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Gas carburizing differs from pack carburizing due to the use of ________

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Gas carburizing differs from pack carburizing due to the use of ________

(a) Silicon-providing gas

(b) Mercury-providing gas

(c) Carbon-providing gas

(d) Argon

The question was asked in homework.

I would like to ask this question from Carburizing topic in section Heat Treatment of Engineering Material & Metallurgy

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The correct option is (c) Carbon-providing gas

The best explanation: Gas carburizing overcomes the drawbacks of pack carburizing by replacing the solid carburizing mixture with a carbon-providing gas. In general, natural gas, propane, or generated gas atmospheres are used in these cases.

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