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 to relieve strains and brittleness induced during the hardening process. It enhances the ductility of the steel, making it less brittle and improving its toughness.
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 the working of the metal.
To soften steel in order to facilitate the machining process.
To refine the grain structure and reduce brittleness, ultimately improving ductility.
Step 3
At what approximate temperature is steel heated during the normalising process?
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Answer
Steel is typically heated to a temperature above the upper critical temperature, which is generally around 800–900°C.
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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