Brinell hardness

Brinell hardness (HB) is pressed into the surface of the model with a specified diameter of the steel ball or carbide ball with a specified test force (F). After the specified holding time, the test force is removed and the diameter of the indentation on the surface of the sample is measured. L). The Brinell hardness value is the quotient obtained by dividing the test force by the spherical surface area of the indentation. It is expressed by HBS (steel ball) and the unit is N/mm2 (MPa). Determination of Brinell hardness is more accurate and reliable, but generally HBS is only suitable for metal materials below 450N/mm2 (MPa), not suitable for harder steel or thinner plates. Among the steel pipe standards, Brinell hardness is the most widely used, and the hardness of the material is often expressed by the indentation diameter d, which is both intuitive and convenient.

Brinell hardness tester is mainly used for hardness measurement of cast iron, steel, non-ferrous metals and soft alloys. Brinell hardness test is the largest test method for indentation in all hardness tests. It can reflect the comprehensive performance of materials. It is a highly accurate hardness test method due to the microsegregation of the sample structure and the uneven composition.

Brinell hardness tester is mainly used for the hardness test of uneven forged steel and cast iron. The Brinell hardness of forged steel and gray cast iron has a good correspondence with the tensile test. The Brinell hardness test can also be used for non-ferrous metals and mild steels, and small diameter ball indenters can be used to measure small and thin materials. Brinell hardness testers are mostly used for the detection of raw materials and semi-finished products. Because of the large indentation, they are generally not used for finished product inspection.