# How do you convert Rockwell hardness to Brinell hardness?

## How do you convert Rockwell hardness to Brinell hardness?

HB – ball 10 mm, load 29,400N (3000 kgf) durata 15 seconds….Formula A – Convert HRC into HB.

Rockwell C Hardness (HRC) Brinell Hardness (HB)
From 21 to 30 HB = 5.970 * HRC + 104.7
From 31 to 40 HB = 8.570 * HRC + 27.6

## What is Rockwell hardness B?

The Rockwell B scale uses a 1/16-inch diameter ball indenter with a 100-kg load. The Rockwell C scale is usually abbreviated HRC (Hardness Rockwell C), while the Rockwell B scale is abbreviated HRB (Hardness Rockwell B). Rockwell B is better for softer steel or relatively hard aluminum.

What is the relation between Brinell hardness number and Rockwell hardness number?

Brinell hardness (HB) is generally used for the soft material, such as non-ferrous metals, steel before heat treated or after annealing. Rockwell hardness (HRC) is generally used for high hardness materials, such as the hardness after heat treatment and so on.

### How do you find the Brinell hardness number?

Brinell hardness is determined by forcing a hardened steel or carbide ball of known diameter under a known load into a surface and measuring the diameter of the indentation with a microscope.

### What is Rockwell Brinell hardness?

Brinell’s Hardness (HB) is the ratio of the applied force F (N) and the surface of the fingerprint S (mm2): HBW = (F*0.102/ S); S = π* D* h. In Rockwell’s method HRB = 130 – (e/0.002); HRC = 100 – (e/0.002)

What is the difference between Rockwell B and Rockwell C?

For example, the Rockwell C scale uses a cone-shaped, diamond-tipped indenter with a 150-kg load. The Rockwell B scale uses a 1/16-inch diameter ball indenter with a 100-kg load. The Rockwell C scale is good for measuring hardened steel. Rockwell B is better for softer steel or relatively hard aluminum.

## What is the Rockwell hardness number?

The Rockwell hardness number is expressed as a combination of the measured numerical hardness value and the scale letter preceded by the letters, HR. For example, a hardness value of 80 on the Rockwell A scale is reported as 80 HRA.