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INDUSTRIAL HEATERS
Specialist in : Custom Built Heaters & Heater Assembly Unit along-with
Temperature Controller as per Customer’s Specification
AN ISO 9001:2015 COMPANY
CERTIFIED CO.
Zero Effect Zero Defect
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Company Profile
“SUBHOT” the brand name of Three Decades Rich, quality oriented and completely indigenously manufactured
IEC standard product since 1990, we are catering successfully to domestic and international Industries. We
design develop and supply industrial heaters, heating elements, thermocouples and other high temperature
Material Management equipments as per the customer's requirement. We have in house Design, Development &
research facilities, follows by stringent quality control measures right from beginning to delivery of the material.
Customer satisfaction is our first priority.
We manufactur various types of Tubular Electrical Heaters and heating systems, along with control accessories
Cartridge Heaters, Mica Band Heaters, Ceramic Band Heaters, Casted Heaters, Furnace Heaters, Nozzle Heaters,
Coil heaters, which are used in Hazardous and Non Hazardous area. In Tubular Electrical heater Heating element
is Mineral filled sheathed tubular type. Heating element Insulation material used is Mgo (Magnesium oxide) and
heating element wire material is Nichrome. Heating elements are manufactured and tested as per IS-4159 BIS
Standards. Electrical heaters are suitable for application for Water, Oil, Chemical, Air, Fuel gas, Natural gases etc
and Design as per requirement of customer based on the technical input provided by them.
Heating unit consist of Heater vessel, Heater bundle, Terminal box, and U-Shaped heating element fitted on
Tube sheet .The selection of heating element for a particular assembly depends on the uses & customers
requirement total rating, surface loading, diameter of heating element tube, Operating temperature, space
limitation, Type of electrical connection and number of bank etc. The heating element can be permanently fixed on
tube sheet OR Can be removable type. Various Sheath material and sizes are available based on design
requirement. The heating unit can be supplies Complete with Heater Vessel, Inlet-Outlet Nozzle/Flange, Lug
Support and external insulation.
Heater vessels are generally designed as per ASME SecVIII Div-1. For Hazardous area flameproof terminal box
are used which are duly certified by CMRI Dhanabad for Gas group IIA, IIB or IIC.
We are also manufacturing the following product at our works:
Immersion heating elements for Water, Oil and Chemical heating.
Air Heating element
Fuel gas and Process gas heater.
Regeneration heaters.
Large heating unit upto 520KW with terminal box and control panel.
Heater for ESP and Ash handling system.
Cartridge Heaters
Mica Band Heaters
Ceramic Band Heaters
Casted Heaters
Furnace Heaters
Size of heating tube: 8.2mm, 9.5mm, 11.0mm, 12.0mm, 12.5mm, and 16.0mm,19.0 mm or as per
customer requirement.
MOC of Heating Tube: Copper, Titanium, SS all grade, Incoloy 800,Inconel etc.
Sizing of Tube Sheet: As per design requirement.
Sizing of Heater Vessel: As per design requirement.
Thermocouple: J & K Type own make in SS all grade and Incoloy.
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Silicon Carbide Heating element
Product Introduction
“Subhot” silicon carbide heating elements is a company with unique formula and advanced production
technology and manufacturing. With the cold end resistance is very small, the hot end red uniform,
good oxidation resistance, strong corrosion resistance, good thermal shock resistance, thermal
expansion coef icient, good creep resistance, radiation ability, fast heating speed, high thermal ef iciency,
easy installation and maintenance characteristics, widely used in metallurgy, machinery, chemical,
semiconductor, ceramics, galss, food and textile industry etc
“Subhot” silicon carbide electric heating elements maximum temperature of up to 1600 degrees, can be
used for furnace temperature between 600-1500 degrees of electric furnace and electric tunnel kiln.
Production of diameter 8mm-70mm, length 300-6000mm of different speci ications of silicon carbide.
