Eleatric Heating alloy

Iron-chromium-aluminium (FeCrAl) alloys

Iron-chromium-aluminium (FeCrAl) alloyshave approximately the same basis composition: 12 to 28 % of chromium, 4.0 to 7 % of aluminum, balance being iron.Some of alloys contain rare molybdenum, niobium,silicium and so on. The alloy has the characteristics of high resistivity,low temperature coefficient and high temperature resistance. Also it has a good corrosion resistance at high temperature, and the price is much cheaper than Nickel chrome wire.So they are an ideal heating material used in industrial furnaces, household appliances and far-infrared devices.

Chemical Composition and Main Property of Fe-Cr-Al Resistance Alloy

Properties \Grade

1Cr13Al4

0Cr25Al5

0Cr21Al6

0Cr23Al5

0Cr21Al4

0Cr21Al6Nb

0Cr27Al7Mo2

 Main Chemical Composition
(%)

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

-

-

-

-

-

-

-

Fe

Rest

Rest

Rest

Rest

Rest

Rest

Rest

　

　

　

　

　

　

Nb0.5

Mo1.8-2.2

       Max Work Temp(℃)

950

1250

1250

1250

1100

1350

1400

  Resisivity 20℃(Ωmm2/m)

1.25±0.08

1.42±0.06

1.42±0.07

1.35±0.07

1.23±0.07

1.45±0.07

1.53±0.07

Density(g/cm3)

7.4

7.1

7.16

7.25

7.35

7.1

7.1

 Coefficient of Thermal Expansion(α×10-6/℃)

15.4

16

14.7

15

13.5

16

16

   Melting Point(℃)

1450

1500

1500

1500

1500

1510

1520

Tensile Strength (N/mm2)

580-680

630-780

630-780

630-780

600-700

650-800

680-830

Elongation(%)

>16

>12

>12

>12

>12

>12

>10

Section Variation Shrink Rate(%)

65-75

60-75

65-75

65-75

65-75

65-75

65-75

RepeatedlyBendFrequency(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 Property

Magnetic

Magnetic

Magnetic

Magnetic

Magnetic

Magnetic

 Magnetic

A series of Ni-Cr,Ni-Cr-Fe alloys with their diameters and characteristics (Conversion Table)

