A category of rare metals, typically tungsten, molybdenum, niobium, tantalum, vanadium, zirconium, etc., with high melting points, high hardness, and strong corrosion resistance. Tungsten and molybdenum are commonly used in alloy steel, heat-resistant alloys, and cemented carbide; tungsten is also commonly used as a filament material. Vanadium is commonly used in alloy steel formulations. Niobium and tantalum.
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