The heating wire is the heating element of the coil heater. As a core part, its choice directly affects the service life of the hot coil heater. Different working environments require alloy heating wires of different materials and grades.
There are two main types of high-resistance alloy wires used in domestic hot runner coil heater: nickel-chromium alloy wire, iron-chromium-alloy wire.
First, how to choose the heating wire?
1. Advantages and disadvantages of nickel-chromium alloy wire:
(1) Advantages: non-magnetic, anti-vibration, high strength at high temperature, not easy to deform, easy to repair.
(2) Disadvantages: Nickel is expensive and the temperature is lower than that of iron-chromium-aluminum alloy.
2, the advantages and disadvantages of iron-chromium aluminum alloy wire:
(1) Advantages: The maximum use temperature is 1400 ° C, the cost is low, the surface load is high, the oxidation resistance is good, and the electrical resistivity is high.
(2) Disadvantages: Magnetic, low strength at high temperature, easy to be deformed, and difficult to repair.
how to choose the coil heater shell?
1, in terms of performance,
(1) Focus on high temperature resistance, 304 stainless steel: below 500 °C; 321 stainless steel: below 600 °C; 2520 stainless steel below 850 °C,
(2) Focus on corrosion-resistant, 316 stainless steel tube, titanium tube, Teflon sheath tube, select the appropriate tube material according to the acid-base solution,
(3) Focus on pressure resistance, common pipe wall thickness 0.8mm: resistance to 10 kg pressure, thick-walled seamless steel pipe,