What does the Brinell hardness number mean?
Table of Contents
What does the Brinell hardness number mean?
The Brinell hardness number is a number proportional to the load or test force of a hard steel ball to the calculated curved area of the indentation formed. The ball diameter is 1, 2.5, 5, or 10 mm.
How do you write a Brinell hardness number?
The Brinell hardness test is commonly used to determine the hardness of materials like metals and alloys. It is desirable that the test load are limited to a impression diameter in the range of 2.5 to 4.75 mm….Typical Brinell Hardness Numbers for Metals.
| Material | Brinell Hardness Number |
|---|---|
| Nitrided surface | 750 |
What are the units of Brinell hardness number?
P is the applied load of 3,000, 1,500, or 500kg. d is the mean diameter of the indentation in mm. The units of HB are kg/mm^2. However, the results are usually reported with no units.
What does a water hardness of 15 mean?
11–15: Considered very hard, water at 11–15 gpg exhibits all the signs of hard water all the time. 15+: Extremely hard water is anything over 15 gpg. Glasses are extra spotty, skin feels super squeaky, and soap scum is at its most stubborn.
What is the highest Brinell hardness?
DEFINITION OF THE BRINELL HARDNESS TEST
- Indenter sizes: 1, 2.5, 5 and 10 mm.
- Loads: From 1 kgf to 3000 kgf.
- Maximum hardness: 650 HBW.
How do you read a Brinell scope?
Reading Brinell Impressions Manual reading is easy and straightforward. You look through the lenses, focus the optics, position in the lens on the impression and read the result in mm. The result in mm is then converted to HBW (Hardness Brinell) by looking up the mm measurement and the table provides the hardness.
How is Brinell hardness measured?
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.
Is 16 gpg hard water?
One grain per gallon (gpg) is equivalent to 17.14 parts per million (ppm). HomeWater 101 says that water hardness of 0 to 3 gpg is soft water, 3 to 7 gpg is moderately hard and 7 to 11 gpg is considered hard. Anything more than 11 is considered very hard.
What is standard loads range for Brinell hardness machine?
between 187.5 and 3000Kgf
The Brinell hardness test consists of applying a constant load or force, usually between 187.5 and 3000Kgf, for a specified time (from 10 – 30 seconds) typically using a 2.5 or 10mm diameter tungsten carbide ball (see schematic in the image to your right – Figure 23.3).
What does a higher hardness value mean?
Hardness of a mineral may be obtained by the Mohs scale of hardness shown in Table 22.1. The number for each mineral in Table 22.1 indicates its hardness. A higher number means the mineral is harder than the next lower number. Minerals with a higher number can scratch the ones with the same or a lower number.
How is hardness number calculated?
To calculate Brinell hardness number:
- Enter the load applied, P = 294.2 N .
- Insert the diameter of the indentor, D = 10 mm .
- Fill in the diameter of indentation, d = 3 mm .
- The Brinell hardness number (HBW) is then calculated:
