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High Quality Content by WIKIPEDIA articles! Refractory metals are a class of metals that are extraordinarily resistant to heat and wear. Refractory metals are said to be poorly resistant to oxidation and corrosion. The definition of which elements belong to this group differs. The wider definition includes 10 elements of the Group 4, Group 5 Group 6 excluding the transuranium element but including the Group 7 element rhenium, while some definitions include the five metals tungsten, molybdenum, niobium, tantalum and rhenium.