I do not recall all the details, but when Haynes was in financial trouble about 8 years ago they had to decide how to survive and there was not enough prospective business in the Stellite alloy area for them to make it viable. Deloro acquired the alloy technology, licences etc., or maybe they already had them, or... a call to Deloro would probably provide the correct story.
Anyhow, this is the same familiar family of alloys used for valve seats and many other critical wear -resistant applications. They are nickel and cobalt alloys with very good elevated temperature properties too. Here's a paste in from the Deloro Stellite web site. (Unfortunately they don't want to say what happened to Haynes there either.)
Stellite 6 is the most generally useful cobalt alloy, having excellent resistance to many forms of mechanical and chemical degradation over a wide temperature range. Particular attributes are its outstanding self-mated anti-galling properties, which result in its wide use as a valve seat material, high temperature hardness, and a high resistance to cavitation erosion. The alloy is ideally suited to a variety of hardfacing processes.
