Red Seal Welding Practice Exam

What carbon range does medium carbon steel have?

1. 0.05-0.3% carbon

2. 0.3-0.45% carbon

3. 0.45-0.6% carbon

4. 0.6-0.75% carbon

The correct answer is: 0.3-0.45% carbon

Medium carbon steel typically contains 0.3-0.45% carbon. This is considered to be a higher amount of carbon than low or mild carbon steel, but lower than high carbon steel. Option A (0.05-0.3% carbon) is incorrect because that carbon range falls under low or mild carbon steel. Option C (0.45-0.6% carbon) is incorrect because that carbon range is considered to be high carbon steel. Option D (0.6-0.75% carbon) is also incorrect as that is a range for very high carbon steel. Overall, medium carbon steel falls in between low/mild and high carbon steel in terms of carbon content.