The mechanical properties of bronze bushing are important indicators of the quality of most bronze bushing castings and are often used as the basis for acceptance. 

However, it is very difficult and usually impossible to measure the mechanical properties of castings under exactly the same load under working conditions.

In fact, in most cases, testing the mechanical properties of bronze bushing castings is to test specimens that are assumed to be similar to the castings, and then 

infer the mechanical properties of the castings based on the test results of the specimens.

　　In order to correctly evaluate the mechanical properties of castings, it is very important to prepare samples reasonably and conduct performance tests accurately.

　　There are three commonly used testing (testing) methods for mechanical properties of copper sleeves: tensile test, impact test and hardness test.

　　1. Tensile test method

　　Tensile test is one of the most important inspection items for the mechanical properties of bronze bushing. When conducting tensile testing, it should generally be performed in accordance with the standard GB/T9228-2002 metal tensile testing method.

　　2. Impact test method

　　Impact test is one of the mechanical properties that need to be tested for many bronze bushing castings. When conducting impact tests, the standard GB/T229-1994 Metal Charpy (U-shaped notch) impact test method and the GB/T229-1994 Metal Charpy (V-shaped notch) impact test method should generally be performed at room temperature.

　　3. Hardness test method

　　The hardness test can test the softness and hardness of bronze bushing castings and sensitively reflect the differences in the chemical composition and organizational structure of the castings.

　　The hardness commonly tested for castings include Brinell hardness, Rockwell hardness, Vickers hardness, Shore hardness, Leeb hardness, etc. When conducting hardness testing, the standard GB/T231.1-2002 Metal Brinell Hardness Test Method should generally be followed. GB/T230-1991 Metal Rockwell hardness test method, GB/T4340.1-1999 Metal Vickers hardness test Part 1: Test method, GB/T4341-2001 Metal Shore hardness test method and GB/T17394-1998 Metal Leeb Hardness test method is implemented.