3.1 Define tempering of steel - NSC Mechanical Technology Fitting and Machining - Question 3 - 2022 - Paper 1
Question 3
3.1 Define tempering of steel.
3.2 Give THREE reasons why the annealing process is conducted on steel.
3.3 At what approximate temperature is steel heated during t... show full transcript
Worked Solution & Example Answer:3.1 Define tempering of steel - NSC Mechanical Technology Fitting and Machining - Question 3 - 2022 - Paper 1
Step 1
Define tempering of steel.
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Answer
Tempering is a process generally applied to steel to relieve the strains, brittleness, and improve ductility induced during the hardening process. This helps in enhancing the material properties by reducing internal stresses.
Step 2
Give THREE reasons why the annealing process is conducted on steel.
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Answer
To relieve internal stresses that may have been set up during working of the metal.
To soften steel in order to facilitate the machining process.
To refine their grain structure to improve mechanical properties.
Step 3
At what approximate temperature is steel heated during the normalising process?
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Answer
Steel is typically heated above the higher/upper critical temperature, which is generally around 800°C to 900°C, based on the specific type of steel.
Step 4
Identify the type of steel/iron from the spark patterns shown in FIGURES 3.4.1–3.4.3 below.
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