248-305-7700sales@custom-electric.com

High Temperature Bulk Wire

high-temp-bulk-wireLarge And Small Quantities Of Electric Resistance Wire. Custom Electric maintains a large inventory of electric resistance materials, including conventional alloys, high temperature alloys, and specialty materials. In most instances, large and small orders for wire, ribbon, rod, and strip can be filled within 48 hours.

Changing Alloy Technology. For years, 80% nickel, 20% chrome alloys were used to fabricate electric heating elements. This material provides excellent mechanical properties in the hot state, BTU is limited to temperatures of 2190º F (1200º C).

Today, iron/chrome/aluminum alloys are replacing nickel/chrome in many applications. The most significant benefit of the iron/chrome/aluminum alloy is higher operating temperatures, up to 2150° F (1150° C). This translates to higher surface loading and increased productivity.

Other benefits of iron/chrome/aluminum materials are from two to four times longer service life and no spalling oxides to contaminate furnace loads.

Radiant And Protective Tubes. In addition to Kanthal APM and APMT extruded tubes, Custom Electric can provide cast tubes.

Note: New products always are being added to inventory. If you do not see what you need, contact Custom Electric.

KANTHAL and NIKROTHAL alloys are generally available in wire or strip form.

APM A-1 AF D NIKROTHAL
80
NIKROTHAL
70
NIKROTHAL
60
NIKROTHAL
40
Max continuous operating temp.,
°C 1425 1400 1300 1300 1200 1250 1150 1100
°F 2600 2550 2370 2370 2190 2280 2100 2010
Nominal composition,
%Cr 22 22 22 22 20 30 15 20
%Al 5.8 5.8 5.3 4.8
%Fe Rest Rest Rest Rest
%Ni 80 70 60 35
Resistivity
at 20°C, Ωmm2mm1 1.45 1.45 1.39 1.35 1.09 1.18 1.11 1.04
at 65°F, Ω/cmf 872 872 836 812 655 704 668 626
Density,
g/cm3 7.10 7.10 7.15 7.25 8.3 8.1 8.2 7.9
lb/in3 0.256 0.256 0.259 0.262 0.300 0.296 0.296 0.285
Coefficient of thermal expansion,
K-1
20-750°C, 68-1380°F 14.10-6 14.10-6 14.10-6 14.10-6 17.10-7 16.10-6 16.10-6 18.10-6
20-1000°C, 68-1838°F 15.10-6 15.10-6 15.10-6 15.10-6 18.10-6 17.10-6 17.10-6 19.10-6
Thermal conductivity at 20°C
W m-1 K-1 13 13 13 13 15 13 13 13
68°F, BTU in. ft.-2h-1°F-1 90 90 90 90 104 90 90 90
Specific heat capacity
KJ kg-1K-1, 20°C 0.46 0.46 0.46 0.46 0.446 0.46 0.46 0.50
Btu lb-1 °F-1, 68°F 0.110 0.110 0.110 0.110 0.110 0.110 0.110 0.119
Melting point,
°C 1500 1500 1500 1500 1400 1380 1390 1390
°F 2730 2730 2730 2730 2550 2515 2535 2535
Mechanical properties (approx.)*
Tensile strength, N mm-2 680 680 680 380 750 875 750 750
psi 99000 99000 99000 99000 109000 127000 109000 109000
Yield point, N mm-2 445 445 445 445 450 450 450 450
psi 65000 65000 65000 65000 65000 65000 65000 65000
Hardness, Hv 230 230 230 230 180 185 180 180
Elongation at rupture, % 19 19 19 19 30 30 30 30
Tensile strength at 900°C, N mm-2 40 34 37 34 100 120 100 120
1650°F, psi 5800 5000 5400 5000 14500 17400 14500 17400
Creep strength at 800°C, N mm-2 14 6 8 6 15 15 15 20
1000°C, N mm-2 1.8 1 1.5 1 4 4 4 4
1470°F, psi 2000 870 1160 870 2160 2160 2160 2160
1830°F, psi 260 145 215 145 580 580 580 580
Magnetic properties** Magnetic Magnetic Magnetic Magnetic Non Non Slightly Non
Emissivity, fully oxidized condition 0.70 0.70 0.70 0.70 0.88 0.88 0.88 0.88

*The values given apply for sizes of 4 mm (0.16 in.) diameter for the KANTHAL alloys and of 1 mm (0.04 in.) for the NIKROTHAL alloys
**Curie point 600° C (1,100° F)

Maximum Permissible Temperatures in Various Atmospheres

KANTHAL
A-1 & APM
KANTHAL
AF
KANTHAL
D
NIKROTHAL
80 & 70
NIKROTHAL
60
NIKROTHAL
40
°C °F °C °F °C °F °C °F °C °F °C °F
Oxidizing:
Air, dry
Air, moist
1400*
1200
2550
2190
1300**
1200
2550
2190
1399
1200
2370
2190
1200**
*
1150
2190
2100
1150
1100
2100
2010
1100
1050
2010
1920
Neutral:
N2, Nitrogen**Ar, Argon
Exothermic:
10 CO, 15 H2
5 CO2, 70 N2
12001050
1400**
1150
2190
1920
2550
2100
1250
1150
1300*
1150
2280
2010
2550
2100
1150
1000
1300
1100
2100
1830
2370
2010
1250
1250
1100***
2280
22802010
1200
1200
1100
2190
2190
2010
1150
1150
1100
2100
2100
2010
Reducing:
Endothermic:
20 CO, 40 H2,
40 N2
H2, Hydrogen
Cracked
ammonia:
75 H2, 25 N2
1050
1400*
1200
1920
2550
2190
1050
1400*
1200
1920
2550
2190
1000
1300
1100
1830
2370
2010
1100***
1250
1250
20102280
2280
1100
1200
1200
20102190
2190
1100
1150
1150
2010
2100
2100
Vacuum:
10-3 torr
1150 2100 1200 2190 1100 2010 1000 1830 900 1650 900 1650

* Max 1,425° C (2,600° F) for APM
** The higher values apply for pre-oxidized material
*** Please note risk of “green rot” formation in carburizing atmospheres. Use KANTHAL AF or NIKROTHAL 70
**** 1.250° C (2,280° F) for NIKROTHAL 70