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Nichrome Wire Calculator
Calculate wire size, length, voltage, and power required for your application.


 

 


 


Spool (Pkg = Sp)

 


Open Coil
(Pkg = OC)

 

 

René 41 Wire

(Bare Resistance Wire)

 

SUPER ALLOY -- ULTIMATE WIRE FOR HOT-WIRE CUTTING

Twice as strong as nichrome wire of the same gauge

retains strength at high temperatures

 

For hobby, home, work, school, lab, industry

We normally ship same day when order is received by 2:00 pm Pacific time.

Free shipping
on all wire USA orders on this page

 (contact for international shipping cost)

 

The Pkg column below indicates how the wire is wound
OC = Wound as an Open Coil
Sp = Wound on a Spool
See pictures in the left sidebar

 

27 gauge is the most commonly used for foam cutting

28.5 gauge for a narrower kerf

24 or 25 gauge for long lengths of foam cutting or where even more

strength is desired than for 27 gauge

 

Description Gauge Dia.
(in.)
Pkg Catalog
#
Qty
(ft)
Price Click on these buttons to order
 René 41
 
super alloy

 (5.48 ohms/ft)

 The ULTIMATE
 hot-wire
cutting wire

28.5 .012 Oc RN29005 5 5.25

RN29010 10 7.50

RN29015 15 9.50

RN29020 20 11.00

Sp RN29025 25 14.25

RN29035 35 17.25

RN29050 50 22.00

RN29075 75 29.00

RN29100 100 36.00

RN29150 150 50.25

RN29200 200 64.00

RN29250 250 76.25

RN29500 500 146.75

Description Gauge Dia.
(in.)
Pkg Catalog
#
Qty
(ft)
Price Click on these buttons to order
 René 41
 
super alloy

 (4.02 ohms/ft)

 The ULTIMATE
 hot-wire
cutting wire

27 .014 Oc RN27005 5 6.00

RN27010 10 8.50

RN27015 15 11.00

RN27020 20 13.50

Sp RN27025 25 16.75

RN27035 35 20.50

RN27050 50 26.75

RN27075 75 35.75

RN27100 100 45.00

RN27150 150 63.75

RN27200 200 81.75

RN27250 250 98.75

RN27500 500 189.75

Description Gauge Dia.
(in.)
Pkg Catalog
#
Qty
(ft)
Price Click on these buttons to order
 René 41
 
super alloy

 (2.43 ohms/ft)

 The ULTIMATE
 hot-wire
cutting wire

25 .018 Oc RN25005 5 7.00

RN25010 10 10.00

RN25015 15 12.50

RN25020 20 15.50

Sp RN25025 25 22.75

RN25035 35 29.00

RN25050 50 38.75

RN25075 75 53.50

RN25100 100 68.50

RN25150 150 98.50

RN25200 200 127.75

RN25250 250 155.00

RN25300 300 183.00

Description Gauge Dia.
(in.)
Pkg Catalog
#
Qty
(ft)
Price Click on these buttons to order
 René 41
 
super alloy

 (1.97 ohms/ft)

 The ULTIMATE
 hot-wire
cutting wire

24 .020 Oc RN24005 5 8.00 Temporarily out of stock, expected  approx. 10/23
RN24010 10 11.50 Temporarily out of stock, expected  approx. 10/23
RN24015 15 14.50 Temporarily out of stock, expected  approx. 10/23
RN24020 20 18.25 Temporarily out of stock, expected  approx. 10/23
Sp RN24025 25 26.25 Temporarily out of stock, expected  approx. 10/23
RN24035 35 33.75 Temporarily out of stock, expected  approx. 10/23
RN24050 50 45.75 Temporarily out of stock, expected  approx.
RN24075 75 63.50 Temporarily out of stock, expected  approx. 10/23
RN24100 100 81.50 Temporarily out of stock, expected  approx. 10/23
RN24150 150 118.50 Temporarily out of stock, expected  approx. 10/23
RN24200 200 153.50 Temporarily out of stock, expected  approx. 10/23
RN24250 250 186.25 Temporarily out of stock, expected  approx. 10/23




Pronunciation of René: reh-NAY. eh pronounced as the e in met, ay as in hay.  It is pronounced as the name René or Reneé.

