The Rockwell B scale is used on harder metals like steel.

The Rockwell B scale is used on harder metals like steel.

• A. True
• B. False
• C. Not applicable
• D. Sometimes

Answer: (B)

Rockwell hardness testing uses different scales that pair specific indenters and loads with material ranges. The B scale uses a steel ball indenter and is intended for softer metals such as mild steel, copper alloys, aluminum, and similar materials. For harder steels and alloys, the C scale is used, as it employs a diamond cone indenter and provides reliable measurements in the hard-material range. So saying the B scale is used on harder metals like steel isn’t correct; the C scale (or other appropriate scales) is used for those harder materials.

Rockwell hardness testing uses different scales that pair specific indenters and loads with material ranges. The B scale uses a steel ball indenter and is intended for softer metals such as mild steel, copper alloys, aluminum, and similar materials. For harder steels and alloys, the C scale is used, as it employs a diamond cone indenter and provides reliable measurements in the hard-material range. So saying the B scale is used on harder metals like steel isn’t correct; the C scale (or other appropriate scales) is used for those harder materials.