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Try the book: "Atlas of Stress-Strain Curves". You may find it in libraries (or through inter leibrary loans) for free.
The book mentioned by Zhi Lu is online (except for the section on tool steels) and is at least a start.
whoever is going to sell you the material to make your product.
materiality as part of sim pro has some as well
and i've had good luck with connecting with my old university library and also talking to the material specialists out there