Features and Application Notes
ISA
®
-CHROM 30 is especially characterized by high resistivity and
relatively low prices when compared with other nickel-chromium
alloys. In spite of its relatively high iron content, thisalloy is resistant
to oxidation and chemical corrosion. ISA
®
-CHROM 30 is non-magnetic.
It is suitable for high-value electrical resistors and for heating wires
for any application, also for heating cords and cables. The maximum
working temperature in air is +600 °C when used for resistance
wires and +1,050 °C when used for heating wires.
Form of Delivery
ISA
®
-CHROM 30 is supplied in the form of round wires in the range
0.05 to 1.00 mm Ø usually in bare condition. On special request
insulated wires and stranded wires can also be manufactured.
Notes on Treatment
ISA
®
-CHROM 30 can easily be spot-welded.
Under certain conditions brazing and soldering is possible.
1) ISA
®
-CHROM 30 is a registered trademark of Isabellenhütte Heusler GmbH & Co. KG.
2) This value applies to wires of 2.0 mm. For thinner wires the minimum values will substantially increase, depending on the dimension.
Physical Characteristics (Reference Values)
Density at +20 °C
Melting point
Specic heat
at +20 °C
Thermal conducti-
vity at +20 °C
Average linear thermal expansion coefcient
between +20 °C and
Thermal EMF
against copper at
+100 °C +400 °C +20 °C
g/cm³ lb/cub in °C J/g K W/m K 10
-6
/K 10
-6
/K µV/K
7.90 0.29 +1,390 0.50 13.00 14.50 16.00 -3.00
1/2 Data sheets // ISA
®
-CHROM 30
Brand
Name
ISA
®
-CHROM
30
1)
Material
Code
1.4860
Abbreviation
NiCr3020
Chemical Composition (mass components) in %.
Average values of alloy components
Fe
Rem.
Ni
30
Cr
20
Electrical Resistance in Annealed Condition
Temperature coefcient of electrical
resistance between
Electrical resistivity in: µΩ x cm (rst line) and Ω /CMF (second line)
Reference Values
+20 °C and +105 °C
10
-6
/K
+20 °C
tolerance ±10 %
+100 °C +200 °C +300 °C +400 °C +500 °C
+300 to +400 104 107 111 114 117 120
626 644 668 686 704 722
Mechanical Properties at +20 °C in Annealed Condition
Tensile Strength
2)
Elongation (L
0
= 100 mm) % at nominal diameter in mm
MPa psi 0.020 to 0.063 > 0.063 to 0.125 > 0.125 to 0.50 > 0.50 to 1.00 > 1.00
600 87,000 ≈ 8 ≈ 14 ≈ 18 ≥ 18 ≥ 25
The specications of the electrical and physical properties generally reference the following standards:
DIN 17 471 Resistance Alloys – Properties
ASTM B267 Standard specication for wires for the production of wirewound resistors
DIN 17 470 Heating conductor alloys – Technical delivery conditions for round and at wires
ASTM B344 Standard specication for drawn/rolled nickel-chromium and nickel-chromium-iron wires for electric heating elements
Properties and requirements depend on the material condition (formed, annealed ...) as well as the design (bare, insulated ... ) and may deviate from the
specied values.
2/2 Data sheets // ISA
®-
CHROM 30
Nominal Diameter
mm
Cross Section
mm²
Weight
per 1.000 m
g
DC Resistance Referred to Length at +20 °C
Ω/m
Nominal Value
Tolerance Minimum Value Maximum Value
0.050 0.001963 15.50 530
±8 %
487 572
0.056 0.002463 19.50 422 389 456
0.060 0.002827 22.30 368 338 397
0.063 0.003117 24.60 334 307 360
0.070 0.003848 30.40 270 249 292
0.071 0.003959 31.30 263 242 284
0.080 0.005027 39.70 207 190 224
0.090 0.006362 50.30 164 150 177
0.100 0.007854 62.00 132 122 143
0.110 0.009503 75.10 109
±5 %
104 115
0.112 0.009852 77.80 106 100 111
0.120 0.01131 89.30 92.0 87.4 96.6
0.125 0.01227 96.90 84.7 80.5 89.0
0.130 0.01327 105.00 78.4 74.4 82.3
0.140 0.01539 122.00 67.6 64.2 70.9
0.150 0.01767 140.00 58.9 55.9 61.8
0.160 0.02011 159.00 51.7 49.1 54.3
0.180 0.02545 201.00 40.9 38.8 42.9
0.200 0.03142 248.00 33.1 31.4 34.8
0.220 0.03801 300.00 27.4 26.0 28.7
0.224 0.03941 311.00 26.4 25.1 27.7
0.250 0.04909 388.00 21.2 20.1 22.2
0.280 0.06158 486.00 16.9 16.1 17.7
0.300 0.07069 558.00 14.7 14.0 15.4
0.315 0.07793 616.00 13.3 12.7 14.0
0.350 0.09621 760.00 10.8 10.3 11.4
0.355 0.09898 782.00 10.5 9.98 11.0
0.400 0.1257 993.00 8.28 7.86 8.69
0.450 0.1590 1,260.00 6.54 6.21 6.87
0.500 0.1963 1,550.00 5.30 5.03 5.56
0.550 0.2376 1,880.00 4.38 4.16 4.60
0.560 0.2463 1,950.00 4.22 4.01 4.43
0.600 0.2827 2,230.00 3.68 3.49 3.86
0.630 0.3117 2,460.00 3.34 3.17 3.50
0.650 0.3318 2,620.00 3.13 2.98 3.29
0.700 0.3848 3,040.00 2.70 2.57 2.84
0.710 0.3959 3,130.00 2.63 2.50 2.76
0.800 0.5027 3,970.00 2.07 1.97 2.17
0.900 0.6362 5,030.00 1.63 1.55 1.72
1.000 0.7854 6,210.00 1.32 1.26 1.39
Isabellenhütte Heusler GmbH & Co. KG // sales.alloys@isabellenhuette.de // Issue 04-Oktober-2022