9. The AISI-SAE 1110 carbon steel\'s hardening temperature should be around a. 5
ID: 1867442 • Letter: 9
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9. The AISI-SAE 1110 carbon steel's hardening temperature should be around a. 500 °F-800 °F b. 1000 °F 1500 °F c. 1200 °F-1500 OF d. 1350?-1500? e. None of the above nfile harness testing lab, ?f a file bites the material without cutting we know the material has a hardness around 10. a. 30HRC b. 40HRC c 50HRC d. 60HRC e. None of the above 11. Which hardness test is appropriate for testing a very hard metal? a. Brinell b. Rockwell C c. Vickers d. Knoop e. None of the above 12. Which hardness test is appropriate for testing case-hardened materials? a. Brinell b. Rockwell C C. Vickers d. Knoop e. None of the above 13. HRc 50 is approximately equal to a BHN of (From the estimate equation) a. 500 b. 550 c. 625 d. 625 e. None of above. Which of the following steels has the lowest austenite temperature? a. AISI 1040 b. AISI 1060 c. AISI 1080 d. AISI 1144 14. 15. For the stainless steels (a), copper (b), cast iron (c), and aluminum (d), there is relationship of melting point as below d, e. a>b>cExplanation / Answer
9. None of these, as the SAE- 1100 Carbon steel has 1500- 1600°F as the hardening temperature.
10. As the file bites into the material without cutting , therefore material is softer and its hardness lies around 40 HRC.
11. Rockwell C hardness test will be most appropriate for hardness test of very hard material.
12. Normally vicker hardness test is used for measuring hardness of case hardened material.
13. HRC 50 is approximately equal to 500BHN from the formula. BHN = 11.158*HRC - 79
15. Melting temperature of steel , copper , cast iron and Aluminium is around 2700°C, 1065°C, 1150°C and 670°C
Hence correct option is a>c>b>d
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