I had more than one supply pipe actually rot a hole in the side of it that leaked, and I had to replace it. I ended up replacing all the plumbing in the entire house being a overkill sort of guy, but the advice here is that the pipe, even though it starts out thick steel can get holes in it and must be replaced.

I don't like Galv. pipe as one 18" long section of supply pipe was so corroded you could no longer see through it. It was pretty gross.

Dirk