Molten iron stream temperature measurement at the tap hole exit
Dual-wavelength pyrometer working in near wavelengths between 0.7….1.15 μm compensates for dirty optics and intermittent disturbances like dust and smoke. Due to movement of equipment and working labour, most of the time pyrometer needs to be installed at long distance. Advanced optical scheme and through the lens sighting makes the system perfect to install even in long distances without deviation in accuracy of measurement. Heavy-duty water-cooling jacket with integrated air purge unit and quartz protection window to with stand harsh steel industry application.
To measure the temperature of refractory of the stove dome. The Stoves are used to heat the air. The hot blast air is then supplied to the blast furnace to achieve the process temperature which is essential to produce iron.
To measure the temperature of refractory vessels of Ladle. The Ladle is preheated before pouring the molten metal into it. Preheating of the ladle is essential as it helps to withstand the thermal shock of molten metal to the ladle and prevents its refractory linings of it from getting damaged. The ladle should be preheated to an optimum Temperature. If the ladle is cool, then the metal will explode from the sides of the vessel which hampers the safety and can be lethal. If the ladle is heated to a lower temperature refractory may crack. Very high-temperature heating of the ladle results in the decrease of the insulating properties of the refractories.
To measure the molten steel temperature inside the Ladle.
After the preheating of the ladle, the molten metal is transferred to the Ladle. It is essential to know the temperature at this stage also.
Molten Metal String Temperature Measurement during Ladle Pouring into Tundish. Molten metal is poured from Ladle into Tundish to be used for other processes such as Casting etc. The temperature measurement is crucial for the homogenous quality to be maintained in further processes as well.
Within the spray, chamber exists a very harsh and unfriendly environment.
Some of the common conditions/problems which exist inside the spray chamber are as follows:
AST’s pyrometer system “AST Concast” is designed in such a way that it can be easily installed in the spray chamber to view the strand between rolls. The system includes
Two Colour Fibre Optic Pyrometer A450- C FO/PL/A250+/A450+ with 10mtr long fibre optic cable Two color (Ratio) technique helps to overcome the inaccuracies due to atmospheric disturbances like Water vapor, Dust and Contamination on lens etc. Fibre optic system allows installing the pyrometer securely inside the control box away from the site which has high ambient conditions.
The digital output of the pyrometer is connected to the temperature controller with Parameterize so that all the parameters of the pyrometer can be set without the help of a PC or laptop computer. The auxiliary output of 24 V DC from P120 is used to power the pyrometer. Hence the system is Standalone and user-friendly. Pyrometer has laser targeting light which can be turned ON/OFF via Programmer P120.
Billet temperature measurement before entering the rolling
After Quenching at the cooling bed.
At the cooling bed, temperature equalizing takes place at around 600ºC. This makes the surface of the re-bar a hardened structure. The core remains soft. Monitoring and controlling temperature at each stage is important to maintain the quality of Re-Bars. Cooling is an important factor here. To ensure the retention of all the metallurgical properties of the steel the cooling should be fast as well as controlled. Lack of control in the cooling will lead to the formation of scrape/wastage material. This will hamper the quality of the product. Installation of the pyrometer at this level helps in the Retention of the metallurgical properties of the steel, helps in monitoring a variety of rod/bars with different diameters and in carrying out continuous temperature measurements.
Recommended Product for the application
A250 is specially designed highly accurate digital pyrometer to provide high Performance and low maintenance of non-contact temperature measurement in demanding industrial environments. This pyrometer has solid body in stainless steel housing which provides high operation safety even in rough industrial environment. Variety of working Distances with fixed focus available for different applications.
Bright Annealing Process of Stainless-Steel Tube
Bright annealing is a critical production process. If proper annealing is not done tube surface can crack, stained, and may lead to easy corrosion. In this process the stainless tube is heated to high temperatures in presence of inert gases. Annealing is done to reduce the hardness of the steel to attain ductility for further processing.
The tube comes out of welding, sizing, and degreasing unit and finally enters the closed annealing chamber. In the closed annealing chamber, the stainless tube is heated to high temperature by induction coils in reducing atmosphere of inert gases like Argon/Nitrogen and Hydrogen gas. After some time, the red-hot tube exits from the closed annealing chamber and is subjected to rapid cooling. After the tube exits the chamber, it finally goes into the last stages of sizing and straightening
Solution to the Application
AST Pyrometer model A250/A450/A250+/A450+ is suited for this application. The AST A250/A450/A250+/A450+ is mounted over the safety glass-protected observation window of around 10mm thickness. The Pyrometer is wired to a temperature indicator which shows the temperature of the tube leaving the induction coil.
Installation of our AST Pyrometer system at Annealing chamber plant.
The electronic assembly is protected by IP65 rugged stainless-steel housing. The pyrometer is provided with “Infrasoft” PC software for remote data logging and parameter setting. Pyrometer has user selectable analogue output 0/4…20mA, 0…10V and digital output RS-232 and RS-485. When connected to PC using USB port, pyrometer works stand-alone without any external power supply.
Temperature measurement after dipping strongly influences the final appearance and quality of the coating. It also enhances the maximum line speed. There is the number of reasons for the non-uniform appearance. A steel part with both dull and shiny coating can also be the result of a different cooling rate. The use of a rapid quench after dipping can stop the formation of the grey or alligator coating. The phenomenon of peeling can also be seen if work cools too slowly, such that the temperature remains above 288°C for periods over 10 or 15 minutes, the pure zinc layer may peel off the work.
Induction hardening is a heat treatment process employed for the surface hardening of metal using electromagnetic induction to produce heat. Accurate temperature measurement is required for maintaining the quality of the metal.
Fibre Optic Pyrometers with fast response time and small spot sizes are recommended for accurate temperature measurement between the windings of the induction coil.
A250+/A250/A450 FOPL Fibre optic pyrometer perfectly suits the application as the optics and the Fibre cable doesn’t contain electronics so they can be easily mounted close to the process. There is no interference from a strong electromagnetic field. The Fibreoptic pyrometers are equipped with laser pilot light for sighting. The software Infrasoft enables remote parameter setting. Accessories for mounting help in easy installation. The air purge unit prevents the contamination of the lens to ensure long-term operation.
Measurement of the Iron Stream temperature
The temperature measurement of pouring iron stream is crucial for achieving high-quality cast products. A two-colour pyrometer with Fibre optics AST 450C FO/PL and IR CAST 2C+ is recommended for this application due to conditions like very low and fluctuating emissivity along with the continuous moving and changing the position of the of an iron stream. The pyrometer is specially designed for the reliable temperature measurement of Iron Stream in Cast houses. Two-colour (Ratio) technique helps to overcome the inaccuracies due to atmospheric disturbances like water vapour, dust, and contamination on lens etc.
Pyrometer has laser targeting light which can be turned ON/OFF which helps the user for precision targeting. The digital output of the pyrometer is connected to temperature controller with parameterize so that all the parameters of the pyrometer can be set without the help of a PC or laptop. The auxiliary output of 24VDC from P120 is used to power the pyrometer. Hence the system is standalone and user friendly.
A250 FO/PL is the recommended product for this application.
Pyrometer has laser targeting light which can be turned ON/OFF which helps the user for precision targeting. The digital output of the pyrometer is connected to temperature controller with parameterize so that all the parameters of the pyrometer can be set without the help of PC or laptop. Auxiliary output of 24VDC from P120 is used to power the pyrometer. Hence the system is standalone and user friendly.
The whole system consists
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