Was Andrew Carnegie the first to mass produce steel?

No, Andrew Carnegie was not the first to mass produce steel. The mass production of steel began earlier with the introduction of the Bessemer process in the 1850s, which allowed for the efficient production of steel from molten pig iron. However, Carnegie played a crucial role in the steel industry by refining production techniques and significantly increasing output, making his Carnegie Steel Company one of the largest and most successful steel producers in the United States.