It is my understanding that bbl steel was bbl steel. As an example, 4140 is the prefered steel for bbl's today. If two different Co's. use the same steel to bore for bbl's, wherein lies the difference ? Perhaps there may be some difference in heat treating to bring the steel to its best toughness. That being, wouldn't all the different bbl makers use the same method ? I personally don't see the difference --- maybe it was a gimmick to raise the value/cost of these bbl's. ????? Ken
When you buy a melt (50 tons) Mr. Ken you can specify to what degree you want to hold the ingredients and to what degree you wish to hold the tramp elements. The cleaner and purer the more the melt costs. This is why for the sake of difference not all 4140 is created equal. The nasties show up as blemishes in highly finished metal, as I'm sure you've noticed in your many years of metal working.
