Tungsten and Vanadium are important metals. When added to steel, they make it hard. Such steel alloys are used for making:
A
high-speed tools
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B
forging presses
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C
diamond safes
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D
ball bearings
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Solution
The correct option is A high-speed tools Many minor metals, including chromium, tungsten, molybdenum,titanium, niobium, tantalum and zirconium, form strong carbides that—in steel—increase hardness and strength. Such steels are often used to make high-speed steel and hot work tool steel.