Quoted from Ron Andersen on 08/12/01
I'll pop in for our company. AUS steels are of Japanese origin, while 440 steels are U.S. made. SOG's knives are (for the most part) made in Seki, Japan. So, our knives have been AUS steels all along.
Why, then, would we label any as 440? It was a marketing decision. When we started doing it more than a decade ago, the thought was that consumers in the American marketplace might know and understand 440 labels better than the AUS labels. As a result, the "similar" 440 labels for the actual AUS steels were used. This may or may not have been the best decision. Maybe someone with more historical perspective than me can answer this better, but I think the AUS steels have more recently gained broader understanding. As a result, we are converting completely to AUS labeling for all our knives in marketing material. I do understand that there are technical differences between the 440 and AUS steels. The key word here is "similar."
In "SOG-speak," AUS6A and 440A were interchanged, while AUS8A and 440C were interchanged. Are these the most accurate comparisons? I'm sure there will be those with differing opinions....