City Guilds Model Questions Vol1 2021 Engineering Question 13
Practice objective / multiple choice question 13 from the 2021 City Guilds Model Questions Vol1 Engineering examination.
A 1045 carbon‑steel component is to be hardened. The Ac3 temperature for a carbon steel can be approximated by \(Ac3 = 910 - 203C\) (°C), where \(C\) is the carbon fraction. For 1045 steel, \(C = 0.45\%\). (a) Calculate the Ac3 temperature. (b) The austenitising temperature must be at least \(30^{\circ}\)C above Ac3. Determine the minimum austenitising temperature. (c) The austenitising holding time \(t\) (minutes) is given by \(t = 0.02 D^{1.5}\), where \(D\) is the largest section thickness in mm. If the component's maximum thickness is \(40\) mm, compute the required holding time (to one decimal place).
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About This Question
This is City Guilds Model Questions Vol1 2021 Engineering Question 13. It is one of the objective questions from the 2021 City Guilds Model Questions Vol1 Engineering examination.
Difficulty level: Hard .
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