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Which material of construction is used in reactor steels(hydrogenation of coal) to avoid hydrogen embrittlement?

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Which material of construction is used in reactor steels(hydrogenation of coal) to avoid hydrogen embrittlement?

(a) Tool steel

(b) Chromium-molybdenum steel

(c) Stainless steel

(d) Carbon steel

I have been asked this question by my college director while I was bunking the class.

This intriguing question originated from Natural Products in chapter Natural Products of Chemical Technology

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Right choice is (b) Chromium-molybdenum steel

To explain: Chromium-molybdenum steels are used as material of construction in reactor steels to avoid hydrogen embrittlement. Coal must be fed in powdered form into the hydrogenators reactor.

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