Main
characteristics
of Fe-Cr-Al- high resistances and electric heating alloy
|
 |
1Cr13Al4
|
0Cr25Al5
|
0Cr21Al6
|
0Cr23Al5
|
0Cr21Al4
|
0Cr21Al6Nb
|
0Cr27Al7Mo2
|
|
Main
chem-
ical
Comp-
osit-
ion
|
Cr
|
12.0-15.0 |
23.0-26.0 |
19.0-22.0 |
22.5-24.5 |
18.0-21.0 |
21.0-23.0
|
26.5-27.8
|
|
Al
|
4.0-6.0
|
4.5-6.5
|
5.0-7.0
|
4.2-5.0
|
3.0-4.2
|
5.0-7.0
|
6.0-7.0
|
|
RE
|
oppor-
tune
amount
|
oppor-
tune
amount
|
oppor-
tune
amount
|
oppor-
tune
amount
|
oppor-
tune
amount
|
oppor-
tune
amount
|
oppor-
tune
amount
|
|
Fe
|
Rest
|
Rest
|
Rest
|
Rest
|
Rest
|
Rest
|
Rest
|
|
|
|
|
|
|
Nb0.5
|
Mo1.8-2.2
|
|
Max.continuous
service temp.of
element (¡æ)
|
950
|
1250
|
1250
|
1250
|
1100
|
1350
|
1400
|
|
Resistivity
¦Ì¦¸.m,20¡æ
|
1.25
|
1.42
|
1.42
|
1.35
|
1.23
|
1.45
|
1.53
|
|
Density
(g/cm3 )
|
7.4
|
7.10
|
7.16
|
7.25
|
7.35
|
7.10
|
7.10
|
|
Thermal
conductivity
KJ/m.h.¡æ
|
52.7
|
46.1
|
63.2
|
60.2
|
46.9
|
46.1
|
45.2
|
|
Coefficient of
lines expansion
¦Á¡Á10-6/¡æ
|
15.4
|
16.0
|
14.7
|
15.0
|
13.5
|
16.0
|
16.0
|
|
Melting point¡æ
|
1450
|
1500
|
1500
|
1500
|
1500
|
1510
|
1520
|
|
Tensile strength
Mpa
|
580-680
|
630-780
|
630-780
|
630-780
|
600-700
|
650-800
|
680-830
|
|
Elongation at
rupture %
|
>16
|
>12
|
>12
|
>12
|
>12
|
>12
|
>10
|
|
Variation of
area %
|
65-75
|
60-75
|
65-75
|
65-75
|
65-75
|
65-75
|
65-75
|
|
Repeat bending
frequency(F/R)
|
>5
|
>5
|
>5
|
>5
|
>5
|
>5
|
>5
|
|
Hardness(H.B.)
|
200-260
|
200-260
|
200-260
|
200-260
|
200-260
|
200-260
|
200-260
|
|
Micrographic
structure
|
Ferrite
|
Ferrite
|
Ferrite
|
Ferrite
|
Ferrite
|
Ferrite
|
Ferrite
|
|
Magnetic
properties
|
Magnetic
|
Magnetic
|
Magnetic
|
Magnetic
|
Magnetic
|
Magnetic |
Magnetic |
|
|
|
 |
|
|
