Cr20Ni80 nichrome wire

Features:: Cr20Ni80, with its combination of oxidation resistance, stable electrical properties, mechanical performance, and cost-effectiveness, has become one of the most reliable electric heating alloy materials, making it a go-to choice for most medium- to high-temperature heating applications. Compared to regular nickel-chromium alloys, Cr20Ni80 shows noticeably better oxidation resistance. Tests show that after continuous oxidation at 800°C for 100 hours, the surface oxide layer is only 20 microns thick, whereas the standard alloy reaches 50 microns. Its resistance changes linearly with temperature, with errors within ±2%. The tensile strength at room temperature is 500-700 MPa. Even at high temperatures (800°C–1100°C), its tensile strength still stays around 250-350 MPa. Cr20Ni80 doesn’t become brittle after long-term high-temperature exposure, which extends its service life. Room temperature elongation is between 20%-30%, and it has excellent cold stamping and welding performance. After solution treatment, the alloy is single-phase austenite, keeping its structure stable during use. Even with new materials constantly emerging, Cr20Ni80 still holds a core spot in many medium- to high-temperature conventional heating scenarios thanks to its great value and reliability.; Cr20Ni80 Resistance Wire is also known as Nichrome V, Tophet A, Alloy A, Brightray C, Cronix 80, Nikrothal 80, Chromalloy, Chromel A, and Gilphy 80, N8, HAI-NiCr 80, Resistohm 80, Protoloy, MWS-650, Stablohm 650
Specifications:: Bright and soft annealed finish: 0.025 - 1.6mm; Acid-pickled finish or primary color (dark green): 1.0 -12.0mm; Rods: 6.0-150.0mm
Flat wires: width 0.2 - 6.0mm and thickness 0.08 - 1.0mm; Strips: width 5.0 - 300mm and thickness 0.05 - 4.0mm

Product Description

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Chemical Composition:

C	P	S	Mn	Si	Cr	Ni	Al	Fe
≤				Si	Cr	Ni	Al	Fe
0.08	0.02	0.015	0.6	0.75~1.6	20.0~23.0	Remainder	≤0.5	≤1.0

Physical Properties:

Max. Operating Temp.	1200ºC	Resistivity at 20ºC (μΩ·m)	<0.50mm 1.09±0.05 0.5-3.0mm 1.13±0.05 >3.0mm 1.14±0.05
Density	8.40 g/cm³	Thermal conductivity(20ºC)	15 W/(m·K)
Average linear expansion coefficient(20-1000ºC)	18.0×10^-6/K	Specific heat capacity	0.46 J/(g·K)
Approx. melting point	1400ºC	Elongation after Fracture (A/%)	Diameter≤3.0mm: ≥20% Diameter>3.0mm: ≥25%
Tensile strength(R_m/MPa)	≥650	Accelerated life test	≥80h/1200ºC
Micrographic structure	Austenite	Magnetic properties	Nonmagnetic

Technical parameters:

Diameter (mm)	Ohm per meter (20ºC Ω/m)	Length per kg (m/kg)	Weight per meter (g/m)	Diameter (mm)	Ohm per meter (20ºC Ω/m)	Length per kg (m/kg)	Weight per meter (g/m)
0.05	555.133	60630.51	0.01649	1.1	1.1891	125.27	7.98278
0.06	385.509	42104.52	0.02375	1.2	0.9991	105.26	9.50017
0.07	283.231	30933.93	0.03233	1.3	0.8513	89.69	11.14950
0.08	216.849	23683.79	0.04222	1.4	0.7341	77.33	12.93078
0.09	171.337	18713.12	0.05344	1.5	0.6394	67.37	14.84401
0.1	138.783	15157.63	0.06597	1.6	0.5620	59.21	16.88919
0.11	114.697	12526.96	0.07983	1.7	0.4978	52.45	19.06631
0.12	96.377	10526.13	0.09500	1.8	0.4441	46.78	21.37538
0.13	82.120	8969.01	0.11150	1.9	0.3985	41.99	23.81639
0.15	61.681	6736.72	0.14844	2.0	0.3597	37.89	26.38936
0.17	48.022	5244.85	0.19066	2.2	0.2973	31.32	31.93112
0.19	38.444	4198.79	0.23816	2.4	0.2498	26.32	38.00067
0.21	31.470	3437.10	0.29094	2.6	0.2128	22.42	44.59801
0.25	22.205	2425.22	0.41233	2.8	0.1835	19.33	51.72314
0.27	19.037	2079.24	0.48095	3.0	0.1599	16.84	59.37605
0.29	16.502	1802.33	0.55484	3.2	0.1417	14.80	67.55675
0.31	14.442	1577.28	0.63400	3.4	0.1256	13.11	76.26524
0.35	11.329	1237.36	0.80817	3.6	0.1120	11.70	85.50151
0.40	8.674	947.35	1.05557	3.8	0.1005	10.50	95.26558
0.45	6.853	748.52	1.33596	4.0	0.0907	9.47	105.55742
0.50	5.551	606.31	1.64933	4.5	0.0717	7.49	133.59611
0.55	4.756	501.08	1.99570	5.0	0.0581	6.06	164.93348
0.60	3.997	421.05	2.37504	5.5	0.0480	5.01	199.56950
0.65	3.405	358.76	2.78738	6.0	0.0403	4.21	237.50420
0.70	2.936	309.34	3.23270	6.5	0.0344	3.59	278.73757
0.80	2.248	236.84	4.22230	7.0	0.0296	3.09	323.26961
0.85	1.991	209.79	4.76658	7.5	0.0258	2.69	371.10032
0.90	1.776	187.13	5.34384	8.0	0.0227	2.37	422.22970
0.95	1.594	167.95	5.95410	8.5	0.0201	2.10	476.65774
1.00	1.439	151.58	6.59734	9.0	0.0179	1.87	534.38446

The above parameters are based on Chinese National Standard GB/T1234-2012. The tolerance of resistance per meter: 0.03-0.06mm is ±10%; 0.07-0.12mm is ±8%; 0.13-0.17mm is ±7%; 0.18-0.32mm is ±6%; A wire diameter above 0.32mm is ±5%. We provide nickel-chromium alloy products in various shapes, such as wires, ribbons, and rods. Other alloys like Cr30Ni70, Cr15Ni60 and Cr20Ni35/Cr20Ni30 are also available upon request.

Cr20Ni80 Datasheet DOWNLOAD