A perennial problem in steel producing and fabricating plants is the maintenance of the identities of each of the many varieties of steel produced daily. There are more claims entered because of wrong-grade or mixed-steel shipments than for any other reason. Usually, these claims are not the result of mixes between similar grades but between grades that differ significantly in chemical composition and/or physical properties. This paper reviews the conventional practices employed in steel plants to avoid mixes, describes the equipment and techniques used to verify steel grade, and outlines a typical grade-tracking system. It discusses state-of-the-art technology in grade verification and postulates a system for automatically tracking steel grade through a steel producing plant.
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