Product Details

Radiant Tube

Brief

For most of heat treatment process, atmosphere passed into furnace will corrode electrical heating element. To ensure the normal operation under special working environment, we need to protect the resistance wire or resistance tape effectively. Combining resistance wire or resistance tape and high temperature insulation pottery bracket into heating core, the heating core will electrify and heat inside high temperature resistant and corrosion resistant protective tube and conduct heat by protective tube to furnace space and workpiece.

User benefits include superior resistance to, for example, carburization, thermal shock, sagging and distortion. This is due to the materials' excellent mechanical properties and their capability of forming a dense and adhesive oxide film that protects against corrosion and atmospheric attack.

Application

Widely used in heat treatment equipment, auto parts, iron and steel manufacturing,aluminum industry, metallurgical equipment, petrochemical equipment, glass machinery, ceramic machinery,food machinery, pharmaceutical machinery, power engineering industry, and residential appliances.

Advantages

Excellent form stability

Excellent corrosion resistance in most atmospheres

High thermal conductivity

No scaling and impurities

Longer tube life

Suitable for extremely demanding environments

Technical parameters

Power : 2KW to 40 KW

Working voltage: 30V to 220V

Useful length: 900 to 2400mm

Outside diameter: Φ 80- Φ 280

Main grades and properties

Alloy performance	Material	Cr20Ni80	0Cr25AL5	0Cr21AL6Nb	0Cr27AL7Mo2	1Cr13AL4	0Cr21AL6	0Cr23AL5	0Cr21AL4
Main chemical composition	Cr	20~23	23~26	21~23	26.5~27.8	12~15	19~22	20.5~23.5	18~21
	Ni	23~26	≤0.06	5~7	6~7
	AL	21~23	4.2~5.3	5~7	≤0.07	4~6	5~7	4.2~5.3	3~4.2
	Mn	26~28	≤0.06	5~7	≤0.02
	P	≤0.02	≤0.02	≤0.08	≤1.0
	S	≤0.02	≤0.02	≤0.06	rest
	C	≤0.02	≤0.02	≤0.05	rest
	Fe	≤0.02	≤0.02	≤0.05	rest	rest	rest	rest	rest
Max Temperature (℃)		1000	1250	1350	1400	950	1250	1250	1100
Resistivity at 20℃(Ω·m)			1.42	1.45	1.53	1.25	1.42	1.35	1.23
Density(g/cm3)			7.1	7.1	7.1	7.4	7.16	7.25	7.35
Thermal conductivity (KJ/m·h·℃)			46.1	46.1		52.7	63.2	60.2	46.9
Coefficient of linear expansion (α×10-6/℃)			16	16	16	15.4	14.7	15	13.5
Melting point (℃)		1500	1500	1510	1520	1450	1500	1500	1500
Tensile strength (N/mm2)			630-780	650-800	680-830	580-680	630-780	630-780	600-700
Elongation at rupture (%)			>16	>12	>10	>16	>12	>12	>12
Variation of area (%)			60-75	65-75	65-75	65-75	65-75	65-75	65-75
Repeat bending frequency(F/R)			>5	>5	>5	>5	>5	>5	>5
Hardness(H.B.)			200-260	200-260	200-260	200-260	200-260	200-260	200-260
Micrographic structure		ferrite	ferrite	ferrite	ferrite	ferrite	ferrite	ferrite	ferrite
Magnetic properties		magnetic	magnetic	magnetic	magnetic	magnetic	magnetic	magnetic	magnetic

Remarks: we also provide special designed radiant tube according to customer needs.