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Which of the following materials is required in a technique of decarburizing the molten steel?

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Which of the following materials is required in a technique of decarburizing the molten steel?

(a) Calcium carbonate

(b) Sodium chloride

(c) Carbon ferrochrome

(d) Sodium ferrochrome

This question was posed to me during a job interview.

Query is from Melting of Steel and Stainless Steel in portion Foundry Introduction & Materials of Casting-Forming-Welding II

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The correct choice is (c) Carbon ferrochrome

The explanation: Decarburization technology uses high carbon ferrochrome to decarburize the molten steel at lower temperatures. If carbon oxidizes first with respect to chromium at low temperatures, then the reduction in pressure from atmosphere to a lower value will be required. Reduction in pressure is mostly done by vacuum oxygen decarburization (VOD) method.

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