Shrinkage hole: the shrinkage cavity formed when the molten steel shrinks in the steel mold is called shrinkage hole.
Transverse crack: refers to the transverse crack that occurs on the surface of the steel ingot, generally on the steel ingot, generally shallow depth, can be removed by fine grinding.
Longitudinal crack: refers to the longitudinal crack generated on the surface of the ingot, generally in the upper part and the corner of the ingot, and the crack in the upper part is very deep, which is difficult to be removed by grinding.
Crust: the surface of the ingot, which is called the crusting of the shell-like or tumor-like metal, is often found in the lower part of the ingot.
Heavy leather: at the edge of the low-magnification test piece, when an irregular dark color is loose, a large amount of oxide inclusions are accumulated around it (mainly ferrous oxide).
Surface inclusion: refers to the non-reduced inclusions visible on the surface of the ingot.
Surface stomata: refers to the small holes visible to the naked eye on the surface of the steel ingot. It is more common in the lower part of the steel ingot, generally not deep, and can be removed by finishing.
Explosion: the crack generated when the surface of the ingot is extremely cold. Because of the frequent cracking when cracking, it is called bursting.
Rise: the ingot's head is irregularly raised, and this defect is called rising, also called rising.
Netting: the mesh-like protrusions appearing on the surface of steel ingots are called netting.
Ma pit: the pit existing on the surface of the steel ingot is called a pit.
Double pouring: obvious visible traces around the surface of the ingot.
Flash: a sheet of metal that exists on the head or tail of a steel ingot perpendicular to the surface of the ingot.
Fins: a sheet formed on the surface of a steel ingot perpendicular to the surface of the ingot is called a fin.
Bubbles: bubbles are steel ingots or just defects caused by poor degassing and deoxidation of molten steel or wet materials in the steel injection system. Generally, they are divided into subcutaneous bubbles and internal bubbles. (Prevention method: molten steel oxidation boiling reduction and deoxidation should be good, furnace talk and all refractory materials in contact with molten steel should be dry, tapping trough, steamed buns, hand boards, molds, etc. should be dry, mold rust spots should be cleaned, oiling should be thin. )
White point: the white point is actually a kind of fine crack. It is a radioactive irregular sawtooth crack on the horizontal low-spectrum sample. It is a silver or bright point of a circular or elliptical star on the longitudinal low-magnification sample, so it is called white point. . (The main cause is hydrogen)
