Introduction

Resistance alloys have high resistivity and used in many varied applications—from small household appliances to large industrial process heating systems and furnaces. In appliances or industrial process heating, the heating elements are usually either open helical coils of resistance wire mounted with ceramic bushings in a suitable metal frame, or enclosed metal-sheathed elements consisting of a smaller-diameter helical coil of resistance wire electrically insulated from the metal sheath by compacted refractory insulation.

NiWire has been manufacturing resistance alloys and heating alloys from its foundation. Our stength is making wires, strips, ribbon and foil, including NiCr alloys and Fe-Cr-Al alloys.

We can also make stranded nichrome wire in a range of sizes. Our resistance wires are stranded into 7, 19, 37 or other type. Construction can be based on "king" wire specified diameter with outer wires of a different diameter.

Main Grades

Grade Property
Nichrome 80 high resistivity, good oxidation resistance and very good form stability. It has good ductility after use and excellent weldability
Nichrome 60 high resistivity, good oxidation resistance and very good form stability
NiCr 7030 excellent material for resistance wire and strip
NiCr 3020 good ductility after long time usage, good mechanical property at high temperature and good weldability
CrAl 23-5 used in fast response elements for ceramic glass top hobs and quartz tube heaters.
CrAl 25-5 used in where excellent oxidation and life properties in combination with good form stability properties are required
CrAl 27-7 use at temperatures up to 1400°C Max., best to replace Kanthal series

 

Reference value

Grade Electrical Resistivity
(μΩm)
Thermal Coefficient of expansion
(×10-6/℃)
Melting Temperature
(℃)
Density
(g・cm3)
Max Operating Temperature
(℃)
Nichrome 80 1.09 18.0 1400 8.40 1200
Nichrome 60 1.11 17.0 1390 8.20 1100