Definition: Aluminium Killed Steel that has been "quieted" by adding aluminium to remove trapped oxygen.
The Problem: Dissolved oxygen creates gas bubbles (blowholes) during cooling.
The Solution: Aluminium reacts with oxygen (2Al + 3O => Al2O3) to stop the bubbling.
Benefits:
- Uniformity: No bubbles means a consistent metal structure.
- Toughness: Creates a fine grain structure that makes the steel stronger.
- Shaping: It is the "gold standard" for pipes that need to be bent or stretched (deep drawing).