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Workshop Calculation and Science Practice Test: Heat Treatment
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Workshop Calculation and Science Practice Test: Heat Treatment
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25 Questions

1. What is the name of the heat treatment process, where the metal is heated and quenched In water or oil?
2. The hardness of steel depend open-
3. Which is a kind of surface hardening process?
4. What is the purpose of tempering a steel?
5. How much time is allowed normally in soaking zone for a 10mm thick metal piece while hardening?
6. The lower critical temperature of high carbon steel is-
7. Case hardening normally done for the steel that contain –
8. Sometimes, the case-hardened components are heated again at a temperature of 200° C. The possible reason behind this are-
9. In order to remove excessive brittleness, chisel is processed with the method called-
10. Tempering is done in order to-
11. Which process steel is heated in a carbonaceous atmosphere for the penetration of carbon?
12. Which methods are used under the process of heat treatment?
13. When carbon steel is heated above high critical point and then cooled immediately, which property of steel is enhance.
14. Which is the suitable nitriding process for all alloyed and unalloyed steels?
15. The process of heating metal below 400o c and then cooling in water is called─
16. The objective of steel’s tempering is
17. For HSS hardening, the soft metal is first overheated and then cooled in ─
18. After heat treatment, a component cracks. What is the possible reason behind that?
19. What is the maximum temperature at which the internal structure of metal starts to change called?
20. The purpose of annealing is to-
21. Which heat treatment method is used to make a hard job suitable for machining?
22. The first stage of case hardening carburizing. The purpose of carburizing is-
23. High speed steel is pre-heated before heating at the right hardening temperature. The reason behind this is –
24. Name of the method shown in the figure below─
25. Which heat treatment method is generally used to remove internal stress by hardening tools?

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