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I can't access the companies web site to see what information is listed there but what I would expect with a steel with that much carbon in it is that you could run into a problem with retained austenite if it is heated too much. It also might take a bit of a soak at temperature to put the tungsten carbides into solution. A regulated high temperature oven would really be in order for this steel. It might also rate a sub-critical anneal to spherodize the carbides to improve machineability.
Does the data sheet say anything about the alloy being designed for high temperature tools. If it is I would say look for another steel to make knives from. I would also agree with Jim to temper at a higher temp and aim for an HrC of around 58.
Doug
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