Abstract
Sumitomo Metal Industries, Ltd. (SMI) has developed a new temperature measurement method (Fountain pyrometer) and an associated control system, for hot strip cooled by water in cooling banks.High tensile steel is seeing increasing use in lightweight cars to improve fuel economy and reduce CO2 emissions. Reliable material quality of hot strip products, including high tensile steel, requires good temperature control on the run-out table. The conventional control method is not good enough because the temperature of a hot strip cannot be accurately measured in the cooling banks, where the cooling water interferes with thermal radiation from the hot strip surface.SMI has developed the Fountain pyrometer, which uses a water purge to stabilize the passage of thermal radiation from the hot strip surface. Experiment confirms that Fountain pyrometers can reliably measure hot strip temperatures above 360 degrees Centigrade even in cooling banks with a great deal of cooling water. The response time of Fountain pyrometers is 10 or 20 ms. SMI has also developed a new control system using Fountain pyrometers, a combination that allows very precise temperature control of hot strip on the run-out table.
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