So, if all the components that I use for making the board (including the board itself) comply with the industry standards then its almost certain that my board is considered to be of Industrial Grade.

No, you can't. Most of the industrial PCB I have seen, are:

1) on FR-4 Sheet
2) Industrial or Mil grade components
3) Lacquer coated after assembly
4) Teflon wiring (if any)