Common metals and their alloys; metal hardware, namely, metal well bore and borehole liners and casings, elbows of metal for flexible pipes, elbows of metal for rigid pipes, reducers, and metal fittings for pipes; metal pipes and tubes with a wear protection layer; metal ducts provided with a wear protection layer for conveying solids, liquids and gases; metal composite tubes and pipes; metals and metal alloys with highly wear-resistant coating for mounting in wear affected machines or facili...