I know this. And this is exactly what I am talking about. Bought a 20' section of 316L Schedule 40 pipe from Englund Supply a few years back. Did not realize it was actually Schedule 80 pipe
until I went to use it. Well, like you say, the ID is too small. for some uses but it does meet specs for pipe as the pressure requied for Schedule 40. This is exactly what happened.
No way can you change the Chromium content, but they did it for the PSI, 80 to 40. It did not work for me because of weight and ID.
But that is the sort of shinaigans that happens with some of the imports where the supplier is not watching. I am surprised I hauled it all the way to my shop before I discovered the mismatch.
Can't remember, but I suppose I let them load it on my trailer, and I dumped it off. I think it was nearly a month later that I noticed what I had. When we chased it down as to what actually happened, their invoice on their order does not say SCH40 pipe, it says 314L pipe meets schedule 40 specs. Schedule 40 specs is non specific on ID, only specific on PSI. So Englunds was duped and passed it on to me. As you know, only the OD is consistant with pipe, regardless of the Schedule 10,20,40, or 80.
"MArzy, hit me up if you have questions about suppliers."
Thanks, it might happen. You never know what is next.