Table of Contents
How do you measure BHN hardness?
The Brinell hardness number is obtained by dividing the load, in kilograms, by the spherical area of the indentation in square millimetres; this area is a function of the ball diameter and the depth of the indentation.
Can you convert Rockwell to Brinell?
The following two conversion tables come from standard ASTM A 370….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 |
| From 41 to 50 | HB = 11.158 * HRC – 79.6 |
| From 51 to 60 | HB = 17.515 * HRC – 401 |
What hardness values are expressed in Rockwell hardness test?
Rockwell hardness values are expressed as a combination of a hardness number and a scale symbol representing the indenter and the minor and major loads. The hardness number is expressed by the symbol HR and the scale designation. 63HRC signifies a hardness of 63 on the Rockwell C scale.
What is the value of BHN which is used as a hardness unit?
Common values
| Material | Hardness |
|---|---|
| Hardwood | 2.6–7.0 HBS 10/100 |
| Lead | 5.0 HB (pure lead; alloyed lead typically can range from 5.0 HB to values in excess of 22.0 HB) |
| Pure Aluminium | 15 HB |
| Copper | 35 HB |
How do you convert HRB to BHN?
HB – ball 10 mm, load 29,400N (3000 kgf) durata 15 seconds. BHN – Brinell Hardness Number, which is the same meaning as HB….Formula B – Convert HRB into HB.
| Rockwell B Hardness (HRB) | Brinell Hardness (HB) |
|---|---|
| From 70 to 79 | HB = 2.394 * HRB – 42.7 |
| From 80 to 89 | HB = 3.297 * HRB – 114 |
| From 90 to 100 | HB = 5.582 * HRB – 319 |
What is Brinell hardness number?
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 does Brinell hardness relate to Rockwell hardness?
The Brinell hardness testing uses a 10mm hardened steel ball, while the Rockwell test uses either a much smaller steel ball (<4mm) or a diamond cone, depending on the material being tested. The Rockwell test measure the depth of the indentation, while the Brinell test measures the width of the indentation.
How do you read a Rockwell hardness scale?
The Rockwell C scale is usually abbreviated HRC (Hardness Rockwell C), while the Rockwell B scale is abbreviated HRB (Hardness Rockwell B). The higher the number, the harder the material, but only relative to other numbers within a given scale.
Can the Rockwell hardness test be automated?
The Rockwell Hardness Test is conveient to automate, but it suffers from many arbitrary scales and possible effects from the specimen support anvil. The Vickers and Brinell methods don’t suffer from this effect.
How do you convert Rockwell hardness to units?
Hardness conversion calculator for Rockwell, Brinell, Vickers, Shore Scleroscope, and Tensile Strength…. The Hardness Conversion Calculator is particularly handy. Enter a from value, select the from units, enter the “to” units, and G-Wizard will give you a value (if there is one) in the new hardness units. Here’s a closeup of the unit selector:
How do you specify a Brinell hardness number?
Specifying Brinell Hardness Number While specifying a Brinell hardness number (BHN or HB), the test conditions used to obtain the number must be specified. The standard format for specifying is “HBW 10/3000”. “HBW” refers to a tungsten carbide ball used as an indenter, as opposed to “HBS”, which means a hardened steel ball.
What is the difference between C60 and B80 Rockwell penetration?
One regular Rockwell number represents a penetration of 0.002 mm (0.000080 inch). Therefore, a reading of C60 indicates penetration from minor to major load of (100 to 60 Rockwell points) x 0.002 mm = 0.080 mm or 0.0032 inch. A reading of B80 indicates a penetration of (130 to 80 Rockwell points) x 0.002 = 0.100 mm or 0.004 inch.