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Holding for five minutes at 1220°C followed by air cooling.
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Ivanov, A.G., Kruchinina, Y.B. Treatment ups hardness of high-speed steel. Met Sci Heat Treat 4, 220 (1962). https://doi.org/10.1007/BF00819280
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DOI: https://doi.org/10.1007/BF00819280