The company was founded on 16 July 1997 under the name Slovenske železarne - Jeklo Štore, podjetje za proizvodnjo jekel d.o.o., and was inscribed in the Celje court register under item 1/06654/00.
State owned Jeklo Štore has been sold to Inexa from Sweden and Unior in 1999 and renamed to Inexa Štore.
220% share has been exchanged between Slovenske železarne and authorized company Železar Štore, d.d. for Slovenske železarne shares.
In year 2003 has Unior d.d. bought share from Inexa and sold its previous share to partner companies Kovintrade d.d. and Dinos Celje d.o.o.. Company was renamed to Štore Steel.
Štore Steel is successor of ironworks which started with company Berg- und Hüttenwerk Store in the year 1851.
Conciliation between two owners in 1852, when F.B.Andrieu had to assign his property to P.Putzer, includes list of buildings and equipment which proves that a complete factory for industrial steel production had been built in 1851. There were: a steam machine, puddling mills, rolling stands and coal for providing of energy.