Medium carbon steel contains a carbon fraction measuring approximately__________________?
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Answer: B. 0.35 to 0.5
Explanation
Medium carbon steels are specifically formulated to bridge the gap between soft low-carbon and hard high-carbon alloys. Their chemical composition typically features carbon mass fractions ranging from approximately 0.30 to 0.50 percent. This balanced composition allows them to achieve high tensile strength through proper heat treatment. Carbon steels are classified based on carbon content into low, medium, and high carbon categories. Medium carbon steels can be quenched and tempered to improve toughness and fatigue resistance. Microstructures of these alloys typically consist of pearlite and ferrite phases after slow cooling.
Machinery components such as shafts, gears, and axles are commonly fabricated from medium carbon steel. Welding medium carbon steel requires preheating to prevent cracking caused by martensite formation. Structural engineering relies on these balanced alloys for applications requiring moderate strength and ductility. Carbon fractions between 0.1 and 0.35 represent low carbon or mild steels with higher formability. Carbon fractions between 0.8 and 1.4 represent high carbon tool steels used for cutting edges. Fractions exceeding 1.0 percent describe hyper-eutectoid tool steels possessing extreme wear resistance.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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