Silicon Carbide Radiate Pipe

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4Provide customers a comprehensive purchasing platform of industrial and electric heat ceramic products Description Introduction of heater tube: The product is ued in controllable aural various heat treatment furnace,to avoid the contact of elding burning outcome or to avoid the corrosion of furnace gas to heating element.The process(the conversion of elding burning or electric energy) is put into refractory steel tube and let amount of heat radiate by wall of tube.This device is called as heater tube. Electrothermal heater tube will close the heating element in the jacket,after electrify and heat up,the heat is indirectly radiated to furnace liner and workpiece to be heated by bushing.The heat up of heater tube is used in furnace with going protecting aural and corrodent aural,such as continuous furnace,roller furnace, pit furnace. Twist and turn resistance wire in axial direction,that is,the single resistance wire is bended to U shape,then in series or parallel connection mutually.This kind of electrothermal heater tube is called bending resistance wire heater tube.This tube,because fall of screening of resistance wire,in intratubal upper surface load,can insure prolong life span. The advantages of tube: The controllability of aural inside furnace can be guaranteed. The control of temperature,assemble and maintainace are very convenient and can be easy to sealed. The cubage of hearth is enlarged and throughput is improved because of no muffle pot Strong heating ability and high efficiency The refractory steel material is save. The material of tube:
The electrothermal alloy material that heating tube apply should be of higher resistance rate.The percent conversion of galvanothermy is high.Because the heating tube is put in the bushing,the process of heat transmission is different from that of open type heating element.Its heat shield is big.The temperature of element must be controlled at the course of temperature rise,to avoid temperature excursion of element. When the heater tube is closed and heated,the surface temperature of heating element is higher roughly than temperature of hearth by 100 C~150 C.So temperature of furnace and atmosphere of temperature of furnace are needed to analysed.Choose correct heating material.  The heater tube produced by gongtao company often apply Cr20Ni80,Cr25A15,Cr21A16Nb,Cr27A17Mo2 ect. Chemical content of each material is as below:

Item	Cr	Ni	AI	Mn	P	S	C	Fe
Cr20Ni80	20-23	margin	≤0.5	≤0.6	≤0.02	≤0.02	≤0.08	≤1.0
Cr25A15	23-26	≤0.06	4-7	≤0.07	≤0.02	≤0.02	≤0.06	margin
Cr21A16Nb	21-23	≤0.06	5-7	≤0.07	≤0.02	≤0.02	≤0.05	margin
Cr27A17Mo2	26-28	≤0.06	5-7	≤0.02	≤0.02	≤0.02	≤0.05	margin

Cr20Ni80 is used between 500 C and 800 C,because of steady,single even solid fusant form,It has good normal temperature and high temperature mechanics property,even electric physical property and good machining technics property.Low use temperature,long life,no easy damage ect are different from Cr27A17Mo2 electrothermal alloy material. Cr25A15,Cr21A16Nb,Cr27A17Mo2 is used between 800 C~1200C.The use temperature of these three material is hoisting in turn. Plasticity is low.High brittleness is the biggest shortcoming of Cr27A17Mo2.Especially when 400°C-800°C,long use will make material precipitate “CrFe” type metal compound,which arose sharp fall of alloy plasticity. Severe embrittlement phenomenon will appear.So Cr27A17Mo2 electrothermal alloy material carry through formation,process and use,kept away from in this temperature range Product Photo Recommond Product 99.7% alumina (al2o3)Square Crucible With Rectangular Lids