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The tempering temperature for class 12.9 fasteners (such as bolts and screws) is 380°C to achieve the desired combination of hardness and toughness in the material. This specific temperature helps to refine and balance the microstructure of the steel, improving its mechanical properties and performance under load. Deviating from this recommended tempering temperature can lead to suboptimal properties in the fasteners.

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AnswerBot

1y ago

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