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I checked those steels, A515 is a medium carbon steel (.3% carbon) with a coarse grain structure. It would not be suitable for a blade in any way. I couldn't find anything definitive on the #60 steel. If I were to guess those blades were 1060-1090 carbon steel. They could be a cheap stainless. I haven't used one in years to remember if they rust. If they are stainless then just switching to carbon steel would be a plus.
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