Metrode Supermet-2506CU description: These consumables are designed to match similar alloys, usually supplied as castings. The addition of copper improves corrosion resistance in sulphuric acid media and potentially increases strength and wear resistance, but as-welded toughness and pitting performance in chloride media are reduced in comparison to alloys with <1%Cu. Although the composition is controlled to ensure a minimum Pitting Resistance Equivalent (PRE) of 40 to match the superduplex alloys and maximise resistance to pitting consumables with <1%Cu may be preferred for non-sulphuric acid media unless PWHT is applied.