Description

The using temperature of the heating element and the resistance wire diameter also have a considerable relationship, under normal circumstances, the wire diameter should not be less than 3mm, and the thickness of the flat strip should not be less than 2mm.

If you want to know the resistance wire diameter, you need to find the resistance value according to the voltage and work, and the resistance value can be found by using voltage * voltage/power.

The corrosive air in the oven is related with the temperature of the heating element,which will influence the life of the element.

Due to the weak temperature strength of iron chromium aluminum wire, the element is easy to deform at high temperature, such as improper selection of wire diameter or improper installation, will cause the collapse of the component due to high temperature deformation, short circuit phenomenon, etc., so in the component design, it is necessary to take into account its factors.

The component that determines the resistivity of NrCr high temperature oven wire is Ni element. At high temperature, the oxide film generated on the surface of the alloy element determines the service life, after the long time using, the internal structure of the element continues to change, and the oxide film generated on the surface continues to age and destroy. The elements inside its components are constantly consumed. Such as Ni, AL, etc., so as to shorten the service life, therefore, in the selection of Nicr high temperature oven wire, thicker ribbon or standard diameter wire should be considered.

We all know that there are two types resistance wire, one is the external winding wire, that is, the heating resistance wire is wrapped around the magnesium rod. The other is directly shaped into the spring shape, and then put it into the heating tube.

Concerning how to choose the heating resistor wire,below is our suggestion for your reference:

If the purchaser is a mechanical equipment factory, sealing machine, sealing machine, packaging machine who do not require high temperature, about 200-300 degrees requirment, we suggest using 0cr20Ni80 ni cr heating wire, nicr resistance heating wire is good, soft, not easy to embrittling, and it is best to use flat tape, because the flat tape per square meter load power is larger than the round wire, the width is high. Less wear than round wire.

If the purchaser is an electric furnace factory, oven factory, etc., it is necessary to think about the temperature and temperature, 100-900 degrees, do not require high quality level, we suggest using the common fecral wire 0cr25al5, its price is cheap, the highest use temperature is 900 degrees, if making heat treatment on the surface of the resistance wire, acid white may annealing, enhance its oxidation is very good, The cost performance is relatively high.

If the furnace temperature is at 900-1000 degrees, we suggest the use of 0cr21al6nb, as this brand add the additional Nb element, higher temperature resistance, quality is also very good, if the furnace temperature is 1100-1200 degrees, suggest the use of Ocr27al7mo2, containing MO round wire and thus higher temperature resistance.

Data Sheet

Performance material		Cr10Ni90	Cr20Ni80	Cr30Ni70	Cr15Ni60	Cr20Ni35	Cr20Ni30
Composition	Ni	90	Rest	Rest	55.0~61.0	34.0~37.0	30.0~34.0
	Cr	10	20.0~23.0	28.0~31.0	15.0~18.0	18.0~21.0	18.0~21.0
	Fe		≤1.0	≤1.0	Rest	Rest	Rest
Maximum temperature℃		1300	1200	1250	1150	1100	1100
Meltiing point ℃		1400	1400	1380	1390	1390	1390
Density g/cm3		8.7	8.4	8.1	8.2	7.9	7.9
Resistivity at 20℃((μΩ·m)			1.09±0.05	1.18±0.05	1.12±0.05	1.00±0.05	1.04±0.05
Elongation at rupture		≥20	≥20	≥20	≥20	≥20	≥20
Specific heat J/g.℃			0.44	0.461	0.494	0.5	0.5
Thermal conductivity KJ/m.h℃			60.3	45.2	45.2	43.8	43.8
Coefficient of lines expansion a×10-6/ (20~1000℃)			18	17	17	19	19
Micrographic structure			Austenite	Austenite	Austenite	Austenite	Austenite
Magnetic properties			Non-magnetic	Non-magnetic	Non-magnetic	Weak magnetic	Weak magnetic

How to choose Iron chromium aluminum resistance wire or nickel chromium wire?

The resistance wire is the heart of the electric heating element, and the service life of the heating resistance wire determines the service life of the heater element, so the correct selection of the resistive wire is the promise. The two stype we used in the heating element are iron chromium aluminum wire and nickel chromium wire, then how to choose and use them?

Ferrochrome aluminum wire: Cr25Al5/25AL5 nickel chrome wire: 1560 /Cr15Ni60 namely h140 and Cr20Ni80/2080.

2. Working temperature:

Iron chromium aluminum wire: the temperature of 1350/1400 degrees; Molybdenum containing iron chromium aluminum wire about 1450 degrees; Nickel-chromium wire: The temperature below 1200 degrees.

Mostly we use iron-chromium aluminum wire, as it is lower in cost than nickel-chromium wire and has high temperature resistance. However, if the electric heating element is used in a vibration environment, it is necessary to choose nickel-chromium wire, because its flexibility is better.

Product detail

5f9b72daf3114 OIP 5fb5e63881c2f