You can go to any office of BUREAU OF INDIAN STANDARDS spec from there. If you are
located in Mumbai, the BSI office is in Novelty Chambers [Novelty Theatre Building] at
Grant Road which is hardly a 5 - 10 minute walking distance from Grant Road Railway
Station.
I do hope this will help.
The indian standard confirms to dimensional tolerence and not chemical composition. IS 3739 : 1987 - Dimensional tolerances for carbon and alloy constructional steel products