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| Q. |
Steel contains – |
| A. | 0.1 - 2% carbon |
| B. | 5 - 10% carbon |
| C. | more than 10% carbon |
| D. | no carbon |
| Answer» A. 0.1 - 2% carbon | |
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Explanation: Steel is an alloy made by combining iron and other elements, the most common of these being carbon. When carbon is used, its content in the steel is between 0.2% and 2.1% by weight, depending on the grade. Other alloying elements sometimes used are manganese, chromium, vanadium and tungsten. Carbon and other elements act as a hardening agent, preventing dislocations in the iron atom crystal lattice from sliding past one another. |
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