Rene 41 (René 41) wire is the ultimate material for hot-wire foam cutting and other hot wire applications—there is nothing better.  It retains its high strength at much higher temperatures than normal foam cutting temperatures.  Its room temperature tensile strength is double that of nichrome wire and it stretches very little as it is heated.  People who have used Rene 41 have said it is “unbreakable;” not exactly true but very strong and many have used it for years without breaking it.  It is used in production lines cutting foam polystyrene (EPS), thermal laminate and other materials where it is in use continually and also on oscillating cutting frames. It has an excellent track record of durability and long life in these applications as well as others.

Because this wire retains its strength at very high temperatures, it can be run at higher temperatures for cutting and so cut faster.  Also because of its strength, it can be used in longer lengths without needing to increase the diameter which would be required with nichrome.  This means increased speed and smaller kerfs and so less waste.  The 27 gauge will work for almost any length but if even more strength is needed or for rougher handling you can use either the 25 or 24 gauge.  The 27 gauge is used commercially to cut 4 ft square by 12' long billets of foam and in NC foam cutting machines.  Some people prefer the higher speed and smaller kerf obtainable with the 28.5 gauge (0.012" dia) wire.

Rene 41 is one of the alloys in the group called superalloys or high-performance alloys and was developed by General Electric for use in the aerospace industry. It is commonly used in gas turbine engines where its high temperature strength, creep resistance, fatigue life, phase stability, and oxidation and corrosion resistance makes it an ideal material for the application.  Other examples of superalloys are Hastelloy, Inconel, Waspaloy, Haynes alloyes, Incoloy and others. These alloys are also used in power generation, space vehicles, nuclear reactors, bomb casings, chemical processing vessels and many other uses.

If you are using cutting wire longer than 3 or 4 feet, this wire is recommended, or if you just want a wire that is stronger and will last longer, then Rene' wire is recommended.

This wire is tempered unlike nichrome which usually is annealed.  This means that it is stiffer and springs back more than nichrome of the same diameter.

The resistance if René wire is about 10% higher than nichrome wire.  You can still use the nichrome wire calculator --using 28 gauge nichrome will give you close to the same electrical requirements as for 27 gauge René.

The Certificate of Conformity for this wire lists the following:

Diameter Tolerance: 0.0137 - 0.0143 inch
Tensile Strength: 1683 - 1727 N/mm(244.1 - 250.5 ksi)

Wire conforms to the following chemical analysis (%)

  Cr Ni Mo Co Al Ti B C Fe Mn Si S Cu
Min Design 17.5 -- 9.00 10.0 1.40 3.00 .003 .04 0 0 0 0 0
Max Design 20.00 Bal 10.50 12.0 1.80 3.30 .01 .12 5.00 .10 .50 .015 0.50

Other specifications:

Density: 8.25 g/cm3 (0.298 lb/in3)
Melting Point: 1345 °C (2450 °F)
Approximate service temperature: °550C (°1020F)
Coefficient of Expansion 20 °C - 100 °C:  13.6 µm/m °C (7.41 µin/in °F )
Electrical Resistivity at 20 °C:  131 µΩ-cm (Ω Circ. Mill/ft)
Modulus of Elasticity: 218.0 kN/mm2 (31619 ksi)

Temperature

0.2%
Yield Strength

Tensile
Strength

%
Elongation
in 2"

°F

°C

ksi

MPa

ksi

MPa

70
1000
1100
1200
1400
1500
1600
1700

21
538
593
649
760
816
871
927

154
147
146
145
136
118
80
50

1062
1014
1007
1000
938
814
552
345

206
203
200
194
160
126
90
58

1420
1400
1379
1338
1103
869
621
400

14
14
14
14
11
14
19
26

 

 

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