Topic: Manufacturing Processes
Machinability index for SAE1112 steel is
- A. 50%
- B. 75%
- C. 100%
- D. None of the above
Answer: C. 100%
Explanation: Free-machining steel SAE 1112 (or B1112) is universally used as the standard reference material for evaluating the machinability of other metals. Its machinability rating is arbitrarily established at an index of 100%.