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 heat treatment process applied to steel that relieves strains and brittleness, which can improve the material's ductility that may have been induced during the hardening process.
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 formed during the working of the metal.
To soften steel to facilitate the machining process.
To refine the grain structure and reduce brittleness.
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 or upper critical temperature during the normalising process.
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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