Steel consumers and competitive market conditions are driving steel mills to produce higher quality products more cost effectively. In order to meet these demands, steel mills must implement better controls to manage the temperature and surface character of the steel strip during the annealing process, for example, high strength steels for the automotive industry require tight temperature control in order to maintain material properties and keep scrap rates and coil reheats to a minimum.
Williamson's PRO Series multiwavelength sensor is specifically developed to compensate for the challenging requirements of a steel mill annealing line. The sensor uses an ESP algorithm that considers infrared energy, emissivity, and the measured wavelengths to accurately calculate the strip temperature and the surface emissivity. The algorithm is a computer-based empirical model developed from extensive data collected from off-line simulations and on-line trials. One ESP algorithm can be used for accurate measurement of most steel alloys, including carbon steels, tool steels, dual-phase steels and high-strength steels. Additional ESP algorithms exist for stainless steel, electrical steels, coated steels, and high temperature steels.
With the ability to provide realtime emissivity measurements, the PRO-110 can be used to verify measurement conditions and to optimise the radiant heat transfer and line speeds throughout the furnace. Combined, these capabilities help to produce better quality steel more consistently and more efficiently.
There are many benefits of emissivity measurements, such as the high emissivity strip absorbs heat more efficiently, resulting in faster line speeds at lower zone temperatures. Low emissivity strip has a smoother surface texture resulting in a smoother finish. Increasing emissivity values indicate oxide growth or surface defects that could be caused by changes in the hydrogen levels of the furnace.
With the ability to measure temperature accurately under a wide range of operating conditions, the multiwavelength PRO-110 provides the flexibility to install the sensors in more locations along the annealing line for greater control of process temperatures. The PRO-110 is used in straight-pass furnaces, serpentine-pass furnaces, hot dip lines and galvanneal lines.
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