Temperature Measurement

Infrared temperature sensing in steel processing applications

June 2018 Temperature Measurement

In the iron and steel industry, and in many foundry applications, temperature measurements show whether processes are operating within their proper ranges, whether a re-heater is too cold or too hot, whether a stand needs adjusting, or how much cooling should be applied. Each stage must be accurately monitored, so the steel retains the correct metallurgical properties as it travels through the process.

Every section of the steel manufacturing process can benefit from infrared thermometers and the customised applications developed by Fluke Process Instruments (formally Raytek and Ircon). These benefits include: higher quality products; increased productivity; reduced energy costs; enhanced worker safety; reduced downtime and easy data recording.

Increased functionality and greater control

Infrared sensors take temperature measurement one step further. Fast and accurate analog and digital output allows temperature data to be integrated into control systems and simultaneously output for remote temperature monitoring and analysis. Smart sensors, with digital electronics and 2-way communications, can be configured remotely from the safety of the control room, especially important for metals with changing emissivity. The result: increased functionality and greater control.

A wide range of optics covers an enormous variety of applications supported by integrated through-the-lens sighting, plus either laser or video sighting for correct target location. Infrared thermometers are used in many iron and steel applications including:

• Continuous casting: accurate real-time temperature monitoring coupled with the ability to adjust water nozzles and water flow rates allow for proper cooling, which helps maintain metallurgical properties. Fixed sensors, fibre optic sensors and line scanners are standard in this application.

• Reheating: reheating steel to a uniform temperature is critical so that deformation does not occur. Uneven heating strains milling equipment and increases maintenance downtime. Measuring inside a re-heater with a series of temperature measurement devices gives an operator the ability to check the overall temperature and burner efficiency, while being able to correct the process results in a more efficient use of fuel. Once the slab or billet exits the reheat furnace, ratio thermometers or line scanners (for wide slabs) transmit temperature data immediately to an operator or controller allowing mill operations to be adjusted to their correct settings.

• Rolling mills: the diversity in the types of hot rolling mills and the number of types of stands in a process vary according to the type of product being manufactured. Scale breakers, rolling stands, down coilers and coil boxes are a few areas for the utilisation of IR temperature measurement and scanning.

• Cold mills: coiling is also often done at the end of the finishing stands after cooling, and the coiled steel is transported to cold mills in another area in the plant or shipped to other facilities. Cold rolling makes a product thinner and smoother and is done while the steel is around 100°C, or at room temperature. Sensors mounted between each finishing stand allow the operator to detect temperature changes that require any adjustments.

Rod and wire mills

In a typical rod and/or wire mill, billets are reheated and sent to a rolling mill to be reshaped as rods. From here the rods go through a series of intermediate stands that reduce the rods to different sizes. Finishing stands reduce and smooth the rods into a product that can be further processed into hundreds of different products. Reheating a billet to a uniform temperature is critical to the entire process as uneven heating strains milling equipment and increases maintenance downtime.

Knowing the temperature of the product at each stand allows the operator to adjust the rollers accordingly. When the product heads for the cooling area, cooling is rapid but carefully monitored to make sure the metallurgical properties are correct. If cooling is improperly controlled, the product would not meet specifications and could be downgraded or scrapped.

In some processes, the high speeds and vibrations of narrow rod or wire products make temperature measurement difficult. High-performance infrared ratio thermometers solve this problem. Even when the target drifts in and out of the field of view, or is partially obscured, the Marathon sensor will still take accurate temperature measurements.

Other processes

Infrared provides temperature measurement solutions exist for every step in the steel treatment and manufacturing process, from coke ovens and blast furnaces to annealing mills and coating mills. In fact, wherever temperature is to be measured, from the raw material to the finished goods, there is probably an infrared, non-contact solution.

The fixed units and portables form Raytek and Ircon are well known industry standards. The scanners from both companies can come as complete applications packages with tried and tested software to fit perfectly into many industrial applications. Continual innovation and new products like the Endurance series, designed in conjunction with Raytek and Ircon, will ensure that solutions can be found for every application.

For more information contact R&C Instrumentation, 086 111 4217, info@randci.co.za, www.randci.co.za


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