In steel forging production, heat treatment plays a critical role in determining strength, toughness, and service life. The most common heat treatment methods include normalizing, tempering, and quenching & tempering (Q&T).
1. Normalizing
Normalizing involves heating the steel above its critical temperature and cooling it in air. It is mainly used to:
- Refine grain structure
- Improve internal uniformity
- Enhance mechanical properties
- Improve machinability
Normalizing is widely applied to forged wheels, forged shafts, and structural components with medium strength requirements.
2. Tempering
Tempering is usually performed after quenching. It helps to:
- Reduce internal stress
- Improve toughness
- Adjust hardness
Tempering alone is less common and typically combined with quenching.
3. Quenching & Tempering (Q&T)
Q&T is a combination of quenching and tempering and is commonly used for high-strength forged components.
Advantages:
- High strength
- Good toughness
- Stable microstructure
- Suitable for heavy-duty applications
It is widely used for crane wheels, heavy forged shafts, and wind power forgings.
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