an auditor in his report mention the cost of railway department is expensive which property of iron made cost high
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Answer:
it's hardness
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The property of iron which made it cost high is it's high tensile strength and that with right composition, it can form an alloy, steel.
Iron is used to make steel which has better tensile strength and hardness. Steel does not bend easily and is resistant to cracking due to heavy loads of trains. Also, steel does not rust as easily as iron.
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