Table of Contents

    • 56

    • Increasing Mill Production Using Medium-Voltage AC Drive and Active VAR Compensation

      In 2011, Nucor Steel Tuscaloosa replaced its Steckel drums and upcoiler DC motors with new 1,500-kW AC induction machines fed from new voltage source inverters. As a result, the voltage variations were reduced during heavy load from the DC drives, and additional overload torque was available for the main stand DC motors. This paper describes the control strategy used in the converter and the improvement of the power system performance.

    • 67

    • Preparing Your Electrical System for Disaster Recovery

      Contingency planning for continued business operations is a multi-faceted risk management function. While natural disasters cannot be avoided, their impact may be somewhat lessened if businesses are better prepared. This paper identifies pre-planning exercises companies can complete to help restore electrical distribution and control equipment efficiently and safely.

    • 74

    • A Study of an Improved Overhead Crane Wheel Flange Lubrication System

      This paper discusses a microporous polymeric lubricant (MPL) system for reducing wheel flange wear. Described are the results of a study which demonstrates that MPL arcs are an effective lubricant for overhead crane wheels in an automotive assembly plant. The improved lubrication system will result in savings from reduced production downtime and maintenance costs.

    • 90

    • Effects of Dezincification on Continuous Caster Spray Nozzle Assemblies

      Several instances of ghost lines occurred at a continuous caster at U. S Steel – Gary Works. These incidents were traced to the malfunction of water spray nozzle assemblies (SNAs) in the bender segment. Unusual cracking of some SNAs was found to be caused by dezincification. This paper explores the metallurgy of the dezincification mechanism and the effects of the SNA cracking on the spray cooling.

    • 208

    • Characterization of Zinc Coating Deposited Using Electrolytic Plasma Technology

      Zn coating was deposited on high-carbon steel wire using electrolytic plasma technology. It was determined that the pure Zn coating does not contain any intermetallic phases as observed in hot-dip galvanized Zn coatings. The lack of intermetallic phases in the coating imparts superior mechanical properties and eliminates some of the existing problems with available Zn-coated products.