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A large shape of a riser is mainly used for the casting of grey cast iron.

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in Casting-Forming-Welding I by (687k points)
A large shape of a riser is mainly used for the casting of grey cast iron.

(a) True

(b) False

The question was asked in exam.

The origin of the question is Rate of Solidification in chapter Cooling and Solidification of Casting-Forming-Welding I

1 Answer

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by (828k points)
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Best answer
Right choice is (b) False

The best I can explain: Grey cast iron is an interesting exception where solidification occurs in two stages. The shrinkage associated with the first stage can be compensated by the expansion of the casting due to the presence of graphite flakes in the material. Due to this, there is no use of riser in the casting system.

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