Multiple choice general knowledge science & technology

What is the maximum carbon percentage in a steel?

  1. 0.2%

  2. 2%

  3. 6%

  4. 20%
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Steel is defined as an alloy of iron and carbon with carbon content typically between 0.02% and 2% by weight. The 2% upper limit is a critical distinguishing factor between steel and cast iron (which has higher carbon content, typically 2-4%). Beyond 2% carbon, the material is classified as cast iron, not steel. Options A (0.2%) is too low for most steels, C (6%) and D (20%) are in the cast iron range.

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