it will depend on the way it was made (hard drawn or anealed etc..) and the wall thickness.
The schedule is the pressure the pipe is rated to. so water pipes would be lower schedule than say gas pipes (oxygen etc) in a hospital..
What did the neighbour do with them? find that out and that will lead to you to more answers than in the replies you will get here (regarding grade and shedule etc...)
best of luck, and nice haul!!
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