Hydrogen is a problem in most steels because it is highly mobile in atomic form and can both diffuse through and be transported by the movements of dislocations
There's no such thing as 2 7/8" drill pipe. There's 2 7/8" EUE tubing, which is production tubing and not designed to drill. H2S embrittles steel. if it was exposed to H2S, it's scrap metal, trust me on that one.