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.