common metal or metal alloy, particularly steel and steel alloy, more particulary steel and steel alloy suitable for enamelling and sheet steel or strip-steel suitable for enamelling and sheet steel alloy or strip-steel alloy suitable for enamelling

common metal or metal alloy, particularly steel and steel alloy, more particularly steel and steel alloy suitable for enamelling and sheet steel or strip-steel suitable for enamlling and sheet steel steel alloy or strip-steel alloy suitable for enamelling