Dia
mm

Cross sectional area
Mm2

Weight per Meter（kg/m）

Resistance per meter at 20℃（Ω/m）

OCr13Al4

OCr25Al5
OCr21Al6
OCr21Al6Nb
OCr27Al7MO2

Cr15Ni60

Cr20Ni80

Cr20Ni30

OCr13Al4

OCr25Al5
OCr21Al6

OCr27Al7
MO2

OCr21Al6
Nb

Cr15Ni60

Cr20Ni80

Cr20Ni30
0.1 0.0079 0.00006 0.00006 0.00006 0.00007 0.00006 160.4 178.3 191 183.5 131.6 140.1 141.3
0.2 0.0314 0.00023 0.00022 0.00026 0.00026 0.00025 40.13 44.59 44.77 46.17 33.12 35.01 35.33
0.3 0.0707 0.00052 0.0005 0.00058 0.00059 0.00056 17.82 19.8 21.22 20.5 14.71 15.56 15.7
0.4 0.01257 0.00093 0.00089 0.00103 0.00106 0.00099 10.02 11.14 11.93 11.53 8.27 8.75 8.83
0.5 0.1964 0.0015 0.0014 0.00161 0.00165 0.0016 6.416 7.128 7.638 7.382 5.295 5.604 5.655
0.6 0.2827 0.0021 0.002 0.00232 0.00237 0.0022 4.457 4.952 5.306 5.129 3.678 3.891 3.926
0.8 0.5027 0.0037 0.0036 0.00412 0.00422 0.0039 2.507 2.785 2.984 2.884 2.068 2.188 2.208
1 0.7854 0.0058 0.0056 0.0064 0.0066 0.0062 1.604 1.872 1.91 1.846 1.324 1.401 1.413
1.2 1.131 0.0084 0.008 0.0092 0.0095 0.0089 1.114 1.238 1.326 1.282 0.919 0.972 0.9814
1.4 1.539 0.011 0.011 0.0126 0.0129 0.0122 0.8187 0.9097 0.9747 0.9421 0.6757 0.7147 0.7212
1.6 2.011 0.015 0.014 0.0164 0.0169 0.0159 0.6266 0.6962 0.7459 0.721 0.5171 0.547 0.522
1.8 2.545 0.019 0.018 0.0209 0.0214 0.0201 0.4951 0.5501 0.5894 0.5697 0.4086 0.4322 0.4361
2 3.142 0.023 0.22 0.0257 0.0264 0.0248 0.401 0.4456 0.4775 0.4614 0.3309 0.3501 0.3533
2.2 3.801 0.028 0.027 0.0312 0.0319 0.03 0.3315 0.3683 0.3946 0.3814 0.2736 0.2894 0.292
2.4 4.524 0.033 0.032 0.037 0.038 0.036 0.2785 0.3095 0.3316 0.3205 0.2298 0.2431 0.2454
2.6 5.309 0.039 0.038 0.044 0.045 0.042 0.2373 0.2637 0.2825 0.2731 0.1958 0.2027 0.2091
2.8 6.158 0.046 0.044 0.05 0.052 0.049 0.2046 0.2273 0.2436 0.2354 0.1688 0.1786 0.1803
3 7.069 0.052 0.05 0.058 0.059 0.056 0.1782 0.198 0.2122 0.2051 0.1471 0.1556 0.157
3.2 8.043 0.06 0.057 0.066 0.068 0.064 0.1576 0.1741 0.1856 0.1802 0.1293 0.138 0.1386
3.5 9.621 0.071 0.068 0.079 0.081 0.076 0.131 0.1455 0.1559 0.1507 0.108 0.1143 0.1154
4 12.57 0.093 0.089 0.103 0.105 0.099 0.1002 0.1114 0.1193 0.1153 0.0827 0.0875 0.0883
4.5 15.9 0.118 0.113 0.13 0.134 0.126 0.0792 0.0881 0.0943 0.0911 0.0654 0.0691 0.0698
5 19.64 0.145 0.139 0.161 0.165 0.155 0.0642 0.0713 0.0764 0.0738 0.0529 0.056 0.0565
5.5 23.76 0.175 0.168 0.195 0.199 0.188 0.053 0.0589 0.0631 0.061 0.0437 0.0463 0.0467
6 28.27 0.209 0.201 0.232 0.237 0.223 0.0446 0.0495 0.0531 0.0512 0.0367 0.0389 0.0396
6.5 33.17 0.245 0.235 0.272 0.279 0.262 0.0376 0.0428 0.0461 0.0437 0.0313 0.034 0.0343
7 38.48 0.284 0.273 0.315 0.323 0.303 0.0327 0.0364 0.039 0.0376 0.027 0.0293 0.0296
8 50.24 0.371 0.36 0.36 0.422 0.397 0.0248 0.0282 0.0304 0.0288 0.0207 0.0224 0.0226

Temperature Factor of the Resistivity

Grade

20℃

100℃

200℃

300℃

400℃

500℃

600℃

700℃

800℃

900℃

1000℃

1100℃

1200℃

1Cr13A14

1

1.005

1.014

1.028

1.044

1.064

1.09

1.12

1.132

1.164

1.172

1.18

1.186

0Cr25A15

1

1.002

1.005

1.008

1.013

1.021

1.03

1.038

1.04

1.042

1.044

1.049

1.047

0Cr21A16

1

1

1.002

1.006

1.011

1.02        

1.037

1.043

1.046

1.049

1.052

1.055

1.058

0Cr21A16Nb

1

0.997

0.996

0.994

0.991

0.99

0.99

0.99

0.99

0.99

0.99

0.99

0.99

0Cr27A17Mo2

1

0.992

0.986

0.981

0.978

0.976

0.974

0.972

0.97

0.969

0.968

0.968

0.967

Cr20Ni80

1

1.006

1.012

1.018

1.025

1.026

1.018

1.01

1.008

1.01

1.014

1.021

1.025

Cr15Ni60

1

1.011

1.024

1.038

1.052

1.064

1.069

1.073

1.078

1.088

1.095

1.109

 

Cr20Ni30

1

1.023

1.052

1.079

1.103

1.125

1.141

1.158

1.713

1.187

1.201

1.214

1.226