Categories: Heating materials , Resistance materials

Recognizing the need for more precisely controlled stranded wire within the heat treatment industry and working closely with our cable customers, Kanthal has developed a range of stranded resistance wires in the well known Nikrothal®, Kanthal® and nickel alloys.

Content:
Strand diameter
Standard stock material
Flexible terminals for industrial applications

These alloys possess the optimum properties for high performance at elevated temperatures and in other adverse conditions where reliability and quality is of paramount consideration.

Alloy Nominal composition, %
Ni Cr Fe Al Mn
Nikrothal® 80 80 20 
Nikrothal® 60 60 16 balance
Kanthal® D 22 balance 4.8
Kanthal® AF 22 balance 5.3
Nickel 99.2 
NiMn 98 2
Alloy Resistivity at 20°C (68°F) Max. temp*
Ω mm2/m Ω/cmf °C °F
Nikrothal® 80 1.09 655 1200 2190
Nikrothal® 60 1.11 668 1150 2100
Kanthal® D 1.35 812 1300 2370
Kanthal® AF 1.39 836 1300 2370
Nickel 0.09 54
NiMn 0.11 66

* Values given apply for sizes approx. 1.0 mm (0.039 in)

STRAND DIAMETER

Nominal diameter to be determined from single-end wire diameters, which have to meet resistance requirements. Resistance generally takes priority over diameter. The calculation is:

Strand normal diameter = single-end diameter×F

F = 3 for 7-strand

F = 5 for 19-strand true concentric

F = 7 for 37-strand true concentric

Size range

Up to 37 wires (ends) of diameter between

0.20–0.85 mm (0.008–0.033 in).

Other stranded wire dimensions and configurations can be supplied on request.

True concentric

CaptionSuccessive layers have different lay directions and lay length.

Unilayer

CaptionSuccessive layers have the same lay directions and lay length.

Undirectional concentric

CaptionSuccessive layers have the same lay directions and increasing lay length.

Standard stock material

Alloy Total diam. nominal No. of strands × size King wire size Resistance Length Weight
mm in mm in mm in Ω/m Ω/ft m/kg ft/lb g/m lb/ft
Nikrothal® 80 2.76 0.109 37 × 0.385 37 × 0.0152 0.450 0.0177 0.2794 0.0852 28 41.67 36 0.0242
Nikrothal® 80 2.67 0.105 19 × 0.523 19 × 0.0206 0.574 0.0226 0.2850 0.0869 29 43.16 34 0.0228
Nikrothal® 80 2.67 0.105 19 × 0.544 19 × 0.0214 0.574 0.0226 0.2648 0.0807 27 40.18 37 0.0249
Nikrothal® 80 2.87 0.113 19 × 0.574 19 × 0.0226 0.574 0.0226 0.2394 0.0730  25 37.20 41 0.0276
Nikrothal® 60 2.76 0.109 19 × 0.523 19 × 0.0206 0.574 0.0226 0.2902 0.0885 30 44.64 34 0.0228
Nickel 2.87 0.113 19 × 0.574 19 × 0.0226 0.574 0.0226 0.0198 0.0060 21 31.25 47 0.0320
NiMn2 2.87 0.113 19 × 0.574 19 × 0.0226 0.710 0.0280 0.0234 0.0071 22 32.74 45 0.0305
NiMn2 2.87 0.113 18 × 0.610 18 × 0.0240 – 0.0280 0.0210 0.0064 19 28.28 53 0.0354

Flexible terminals for industrial applications

Flex size
X Small Small Medium Large X Large
Flex Ø mm 2.3 3.75 4.2 6.7 9.3
in 0.091 0.148 0.165 0.264 0.366
CSA mm2 3.18 8.40 10.78 21.65 38.48
in2 0.005 0.013 0.017 0.034 0.060
Strands mm 7 × 0.76 19 × 0.75 19 × 0.85 49 × 0.75 49 × 1.00
in 0.27 × 0.0299 0.75 × 0.0295 0.75 × 0.0335 1.93 × 0.0295 1.93 × 0.0394
Weight g/m 26.24 70 86 184 325
lb/ft 0.018 0.047 0.058 0.124 0.218
Current, A low temp. <400°C (<750°F) 7 15 22 44 77
Current, A high temp. >400°C (>750°F) 5 15 20 30 45
Cold resistivity Rc Ω/m 0.347 0.106 0.102 0.050 0.028

CSA = Cross sectional area

Other stranded wire dimensions and configurations can be supplied on request.