Yup, that was a ten-year substitute for cast iron sewer pipes, during WWII, when iron/steel was needed for the war effort. And kudos, most people have never heard of it, I have, but have never seen one in inventory (used ones have long since been replaced).
I didn’t know that and it makes sense that they would use it during the war effort. Years ago, we had the waste line from our house to our septic tank replaced and it was cobbled together with clay tile, cast iron and orangeburg. Septic guy was an old timer & he knew what it was.