The zinc die-casting industry has the same problem with their transfer pots. I've seen a thin ceramic wash used on steel pots to reduce the problem but as the ceramic wears away with time the pots have to be recoated or they crack
DSR
400 series alloys are subject to in-service embrittlement at high temperatures so be sure that your application is suitable and won't degrade the properties before you spend too much time looking for 409 pipe
