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How is much amount of chromium (in percent) normally added in steel to be called as stainless steel?

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How is much amount of chromium (in percent) normally added in steel to be called as stainless steel?

(a) 1-2 %

(b) 2-5 %

(c) 5-10%

(d) 10-30 %

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Asked question is from Melting of Steel and Stainless Steel in section Foundry Introduction & Materials of Casting-Forming-Welding II

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Right answer is (d) 10-30 %

Best explanation: Stainless steels mainly contain 10-30 % of chromium besides other elements such as carbon, manganese, silicon, sulphur etc. Chromium produces corrosion resistance property in steel, that’s why the material is known as stainless steel as no any kind of stains are occur on the surface of the steel.

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