“Subhot” silicon carbide electric heating elements of all varieties, excellent quality, low price, the products
are sold all over the country,
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GC-Type Silicon Carbide rod
D: Heating diameter
I: Heating length
M: Cold and length
D: Cold and diameter
N: Aluminum spray length
L: Total length
m1
Marks:GC: d/i/m/D If the two ends of the cold ends are not equal, GC: d/Im1/ /D
m2
GD-Type Silicon Carbide rod (equal diameter type sic rod)
Single temperature zone sic rods
D: Diameter
I: Heating length
M: Cold and length
D: Cold and diameter
N: Aluminum spray length
L: Total length
m1
Marks:GD: d/i/m If the two ends of the cold ends are not equal, GD: d/I
m2
GD-Type Double-temperature-zone Silicon carbide rods ( ive-section rods)
D: Heating diameter
m1/m2/m3: Cold and length
I1/l2: Heating length
N: Aluminum spray length
L: Total length
Marks:GD- Type Double-temperature-zone silicon carbide rods ( ive-section rods) d/m1/l1/m2/l2/m3
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GDU-Type silicon carbide rod
D: Heating diameter
I: Heating length
M: Cold and length
E: Center distance
N: Aluminum spray length
L: Total length
Marks: GDU-type: 2 x d/l/m/E
GDU-Type Silicon Carbide rod
D: Heating diameter
I: Heating length
M: Cold and length
E: Center distance
D: bridge length
K: bridge width
N: Aluminum spray length
L: Total length
Marks: GDU-Type 2 x d/l/m/E/D--K
GUN-Type Silicon Carbide rod
D: Heating diameter
I: Heating length
M: Cold and length
E: Center distance
F: extension length
N: Aluminum spray length
L: Total length
Marks: GDU-Type 2 x d/l/m/E--F
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H-Type silicon carbide rod
D: Heating diameter
I: Heating length
M: Cold and length
E: Center distance
F: extension length
N: Aluminum spray length
L: Total length
Marks: H-type: 2 x d/l/m/E--F
GDS-Type Silicon Carbide rod (triphase rod)
D: Heating diameter
I: Heating length
M: Cold and length
E: Center distance
D: external diameter of bridge
K: bridge width
N: Aluminum spray length
L: Total length
Marks: GDU-Type: 2 x d/l/m/D--K
GUN-Type Silicon Carbide rod
D: Outer diameter
D: Tube diameter
I: Heating part
M: Cold end
N: spray aluminum length
L: Total length
Marks: single threaded silicon carbon tube D/dx1xm
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Chemical property
Chemical composition:
silicon carbide is recrystallized silicon carbide products at high temperature,
is a kind of non metal high temperature electric heating element.
Chemical composition of silicon carbide heating part belows:
Physical property
Item Unit Value
Density g/cm³ 2.6
Porosity % 18.20
Flexural Strength Mpa 50
Hardness mohs 9.8
Thermal Expansion 10- K- 4.8
Speci ic Heat C 0.183
Thermal Conductivity C 0.0365
Heating Resistivity(1050 C) mm²/m 700-1500
cold and Resistivity (20 C) mm²/m 18-24
Emissivity 0.9
SiC Fe O Al O Si+SiO C
% 98.5 0.5 0.2 0.4 0.3
1. The Resistance value of silicon carbide largely affected by temperature. Between 0.850 C
the resistance temperature is negative, above 850 C present positive value.
The resistance is measured at the temperature of 1050 C +_ 50 C.
2. Characterisitic curve of the temperature resistance. With the increase of the temperature,
it show a nonlinear variation.
3. Mode of connection: Triangle ( ) connection; star (Y) connection; Series connection ; Parallel
connection; Parallel series; String association.
4. The relationship between the surface temperature resistance and the speed of increasing.
5. The relationship between carbon surface temperature, furnace temperature, the density
of surface load.
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w/cm² 1400 1300 1200 1100 1000 900 800 700 600 500 400 300 200 100
1500 10.23 18.74 25.88 31.65 36.27 39.95 42.78 44.93 46.50 47.62 48.38 48.86 49.16 49.31
1400 8.55 15.61 21.40 26.02 29.70 32.50 34.67 36.25 37.28 38.13 38.61 38.90 39.06
1300 7.05 12.85 17.47 21.15 23.35 26.12 27.70 28.82 29.58 30.06 30.35 30.51
1200 5.79 10.41 14.09 16.83 19.06 20.64 21.74 22.52 23.00 23.23 23.45
1100 4.62 8.30 11.10 13.27 14.85 15.86 16.73 17.21 17.50 17.66
1000 3.68 6.48 8.65 10.23 11.35 12.11 12.59 12.88 13.04
900 2.80 4.97 6.55 7.67 8.43 8.91 9.20 9.36
800 2.17 3.75 4.87 5.63 6.11 6.40 6.56
700 1.58 2.70 3.46 3.94 4.23 4.39
600 1.12 1.88 2.36 2.65 2.81
500 0.76 1.25 1.54 1.69
MoSi2 Heating element
Introduction
MoSi2 heating element is a comprehensive production technology in domestic and abroad. The utility
model is a high temperature electric heating element which is made of two molybdenum silicide, The
utility model is matched with the heating mode, and the maximum temperature is up to 1850 C
Components are widely used in metallurgy, glass, electronics, ceramics, magnetic materials, refractories
and other industries. According to the shape can be divided into I type, U type, W type, can also be made
according to customer needs, right angle, bending angle and other special-shaped products.
