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What is meant by caustic embrittlement of steel?

What is meant by caustic embrittlement of steel? Correct Answer Failure of cold-worked rivets by a brittle fracture in the presence of caustic soda

Explosions of riveted boilers that occurred in early steam-driven locomotives are due to the cold working during the operation. Hence, brittle fracture in the presence of caustic resulted in caustic embrittlement.

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