RAIL®-HTM is a high-purity iron-chromium-aluminum alloy wire developed by Resistance Alloys (India) Ltd. that can withstand temperatures up to 1425°C. It has properties like high resistivity, superior oxidation resistance, and long life that make it suitable for use in high-temperature furnaces. The document provides detailed information on the alloy's chemical composition, physical properties, electrical resistivity at different diameters, and maximum operating temperature. It is intended for use in applications requiring wire heating at temperatures between 1250-1425°C, such as powder metallurgy furnaces.

1. 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

2. 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
Resistance
Ω/ m
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
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
RAIL® is Regd. Trade Mark of Resistance Alloys (India) Ltd.
This information is meant for user's guidance only. It is being published to the best of our knowledge and is
subject to change as additional knowledge and experience is gained. It should not be construed as a warranty or
representation implying any legal responsibility on us.
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