Brinell hardness test

Brinell hardness test definitions

Brinell hardness test was originally developed by a Swedish engineer in the late 19th century, is named after the test.The engineers want to find a way to control the quality of steel/hardness.His solution is to a train wheel bearing ball pressure into the material under test, and then produced by measuring the size of the indentation.This method is proved to be very reliable, so the brinell hardness test also was born in 1900.

Now the brinell test using a brinell hardness test device for execution.The machine会将碳化钨球压入试样，然后通过光学方式测量压痕的直径。

• Indentation size: 1, 2.5, 5 and 10 mm
• KGF to 3000 KGF load: 1
• The maximum hardness: 650 HBW

A kind of for large specimen hardness testing

Because the brinell hardness test (HBW) will leave relatively large indentation, so the brinell hardness test is more suitable for a rough or uneven grain structure of the larger samples, such as castings and forgings.

instructions

HBW refers to the brinell hardness of tungsten carbide.The tungsten carbide here refers to the relatively new brinell standards, require the use of tungsten carbide balls (rather than use a soft ball (HBS) before).The high hardness, values will be different

The most commonly used brinell hardness test method

According to the corresponding material and hardness range, there are all sorts of brinell hardness test methods to choose from.Most of the test method can be performed through a variety of brinell hardness test machine.

Brinell method is generally divided into four groups (HB30, HB10, HB5, HB2.5), each subgroup is suitable for different materials.

• Each group have the same force/diameter ratio (F/D²)
• Measurement of brinell hardness can only compare within each subgroup

*The materials mentioned in the table are only some of the typical material sample.

instructions

• HBW 2.5/187.5: brinell 2.5 mm tungsten carbide balls and 187.5 KGF load.
• HBW 5/750: brinell 5.0 mm tungsten carbide balls and 750 KGF load.