Billet Inspection and Conditioning Facilities Aug20

Billet Inspection and Conditioning Facilities...

 Billet Inspection and Conditioning Facilities A considerable percentage of steel bars and wire rods are used for the safety-related parts of automobiles after undergoing post-processing steps (secondary and ternary processing). Quality requirements for these steel bars and wire rods are becoming increasingly diversified in consideration of the workability at the stage of secondary and ternary processing and the use conditions of the machine parts into which they are made. In addition, the need for quality assurance throughout the entire length of the steel bars and wire rods has also increased, and the steel plants are required to apply very severe quality standards for meeting these requirements. Due to this reason, the importance of the reliability of inspection and conditioning of billets which is the starting material for the production of steel bars and wire rods has increased significantly. Depending on the application, billets require surface inspection and conditioning to minimize the surface imperfections. Standard inspection methods consist of visual inspection of the billet surface under white light conditions or wet magnetic particle inspection under black UV lighting. Normally steel plants shot-blast the surface of the billet to remove the mill scale and to improve the visibility of the surface, depending on the type of surface conditions they are trying to detect. The surface imperfections are normally marked as they are detected, and these locations are conditioned. Methods employed are usually machine- grinding and sometimes scarfing. The traditional inspection techniques (other than visual method), which have been aligned to the rolled billets, are all conditioned to the detection of defects which have a significant length component, i.e. seams, rolling laps, tonguing, etc. Continuously cast billets contain, on the other hand, a completely different type of defects such as pinholes, corner tearing, reciprocation marks, entrapped scum,...