The control of the raw materials of the mold is carried […]
The control of the raw materials of the mold is carried out in the following aspects:
The chemical composition is decisive for ensuring the performance of the steel, but the composition is qualified, and the steel properties cannot be fully explained. Due to the uneven organization and composition of the steel, the macroscopic inspection largely complements this deficiency.
Macroscopic inspection can observe the crystallization of steel, the destruction of steel continuity and the inhomogeneity of certain components.
Standard "Low-Structure Defect Rating Chart for Structural Steel" GB1979
There are 8 common defects in macroscopic: segregation, looseness, inclusions, shrinkage cavities, bubbles, white spots, cracks, and folds.