1. Macroscopic test
Chemical composition to ensure that the performance of steel is decisive, but the composition of qualified, can not fully explain the performance of steel, due to the internal structure and composition of steel heterogeneity, macro-testing to a large extent to supplement this aspect of the deficiencies.
2.1. Evaluation of annealing organization
The purpose of annealing is to reduce the hardness of steel, facilitate machining, and also prepare for subsequent heat treatment.