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What is the amount of sea coal needed in cast irons for large green casting moulding sands?(a) 10%(b) 15%(c) 20%(d) 25%I had been asked this question in unit test.My question is based upon Bonding Theory in chapter Molding and Core Sands of Casting-Forming-Welding I

Answer»

Right option is (a) 10%

Explanation: Sea COAL otherwise is used in SMALL numbers for binding. Sea coal is used for surface APPEARANCE IMPROVEMENT. It is used about 10% in cast iron moulding sands for large green casting sands.



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