In Rockwell B hardness testing, what indenter and load are used?

In Rockwell B hardness testing, what indenter and load are used?

• A. 2 mm ball with 100 kg load
• B. 1 mm ball with 50 kg load
• C. Diamond indenter with 150 kg load
• D. Conical indenter with 100 kg load

Answer: (A)

In Rockwell hardness testing, the B scale uses a steel ball indenter and a major load of about 100 kg (applied after a small initial minor load). The diamond indenter is used for the C scale and higher, and a conical indenter isn’t used for Rockwell testing. So a ball indenter with a 100 kg major load matches the Rockwell B setup, which is why that option is the best choice.

In Rockwell hardness testing, the B scale uses a steel ball indenter and a major load of about 100 kg (applied after a small initial minor load). The diamond indenter is used for the C scale and higher, and a conical indenter isn’t used for Rockwell testing. So a ball indenter with a 100 kg major load matches the Rockwell B setup, which is why that option is the best choice.