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What is the amount of sea coal needed in cast irons for small casting moulding sands?

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in Casting-Forming-Welding I by (687k points)
What is the amount of sea coal needed in cast irons for small casting moulding sands?

(a) 1%

(b) 2%

(c) 3%

(d) 4%

I got this question in unit test.

Query is from Bonding Theory in portion Molding and Core Sands of Casting-Forming-Welding I

1 Answer

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Best answer
The correct answer is (a) 1%

Easiest explanation: In bonding of substances, an extremely small quantity of sea coal is also needed. Sea coal is used for surface appearance improvement. It is used about 1% in cast iron moulding sands for small castings.

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