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Which of the following can be used for hard coating applications?

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Which of the following can be used for hard coating applications?

(a) High-chromium stainless steel

(b) Heat-treated stainless steel

(c) Hardened brass

(d) Aluminum

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This interesting question is from Metal Spraying and Hard Facing, Age Hardening in portion Wear of Metals, Mechanical Properties and Testing of Engineering Material & Metallurgy

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Correct choice is (a) High-chromium stainless steel

For explanation: High-chromium (13.5%) stainless steel can usually be used in applications where a hard coating is required, even where corrosion resistance is not necessary. The material has high strength and elongation, low shrinkage, and little tendency to crack on shafts. Typical applications include armature shafts, cylinder liners, hydraulic rams etc.

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