What is the Difference Between HRC and HRB?

The key difference between HRC and HRB hardness scales lies in the indenters used and the materials they are typically used for. Both HRC and HRB are derived from the Rockwell hardness scale, which is an indentation hardness test used to measure the hardness of various materials. Here are the main differences between HRC and HRB:

• Indenter: HRC uses a spheroconical diamond as its indenter, while HRB uses a 1/16-inch ball as the indenter.
• Major Load: The major load of HRC is 150 kgf, while the major load of HRB is 100 kgf.
• Materials: HRC is used for measuring the hardness of materials such as hard steel, while HRB is used for materials like copper alloys, soft steels, aluminum alloys, and malleable iron.

Although there is no accurate conversion between HRC and HRB, conversion charts and formulas can be used to approximate the relationship between the two hardness scales. It is essential to consider the material thickness and softness when choosing the most suitable hardness scale for testing.

Comparative Table: HRC vs HRB

The main differences between Rockwell hardness scales HRC and HRB are the indenters used and the materials they are commonly used for. Here is a table summarizing the differences:

Both HRC and HRB are used to measure material hardness, but they use different indenters and are commonly used for different levels and thicknesses of material samples. HRC is more suitable for harder materials, such as hard steel, while HRB is used for softer materials. To convert HRC to HRB or vice versa, conversion charts and tables can be used that include approximate but accurate conversions.