The plant in Smederevo produces iron at two blast furnaces then converts blast furnace iron to raw steel at a three-furnace converter shop and continuous casting complex. Steel is further processed in the Hot Strip Mill and Cold Rolling Mill units.

The Smederevo plant's design capacity is 2.2 million metric tons per year. The plant's operations have never reached this level. Through numerous investment campaigns, various units were rebuilt and revamped in order to reach the designed production level. These campaigns included rebuilding the plant's No. 1 blast furnace, idle since 1987; modifications in the steel producing shop aimed at increasing steel furnace output by 20-percent and the modernization of two continuous casting machines, equipping them with variable width molds to enhance productivity and product quality.

Record output of 1.703.383 tons of steel was recorded in 2006.
In December 2004, the plant completed a $10.5 million upgrade of its cold reduction sheet mill installing a new automation system that eliminates a long obsolete electrical control system. Electronic problems had restricted the making of value added products for many years. The upgrade allowed an increase of more than 140,000 tons of cold reduced sheet products annually - mostly for export.
Blast Furnace #1 was modernized and restarted on June 22, 2005 after being idle for 18 years. The ceremony was attended by top corporate management and high officials of the Republic of Serbia.
In early November 2005, a new facility for waste water treatment was launched, and this investment meets all environmental requirements.

In May 2006, a modernized converter #1 was started up at the Steel Shop, which significantly increased the facility’s production capacity.

In December 2007, the modernization of Blast Furnace #2 was successfully completed, which is one of the two blast furnaces for hot metal production. The purpose of modernization was to extend the operating life for at least 15 years. The value of this investment was around 40 million USD.

On January 31, 2008, Serbian Ministry of Environmental and 
company have signed an agreement on U.S. Steel Serbia's investments into environmental projects. Under the terms of the agreement, company is obliged to invest USD 50 million into environmental projects by the end of 2009. At the same time, Ministry of Environmental obliged to assist in realizing these environmental projects. The main projects agreed to be done were reconstruction of the main stack in the Sinter Plant and projects for reduction of fugitive emissions from the Steel Shop roof and Steel Shop stack, as well as an installation of a BOP filter press. At the end, over 60 million USD was invested into these projects.

Proving that investing in environmental protection is one of the company's key values, in 2010, in an agreement with the Ministry of Environment, the company financed the modernization of two automatic environmental measuring stations located in the local communities of Radinac and Ralja.  
The investments in Smederevo steelworks do not stop here. Continual investing in improving the production process, workplace safety and protecting the environment are preconditions for fulfilling the Company’s greatest values.