Infrared thermography of TMCP microalloyed steel skelp at upcoiler and its application in quantifying laminar jet/skelp interaction

Abstract

A series of area temperature maps were obtained from the upper surface of a moving thermomechanical controlled processed (TMCP) microalloyed steel skelp following laminar cooling using an infrared video camera. In addition, an emissivity probe was used to obtain both the emissivity and temperature at the mid‐face of the moving skelp. Properly sampled infrared camera temperature measurements correlated well with both the measured probe temperature and with the process control pyrometer. A finite element thermal model of the system, in conjunction with the transverse skelp temperature profiles obtained from the infrared camera, was used to quantify the size and shape of the laminar cooling water jet’s direct impact zone on the skelp. The region experiencing direct water impact was found to be constrained by the residual water present on the moving skelp.

Keywords:

• Infrared thermography
• Emissivity probe
• Video
• TMCP
• Finite element
• Accelerated cooling
• Microalloyed steel

The authors would like to thank Evraz Inc. NA for allowing access to their plant. The authors would also like to thank NSERC and Evraz for financial support and L. Collins of Evraz for facilitating this work.