The company headquarters were located in the
Carnegie Building, an
early skyscraper in
Downtown Pittsburgh. Built to show its use of steel in its construction, the building was fifteen stories high and was left uncovered for a full year. The Carnegie Building was demolished in 1952. Carnegie Steel made major technological innovations in the 1880s, especially the installation of the
open hearth furnace system at
Homestead in 1886. It now became possible to make steel suitable for structural beams and, with the advanced work of
George Lauder in arms and armament, for armor plate for the US Navy and the militaries of other governments, which paid far higher prices for the premium product. In addition, the plant moved increasingly toward the continuous system of production. Carnegie installed vastly improved systems of material-handling, like
overhead cranes, hoists,
charging machines, and
buggies. All of this greatly sped the process of steelmaking and allowed the production of far vaster quantities of steel. As the mills expanded, the labor force grew rapidly, especially less skilled workers. The more skilled union members reacted with the unsuccessful 1892
Homestead Strike along with demands for reduced working hours and against pay cuts. After the unsuccessful strike the company continued to expand and profits grew year on year, with the company having earned net profits of $21 million in 1899.
J&L Steel was the most important competitor to the Carnegie Steel Company (and later to
U.S. Steel) in the vicinity of
Pittsburgh. ==Sale==