The ASTM B648-23 standard specifies the method of measuring the indentation hardness of aluminum alloys using the Pasteur hardness gauge. This method forms indentation on the surface of aluminum alloys by applying a certain pressure, and uses the depth of the Pasteur hardness gauge measurement indentation to evaluate the hardness of the material. The standard is applicable to various aluminum alloys and their alloying materials, and is widely used for quality control and performance evaluation of aluminum alloys. The standard describes in detail the test equipment, operation steps, and the method of hardness value conversion, ensuring that the test results have high accuracy and comparability. This method has important application value in the production, processing and application of aluminum alloys.