Wiki- Molybdenum

Molybdenum is used to make V1 to V10. (It is originally contained in V1 as well.) Adding a small amount makes it more tenacious. It also increases strength and hardness. Molybdenum steel is often referred to as molybdenum steel, but molybdenum steel is a general term for steel materials that contain molybdenum. It is not the name of a specific steel material, such as white steel, but a steel material that contains molybdenum is widely referred to as "molybdenum steel.

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