The company also said that "bottom of the cycle is behind us" and it is "cautiously optimistic" for 2014.
In the corresponding quarter of 2012, the world's largest steelmaker had posted an EBITDA (earnings before interest, tax, depreciation and amortisation) of USD 1.445 billion.
Marketmen were expecting an EBITDA or core profits of USD 1.549 billion for the July-September quarter.
"After a weak first half, we have seen third quarter performance improve year-on-year, positively impacted by our cost optimisation efforts and the increased shipments from our mining expansion," ArcelorMittal Chairman and CEO L N Mittal said in a statement on the results.
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He further said that "We believe that the bottom of the cycle is behind us and expect second half EBITDA, usually comparably weaker, to be at least equal to the first. Although operating conditions remain challenging, as economic indicators are improving we are cautiously optimistic about the prospects for 2014."
Besides, it is hopeful of posting better core profits (EBITDA) than the revised guidance of USD 6.5 billion for the whole of 2013.
During the last quarter, steel shipments of the company increased by 6 per cent to 21.1 million tonnes (MT), while iron ore sales were up 32 per cent at 0.4 MT. In terms of revenue, though, sales were lower by 0.4 per cent to USD 19.6 billion.
Net interest expense of the company also declined by over 14 per cent to USD 409 million from USD 479 million of third quarter of 2012.
It also reported cost savings of USD 800 million during the nine months of the year through its various management gains programmes.