Uses and recommendations of commonly used bronze bushing material grades　　1.QSn6.5-0.1, QSn6.5-0.4, QSn7-0.2, QSn8-0.3, American Standard C51900, C52100　

Inspection requirements and precautions for bronze castings
Inspection requirements:

1.Surface quality inspection: 5B test, salt spray test, and UV resistance test are required to ensure that the surface quality of castings meets the standards.

2.Shape and size inspection: According to the use requirements, flatness, parallelism, straightness and other inspections are carried out to ensure that the shape and size of the castings meet the design requirements.

3.Internal quality inspection: Including chemical composition, mechanical properties, etc., to ensure that the internal quality of the castings meets the standards.

‌Strong wear resistance‌: Bronze bushings are made of centrifugal casting and other processes, with a tight internal structure, high hardness, and excellent wear resistance. They are suitable for occasions with high wear resistance requirements such as mining machinery. ‌‌Good corrosion resistance‌: Bronze material has good corrosion resistance, can work stably in atmospheric and freshwater environments, and can resist the erosion of some chemical elements. ‌

‌Mechanical property test of bronze bushing‌

‌Hardness test‌: The hardness of bronze bushing is a key indicator. The hardness of bronze with different alloy compositions varies. For example, the hardness of pure copper is 35 degrees (Boling hardness tester), while the hardness of tin bronze increases with the increase of tin content, ranging from 50 to 80 degrees‌.

Copper bushings exhibit optimal performance in the following scenarios:

‌High friction scenario‌: In the face of high friction conditions, copper bushings can significantly reduce wear due to their excellent wear resistance and built-in lubrication properties.

The manufacturing accuracy of bronze bushing molds depends largely on the application requirements of the molds, the processing equipment used, and the processi