TECHNICAL INFORMATION
Resistance Alloys (India) Ltd. Electric Resistance Heating Alloy RAIL®- HTM Wire RAIL®-HTM is an advanced, high purity, high temperature metallurgical product of ferritic ironchromium-aluminum alloy (Fe-Cr-Al alloy) with life enhancing additive Re. It can be used at wire temperature up to 1425°C RAIL®-HTM has several unique characteristics like higher resistivity, superior oxidation, high temperature use, lower density, higher yield and exceptional long life. RAIL®-HTM is specially recommended for use in powder metallurgy furnaces, diffusion furnaces, radiant tube heating furnaces and all kinds of furnaces that are required to be operated at high temperature in the range of 1250 °C - 1425 °C Chemical Composition Cr
Al
Si
Mn
C
Re
Fe
23.5%
6.0%
<0.4%
<0.7%
<0.04%
Traces
Bal
Min
22%
5.5%
Max
25%
6.5%
Nominal
Physical, Electrical & Mechanical Properties Density g/cm3
…
7.10
Electrical Resistivity at 20 °C mm2/m
…
1.45 0.03
Elongation %
…
Tensile Strength Kgs/mm2
…
Magnetic Property
…
+ 0.07 ≥16 65-80 Magnetic
Max Continuous Operating Temperature (in air)
…
1425 °C
Melting Temperature
…
1500 °C
Table for HTM Wire DIA. SWG
5
6 7 78 9 10 11 12
13 14 15 16 17 18 19
mm 8.00 7.50 7.00 6.50 6.00 5.50 5.00 4.50 4.00 3.50 3.00 5.38 4.88 4.47 4.06 3.66 3.25 2.95 2.64 2.34 2.03 1.83 1.63 1.42 1.22 1.02
Resistance Ω/ m 0.029 0.033 0.038 0.044
0.051 0.061 0.074 0.091 0.115 0.151 0.205 0.064 0.077 0.092 0.112 0.138 0.175 0.212 0.265 0.337 0.448 0.551 0.695 0.915 1.240 1.774
Length
Weight
Surface Area
m/kg 2.801 3.187 3.658 4.243 4.979 5.926 7.170 8.852 11.204 14.633 19.917
g/m 357.03 313.79 273.35 235.69 200.83 168.75 139.46 112.97 89.26 68.34 50.21
cm 2 /m 251.43 235.71 220.00 204.29 188.57 172.86 157.14 141.43 125.71 110.00 94.29
cm 2 / Ω 8719.49 7184.64 5841.38 4676.94 3678.54 2833.41 2128.78 1551.88 1089.94 730.17 459.82
6.193 7.527 8.971 10.875 13.382 16.971 20.598 25.720 32.737 43.500 53.527 67.469 88.900 120.436 172.297
161.47 132.85 111.46 91.95 74.73 58.92 48.55 38.88 30.55 22.99 18.68 14.82 11.25 8.30 5.80
169.09 153.37 140.49 127.60 115.03 102.14 92.71 82.97 73.54 63.80 57.51 51.23 44.63 38.34 32.06
2651.97 1979.16 1521.05 1139.72 834.96 584.62 437.21 313.35 218.21 142.47 104.37 73.75 48.76 30.92 18.07