As part of the multi-technology order valued in excess of US$ 650 million, Nucor Corporation has selected Danieli to supply technological equipment and automation for two installations.
The first order, a new Pickling Line and Tandem Cold Mill -PLTCM and temper mill, will complete the QSP-DUE quality hot-strip plant just awarded to Danieli and to be installed in West Virginia. The new PLTCM plant will process 2.3 Mshtpy of hot-rolled strip, 0.80- to 6.35-mm-thick, up to 1,982-mm-wide, into 0.25- to 3.05-mm-thick cold-rolled strip for both construction and automotive products. The pickling line will be characterized by the patented Turboflo technology, for highly efficient scale removal and high- and adjustable-turbulence on both strip surfaces, at speeds up to 250 m/min.
Coupled with the pickling line, a five-stand tandem cold mill featuring Danieli original, 6-hi Optimized Shaped Roll Technology (OSRT) will ensure optimal strip flatness, thickness control and performance stability at speeds up to 1,200 m/min. A 0.45 Mshtpy stand-alone temper mill to improve material formability, flatness and surface finish grades in wet tempering mode will complete the Danieli supply for this new cold-mill complex.
Nucor Corporation: second order for Crawfordsville
A second order for cold-strip technology has been placed with Danieli for the supply of a galvanizing line and a color-coating line to be installed at the existing plant in Crawfordsville, Indiana. Featuring Kohler’s X-jet zinc air-wiping system for quality and coating weight control and Danieli Centro Combustion horizontal annealing furnace, the line will process 1,575-mm-wide and 0.25-1.75-mm-thick strip with galvanized (GI) and galvalume (GL) coatings. Danieli X-Jet technology allows for extremely accurate and uniform final zinc coating-thickness control, down to 36 g/m2 per side at 170 mpm. A Q-Robot Zinc will skim the surface of the zinc bath, removing and handling dross, reducing human activity in the zinc-pot area.
The color-coating line will produce 0.25 Mshtpy of coated strip up to 1,575 mm wide and 0.25-1.75 mm thick. The design of the prime and finish coaters will be based on the most recent iteration of Danieli Fata Hunter’s single-slide technology and integrated with dry-film thickness measurement sensors to provide a closed-loop control for higher coating repeatability and limited operator intervention. The galvanizing and color-coated strip produced in Crawfordsville with the new lines will serve markets for steel buildings.
Danieli Automation will provide advanced process control systems to supervise operations, running the lines in automatic mode, guaranteeing quality and production consistency. Startups are scheduled for the end of 2024 for the PLTCM and temper mill in West Virgina and also for the galvanizing and strip-processing lines in Crawfordsville.
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