Stranded resistance heating wire

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

Caption Successive layers have different lay directions and lay length.

Unilayer

Caption Successive layers have the same lay directions and lay length.

Undirectional concentric

Caption Successive 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
Flex Ø	in	0.091	0.148	0.165	0.264	0.366
CSA	mm2	3.18	8.40	10.78	21.65	38.48
CSA	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
Strands	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
Weight	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