▁ 1 1 1 7 . ▁During ▁World ▁War ▁II , ▁the ▁works ▁suffered ▁a ▁certain ▁amount ▁of ▁damage . ▁ ▁Commun ist ▁era ▁In ▁ 1 9 4 8 , ▁the ▁new ▁Commun ist ▁regime ▁national ized ▁the ▁works , ▁and ▁the ▁existing ▁factory ▁was ▁expanded ▁into ▁a ▁steel - man ufact uring ▁complex . ▁In ▁ 1 9 5 3 , ▁two ▁semi - c oking ▁batter ies ▁started ▁to ▁be ▁built . ▁These ▁became ▁oper ational ▁in ▁ 1 9 5 6 ▁and ▁ 1 9 5 7 ▁respectively , ▁but ▁were ▁soon ▁shut ▁down ▁due ▁to ▁lack ▁of ▁product ivity . ▁ 1 9 5 7 ▁saw ▁the ▁introduction ▁of ▁the ▁first ▁car bur izing ▁o ven , ▁used ▁to ▁manufact ure ▁semi - co ke ▁by ▁fluid ization . ▁Both ▁of ▁the ▁old ▁furn aces ▁were ▁re built : ▁the ▁second , ▁with ▁a ▁capacity ▁of ▁▁ 2 5 0 ▁m 3 , ▁entered ▁production ▁in ▁ 1 9 5 2 . ▁The ▁first , ▁with ▁a ▁similar ▁capacity , ▁was ▁ready ▁in ▁ 1 9 5 9 . ▁The ▁furn aces ▁re lied ▁on ▁co ke ▁and ▁m eth ane ▁gas ▁for ▁comb ust ible ▁material . ▁In ▁ 1 9 5 8 , ▁building ▁started ▁on ▁a ▁new ▁found ry ▁that ▁was ▁able ▁to ▁turn ▁out ▁ 4 0 , 0 0 0 ▁tons ▁of ▁ing ots ▁and ▁parts ▁ann ually . ▁A ▁new ▁work shop ▁was ▁inaugur ated ▁in ▁ 1 9 6 4 ,