even iron gets rusted,we are using for building constructions as a traditional metal.is it correct if not suggest alternate metals
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Iron and steel

by Chris Woodford. Last updated: August 12, 2018.
Think of the greatest structures of the 19th century—the Eiffel Tower, the Capitol, the Statue of Liberty—and you'll be thinking of iron. The fourth most common element in Earth's crust, iron has been in widespread use now for about 6000 years. Hugely versatile, and one of the strongest and cheapestmetals, it became an important
It's an important question in today's scenario.
As amount of iron in earth's crust is much larger than many of the elements in the periodic table, it's much lesser cost than some other better metals etc factors always lead us to use iron till now. But the greatest drawback is the rusting.
Go get rid of this problem various ways are invented like 1) Other metals like aluminium, tungsten etc are being used in small scale industries or in production of crucial constructions(machinery); 2) Stainless steel is till the best replacement of iron; 3) Alloys are being used in big scale constructions instead of raw iron. Various alloys have different properties thus opening a huge possibility in choice in different works; 4) If raw iron is being used it's generally coated with some coating material(may be another metal) [just like galvanisation : zinc is the coating material here].