The Brinell hardness testers manufactured by TX company apply Brinell hardness testing principle, with 5 kinds of test forces for choosing, they are:
3000kgf test force with 10mm ball indenter
1580kgf test force with 7.26mm ball indenter
500kgf test force with 2.5mm ball indenter
187.5/62.5kgf test force with 2.5mm/5mm ball indenter
Test range can be from 32 HBW to 650 HBW. Test force error and indication error which comply with ISO and ASTM standards are less than 1% except the pin impact Brinell hardness tester being less than 5%.
As the light weight and being convenient to take, Brinell hardness tester is a portable instrument that can be used in the workshop. It is easy to operate and carry. It can realize the detection of large parts by piece. The portable Brinell hardness testers are widely used on site to test the metal hardness without taking samples.
1. The Brinell hardness tester is the most common used hardness tester. Brinell hardness tester applies Brinell test method, and has good accuracy, repeatability and stability.
2. The conversion between Brinell hardness and other hardness
The choice of Brinell hardness test conditions is the same with the choice on scale of Rockwell hardness test. Brinell hardness test also encountered the choice of test conditions, that is the choice of test force F and pressure ball diameter D. This choice is not arbitrary, but to follow certain rules and pay attention to the reasonable match of the test force and pressure ball diameter. Therefore, its application is slightly complex than Rockwell hardness test.
Hardness is a measure of the softness of the material. There are many different hardness test methods whose principle are definitely different, measured hardness values and meaning are not exactly the same. Brinell hardness(HB), Rockwell hardness(HRA, HRB, HRC), Vickers hardness (HV), rubber and plastic Shore hardness (HA, HD), etc. are the most common static load press hardness tests of which the value of the material show its surface ability to resistant the press of hard objects. Therefore, the hardness is not a simple physical quantity, it reflects a comprehensive performance including elasticity, plasticity, strength and toughness of the material.
Hardness of steel: the code of steel Hardness is H. Depending on the different hardness test method,
● The common methods are Brinell hardness (HB), Rockwell hardness (HRC), Vickers hardness (HV), and Richard hardness (HL), among which HB and HRC are more commonly used.
● HB has wide range of applications, while HRC is suit for high hardness materials, such as heat treatment hardness. The difference between the two is that they have different probe. The probe of Brinell hardness is the carbide ball, and the probe of Rockwell hardness is diamond.
● HV is suitable for microscopic analysis. Vickers hardness (HV) press into the material surface with diamond square cone for about 120kg load and the top angle of 136 °, then the surface area of the indentation of the material is divided by the load value that is, Vickers hardness (HV ).
● HL hand-held hardness tester is easy to measure. The impact ball assaults the hardness surface to generate bounce; the hardness is calculate by the ratio of the impact speed and rebound speed at 1mm between the impact ball and the sample. The formula: Hardness HL = 1000 × VB (rebound speed) / VA (impact speed).
HB - Brinell Hardness:
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.
Brinell hardness (HB) press a certain diameter of hardened steel ball or carbide ball into the metal surface to be measured with a certain size of the test force to maintain the specified time, and then remove the test force, measuring the measured surface indentation diameter. The Brinell hardness value is the quotient of the indentation spherical surface area divided by the test force. Generally: press a certain size (diameter is generally 10mm) of hardened steel ball into the material surface with a certain test force (usually 3000kg) to maintain a period of time, then remove the test force, the ratio of load and its indentation area is the Brinell hardness (HB) in kg / mm2 (N / mm2). (For details of Brinell hardness (HB), please click "Brinell hardness tester PHB-3000")