In Fe415 & Fe500,What is mean by "Fe" and "415/500"?

Answer Posted / dhrubajyoti dam

fe 415 & fe 500 is yield strees of deformed bar...i.e 415n/mm2 & 500n/mm2
i.e if 415n & 500n force are applied per mm area then the bar is going back to its original position...

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