In the Indian capital, Delhi rich ancient monuments, and among these mysterious monuments iron column not only raises the old hand that exceeds 1500 years, but also enjoy it as corrosion resistant as if applicable technology does not belong to existing technologies on the planet. Points and Head of the Department of Applied Human Sciences at the Indian Institute of Technology and Management, Mr. Gupta that this column, which is one of the main tourist attractions in Delhi rise up to about 7 meters, and has a 99.72 percent pure iron.
Currently purity wrought iron production rate of up to 99-99.8 percent, but the final product contains impurities sulfur, manganese, which are not in the old iron column. In addition, there is a layer of protective oxide on this column, which does not exist in the modern steel industry...