Correct Answer - Option 3 :
0.6 – 0.8%
Steel is an alloy of iron and carbon, along with small amounts of other alloying elements or residual elements as well. The plain iron-carbon alloys (Steel) contain 0.002 - 2.1% by weight carbon. For most of the materials, it varies from 0.1-1.5%.
There are 3 types of plain carbon steel:
(i) Low-carbon steels: Carbon content in the range of < 0.3%
(ii) Medium carbon steels: Carbon content in the range of 0.3 – 0.6%.
(iii) High-carbon steels: Carbon content in the range of 0.6 – 0.8%.
Hence the carbon content (%) in high tensile steel is 0.6 – 0.8%.