- Overheating.
- Burning.
- Quenching cracks.
- Warping*.
- Decarburisation.
- Corrosion.
- Excessive hardness of hot worked annealed steel.
- Insufficient hardness after quenching.
- Excessive hardness after tempering.
- Insufficient hardness after tempering.
*warping means become bent or twisted, out of shape
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