VIENNA (Reuters) - Austrian steelmaker Voestalpine said on Monday its natural gas supply is secure even if Russia's Gazprom stops deliveries to Austria altogether.

Gazprom on Saturday halted supplies to Austrian energy company OMV after OMV won an arbitration case against Gazprom awarding it more than 230 million euros ($244 million) in damages and said it would recover that money by not paying Gazprom's invoices.

Gazprom's shipments to Austria via pipeline through Ukraine and Slovakia have continued, however. Flows into Austria are down by less than a fifth.

"We have received assurances from our suppliers that we will receive the contractually agreed gas volumes even in the event of a possible interruption in supply from Gazprom Export," Voestalpine said in a statement in response to a Reuters question about security of supply.

Voestalpine is one of Austria's biggest consumers of gas as steelmaking is energy-intensive.

"In addition, Voestalpine obtains gas directly from various international sources and can also make use of the natural gas storage facility built in 2022, which alone will cover our current requirements in full for at least 3-4 months," it added, referring to its own reserves.

Austria has long been heavily reliant on Russian gas. The country pledged to kick that habit soon after Russia's full-scale invasion of Ukraine in 2022. It says it is now prepared for an end to Russian gas supplies, with large gas storage facilities that are 93% full and other sources able to fill any supply gap.

At the same time, it continues to obtain most of its gas from Russia. In September, the latest month for which data is available, 86% of imports came from Russia, according to the government's energy portal.

($1 = 0.9433 euro)

(Reporting by Alexandra Schwarz-Goerlich; Writing by Francois Murphy; Editing by Marguerita Choy)