Who is known as steel king?

The title "Steel King" is often associated with Andrew Carnegie, a prominent industrialist in the late 19th and early 20th centuries who played a significant role in the expansion of the American steel industry. Carnegie founded the Carnegie Steel Company, which became one of the largest and most profitable steel companies in the world, ultimately leading to his reputation as a titan of the steel industry. His innovations in production and business practices contributed to the growth of the steel industry in the United States.