English
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русскийThe control of the raw materials of the mold is carried out from the following aspects:
macro inspection
The chemical composition is decisive to ensure the performance of the steel, but the composition is qualified and cannot fully explain the performance of the steel. Due to the inhomogeneity of the internal structure and composition of the steel, the macro inspection supplements this deficiency to a large extent.
Macroscopic inspection can observe the crystallization of the steel, the failure of the continuity of the steel and the inhomogeneity of some components.
Standard "Low-Magnification Structure Defect Rating Chart of Structural Steel" GB1979
There are 8 common macro defects: segregation, porosity, inclusions, shrinkage cavities, bubbles, white spots, cracks, and folds.
