Inclusion behavior bearing steel smelting process and the a

Bearing steel is the most representative types of steel, special steel served its working conditions, high service life, one of the most widely used is a delegate with GCr15 bearing steel with high carbon content. From the perspective of smelting, inclusions and carbide is bearing steel quality evaluation of two hallmarks. Inclusions will destroy the continuity of matrix in steel, bearing the use of worse performance, should be lower, the better. In smelting process, especially in the process of refining outside the furnace, a reduction in the number of inclusions, improve the morphology of inclusions, nature, is particularly important Purchase For SKF Bearings to improve the use performance of bearing steel. From jiangsu university researchers using metallographic, SEM analysis methods, such as sampling analysis of a certain enterprise EAF - LF - VD - CC process of the non-metallic inclusions GCr15 bearing steel refining process, the test results show that after LF process, inclusion in clouds of Al2O3, dot deformation and sulfide inclusions; After VD treatment, Al2O3 and dot deformation inclusions significantly reduced, and contains calcium, magnesium, aluminum, such as sulfur compound inclusions increased; Not found in timber specimen dot deformation inclusion, only a small amount of small size of Al2O3, sulfide and calcium, magnesium, aluminum, sulfur and other composite inclusions; The refining process, the mixed quantity is on the decline. Inclusions, chromium iron chromium acid salt mainly and dissolved oxygen in molten steel reaction generated; Aluminum oxide inclusions mainly comes from the aluminium deoxidizing products; Which is mainly composed of calcium aluminate dot deformation inclusions from deoxidizing products, and the calcium and magnesium from lining and slag. Sulfur from sulfur and sulfide in steel form elements Ca, Mn, such as chemical reaction, nucleation some such as alumina oxide as the core.