1. Richter Leeb
The Leeb hardness is designed using state-of-the-art microprocessor technology based on the latest Leeb hardness test principles.
2. Brinell hardness (HB)
A certain size (usually 3000kg) of a hardened steel ball of a certain size (typically 10mm in diameter) is pressed into the surface of the material for a period of time. After the load is removed, the ratio of the load to the area of ​​the indentation is the Brinell hardness value ( HB), the unit is kg/mm2 (N/mm2).
3. Rockwell hardness (HR)
When HB>450 or the sample is too small, the Brinell hardness test cannot be used instead of the Rockwell hardness measurement. It uses a diamond cone with a apex angle of 120° or a steel ball with a diameter of 1.59 and 3.18 mm, and is pressed into the surface of the material to be tested under a certain load, and the hardness of the material is determined from the depth of the indentation. According to the hardness of the test material, it is divided into three different types of earthworms. HRA: It is a hardness obtained by using a 60kg load and a diamond cone indenter for materials with extremely high hardness (such as cemented carbide).
HRB: It is a hardened steel ball with a load of 100kg and a diameter of 1.58mm. The hardness is used for materials with lower hardness (such as annealed steel, cast iron, etc.).
HRC: is the hardness obtained by using a 150kg load and a diamond cone indenter for materials with high hardness (such as hardened steel).
4. Vickers hardness (HV)
The surface of the material is pressed into the surface of the material with a load of 120 kg or less and a diamond square cone presser with a apex angle of 136°. The surface area of ​​the material indentation pit is divided by the load value, which is the Vickers hardness value (HV).
5 Knoop hardness (HK)
Try the hardness test of high hardness materials (usually hardness measurement above HV1000 hardness),
The hardness test is the simplest and most convenient test method in the mechanical properties test. In order to be able to replace some mechanical properties tests with hardness tests, a relatively accurate conversion relationship between hardness and strength is required for production.
The above hardness is only a few commonly used, in addition to Shore (HS) hardness, Shore (HS) hardness, Barcol hardness, Mohs hardness and the like. Practice has proved that there is an approximate relationship between the hardness values ​​and the strength values ​​of various hardness values ​​of metal materials. Since the hardness value is determined by the initial plastic deformation resistance and the continued plastic deformation resistance, the higher the strength of the material, the higher the plastic deformation resistance and the higher the hardness value.
The Leeb hardness is designed using state-of-the-art microprocessor technology based on the latest Leeb hardness test principles.
2. Brinell hardness (HB)
A certain size (usually 3000kg) of a hardened steel ball of a certain size (typically 10mm in diameter) is pressed into the surface of the material for a period of time. After the load is removed, the ratio of the load to the area of ​​the indentation is the Brinell hardness value ( HB), the unit is kg/mm2 (N/mm2).
3. Rockwell hardness (HR)
When HB>450 or the sample is too small, the Brinell hardness test cannot be used instead of the Rockwell hardness measurement. It uses a diamond cone with a apex angle of 120° or a steel ball with a diameter of 1.59 and 3.18 mm, and is pressed into the surface of the material to be tested under a certain load, and the hardness of the material is determined from the depth of the indentation. According to the hardness of the test material, it is divided into three different types of earthworms. HRA: It is a hardness obtained by using a 60kg load and a diamond cone indenter for materials with extremely high hardness (such as cemented carbide).
HRB: It is a hardened steel ball with a load of 100kg and a diameter of 1.58mm. The hardness is used for materials with lower hardness (such as annealed steel, cast iron, etc.).
HRC: is the hardness obtained by using a 150kg load and a diamond cone indenter for materials with high hardness (such as hardened steel).
4. Vickers hardness (HV)
The surface of the material is pressed into the surface of the material with a load of 120 kg or less and a diamond square cone presser with a apex angle of 136°. The surface area of ​​the material indentation pit is divided by the load value, which is the Vickers hardness value (HV).
5 Knoop hardness (HK)
Try the hardness test of high hardness materials (usually hardness measurement above HV1000 hardness),
The hardness test is the simplest and most convenient test method in the mechanical properties test. In order to be able to replace some mechanical properties tests with hardness tests, a relatively accurate conversion relationship between hardness and strength is required for production.
The above hardness is only a few commonly used, in addition to Shore (HS) hardness, Shore (HS) hardness, Barcol hardness, Mohs hardness and the like. Practice has proved that there is an approximate relationship between the hardness values ​​and the strength values ​​of various hardness values ​​of metal materials. Since the hardness value is determined by the initial plastic deformation resistance and the continued plastic deformation resistance, the higher the strength of the material, the higher the plastic deformation resistance and the higher the hardness value.
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