Marks : GM-1d l l
l : Hot and length
l : Cold and length
GM-I Type d : Hot and diameter
d : Cold and diameter
n: Aluminum spray length
L: Overall length
Marks : GM-U d l l /E
l : Hot and length
l : Cold and length
d : Hot and diameter
GM-U Type d : Cold and diameter
E: Center distance
n: Aluminum spray length
L: Overall length
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Marks : GM-W d l l /E
l : Hot and length
l : Cold and length
d : Hot and diameter
GM-W Type
d : Cold and diameter
E: Center distance
n: Aluminum spray length
L: Overall length
GM-I Type GM-U Type GM-W Type
GM-Right Angle GM-Bending Angle GM-Special -shaped
Clamping Apparatus
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Physical Property
The components are both hard and brittle at high temperature, and the lexural strength is low.
The element is softer heating to 1350 C, can be bent into a desired shape at high temperature.
Repture Vickers Stomatal Water Thermal
Density
Strength Hardness Number Absorption Extension Length
5.6g/cm³ 1.5g/cm³ 1200g/cm³ 7.4% 1.2% 4-5%
Chemical Property
The element is heated to a high temperature under the oxidizing atmosphere, and the surface a
formed with a dense silicon dioxide protective layer, so as to prevent the oxidation of the silicon
dioxide. The components should not be used for a long time in the range of 400-700, because under
this condition, the element will be oxidized at low temperature, resulting in the destruction of components.
The operating temperature of components in different atmospheres:
Furnace atmosphere Maximum operating temperature
NO Co O Air 1800 C
HE Ar Ne 1750 C
So 1700 C
CO N2 1600 C
wet H 1500 C
dry H 1450 C
Resistance Characteristics
The resistance of molybdenum silicide electric heating element increases rapidly with the
increase of temperature. Under normal circumstances, the component resistance does not
change with the length of operating time, so the new and old components can be mixed use.
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Surface Load
According to the structure of the furnace, furnace atmosphere and furnace temperature, the correct
choice of components and surface load is the key to achieve the longest life. The following diagram
shows the relationship between furnace atmosphere, the temperature of the element and the
surface load under the condition of the non thermal radiation.
Installation
Components at room temperature is brittleness, high temperature and plasticity, so the product is
generally made of U vertical suspension installation. According to the need and the heating module
complete collocation, can also use other installation method. When the installation of the part of the
cone must be extended to the furnace, the cold and of the ixture can not be screwed too tight at the
begining time, to be elevated to the high temperature when the screw again, because when the
component is not easy to break a certain plastic. In order to prevent the vertical component and the
bottom contact, the distance between the component and the bottom should not be less then 25mm.
The thermal insulation performance of electric furnace roof must be better and the temperature of the
furnace top should not exceed 300 centigrade. In order to prevent the chuck from overheating, the
contact voltage between the clamping wire and the component should be less then 0.1V, and the
distance between the lower and of the chuck and the stopper should not be less then 50mm. In order o
avoid damage to chuck, general 6/12mm components can be used for long time under 170A the
9/18mm element can be used for long time under 300A.
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ENTERPRISES
SUBHOT ENTERPRISES PVT. LTD.
Address : Plot No. 51/10, Madhuban Bapudham Industrial Area,
Meerut Road, Ghaziabad, 201013 (U.P.)
Email- sales@subhotheaters.com , Contact : 9311163794, 9310505133,
info@subhotheaters.com , 9811263790, 9999710818
Website- www.subhotheater.com
