molten metal cascades from iron ladles into extensive round moulds, illuminating the hot-rolling shop with fiery sparks

steel casting molten metal iron ladle hot rolling shop round moulds sparks industrial process pouring foundry manufacturing ironworks smelting heavy industry machinery high temperature workshop fabrication furnace artisanship craftsmanship workers production line steelmaking metalworking construction equipment safety gear cooling alloy metallurgical engineering technology labor flying operation material cascades ladles extensive illuminating hot-rolling fiery