Red Seal Trades › Tool and Die Maker (430A) › Heat Treatment
Heat Treatment makes up about 13% of the 430A Tool and Die Maker Red Seal exam. Below are 5 free practice questions from this block, each with the answer and a plain-English explanation of why it is right.
Practice all 13 Heat Treatment questions →1.Hardening of tool steel involves heating to the critical temperature and then:
Why: Heating above critical temperature austenizes the steel. Rapid quenching traps carbon in a martensitic structure = hard. Quench medium depends on steel type: O-series=oil, A-series=air, W-series=water.
2.D2 tool steel is classified as:
Why: D2 is high-carbon, high-chromium (12%) cold work die steel. Air-hardening with excellent wear resistance. Widely used for blanking dies, forming dies, and punches.
3.Stress relieving is performed at what temperature range?
Why: Stress relieving heats below the critical temperature to relax internal stresses from machining, welding, or forming WITHOUT changing the hardness or microstructure.
4.Case hardening (carburizing) produces:
Why: Carburizing adds carbon to the surface layer at high temperature. After quenching, the carbon-enriched case is hard (wear-resistant) while the low-carbon core remains tough (shock-resistant).
5.Rockwell C hardness testing uses what indenter and load?
Why: Rockwell C: diamond cone indenter (brale), 10 kgf minor load + 150 kgf major load. Used for hardened steels (20-68 HRC). Rockwell B uses a ball indenter for softer materials.
8 more Heat Treatment questions inside
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