Perhaps similar to X45NiCrMo4 for many applications.
Seems to need cryogenic treatment for best properties possibly the high Si
at work?

wrote in message
...
Carpenter Tech announced a patented high strength steel that does not
contain Cobalt.
In fact reading the data sheet, it is a low alloy steel with high
strength and toughness.

http://finance.yahoo.com/news/PremoM....html?x=0&.v=1


Dan