Metallurgical defects of the hottest bearing steel

2022-09-23
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Metallurgical defects of bearing steel

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metallurgical quality defects of bearing steel include all defects that may be caused in the metallurgical process of smelting, casting, rolling and forging. According to its inspection method, it can be generally divided into macro defects and micro defects

1. The macro defects of Tableland silk design and repeated processing are combined

including pitting, cracks, folding, cracking, scratching, scarring and slag inclusion that can be found in the surface appearance inspection, as well as high-precision shrinkage cavities, subcutaneous bubbles, white spots, overburning, central porosity, general porosity and segregation, surface decarburization that can be found in the low power pickling inspection. These are common defects of general steel. All kinds of special standards for bearing steel have strict regulations on the control of these defects

2. Microscopic defects

the microscopic defects of steel include all kinds of non-metallic inclusions, carbide segregation, carbide like and banded, annealing structure inhomogeneity, etc. that can be found in the steel under the magnification inspection under the optical microscope. These are the main defects that affect the purity and uniformity of steel. Strictly controlling these technical indicators and reducing them as much as possible is the main content of the technical requirements of all kinds of bearing steel

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