Annealed cast iron is a chill casting made from iron containing 2.4 to 3% carbon, which is annealed (tempered) for up to several days at temperatures above 900 °C. This comes in the form of white and black annealed cast iron. White annealed cast iron is decarburised annealed cast iron with the following composition:
- 3 to 3.2% C
- 0.75 to 0.55% Si
- max. 0.20% S
- max. 0.10% P
- Mn=1.7x% S
Black annealed cast iron is non-decarburised annealed cast iron with the following composition:
- 2.40 to 2.60% C
- 1.40 to 1.20% Si
- max. 0.15% S
- max. 0.10% P
- Mn= 1.7x% S