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(D) Railway wagon axles are made by heating rods of iron embedded in charcoal powder. The process is known as case hardening.Case hardening is the pro

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case hardening

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(D) Railway wagon axles are made by heating rods of iron embedded in charcoal powder. The process is known as case hardening.Case hardening is the process of hardening the surface of wrought iron or low-carbon steel by diffusing carbon into the surface layer to form a thin layer of high-carbon steel.This is typically achieved by heating the iron in contact with carbonaceous materials like charcoal or potassium ferrocyanide,followed by quenching in a suitable medium like oil or water.

Axles are made by heating rods of iron embedded in charcoal powder. The process is known as

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