3 4 |
8.0 7.0 6.5 6.0 5.5 |
50.27 38.48 33.18 28.27 23.76 |
0.0215 0.0281 0.0326 0.0382 0.0455 |
2.34 3.06 3.54 4.16 4.95 |
123.3 100.0 90.8 80.5 71.0 |
167.2 137.0 123.6 109.5 96.8 |
204.5 167.2 150.8 133.0 117.2 |
243.0 198.3 178.7 158.0 138.6 |
277.0 226.8 203.5 179.0 158.0 |
309.0 251.5 227.2 200.0 176.4 |
345.2 281.3 354.0 223.5 197.0 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
4 5 6 7 8 |
5.0 4.5 4.0 3.5 3.2 |
19.64 | |||||||||