Impact of small indentation diameter measurement accuracy: According to the Brinell hardness calculation formula, indentation measurement error has a significant impact on the error of hardness values, so the error of indentation measurement is the main source of error. If the indentation diameter measurement value is too large, the calculated hardness value will be too small, otherwise, the hardness value will be higher than the i1i accuracy value. Based on the formula, It can be concluded that the relative error of the hardness value is twice the relative error of the indentation measurement. In order to reduce the error, it is necessary to ensure the accuracy of the microscope used to measure the indentation diameter. Secondly, when conditions permit, larger loading forces and larger steel balls should be selected for measurement. Because the larger the diameter of the l+. mark, the smaller the relative error.

Effect of test load force: If the test load force increases, the measured hardness will decrease, and conversely, the hardness value will increase. The Brinell hardness will change with the change of load force. The compliance of the Brinell hardness test depends on the accuracy of the code removal, the accuracy of the load application device, and the correctness of the load application method. Practice has shown that the relative error of the hardness value is related to the relative error of the load. Therefore, to improve the measurement accuracy of hardness values, it is necessary to reduce load errors. For example, operators should operate according to the basic principles of Brinell hardness, and regularly inspect and calibrate the Brinell hardness tester. Tests should be conducted under the standard conditions of Brinell hardness testing.