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Gun-metal should not be utilized in temperatures above __________

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Gun-metal should not be utilized in temperatures above __________

(a) 260°C

(b) 550°C

(c) 260°F

(d) 150°F

This question was posed to me in an international level competition.

My query is from Properties of Copper and its Alloys-2 topic in section Copper and its Alloys of Aerospace Materials & Processes

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Correct answer is (a) 260°C

Best explanation: Gun-metal is an alloy metal that cannot be used at all temperatures. More specifically, gun-metal should not be utilized in temperatures above 260°C. For certain components, it cannot be annealed as well.

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