BACKSeamless steel pipe
GR15 bearing steel pipe
Description:The production of bearing steel pipe refers to the refining of bearing steel, bearing steel and chromium free bearing steel and chromium free bearing steel. Production of pipe for making bearing rings. Bearing steel pipe for high size precision pipe, multi-use two, three roller skew extension machine (see pipe skew extension) hot rolling production, smaller specifications need to be cold rolling, cold drawing production. Using long steel pipe instead of single piece forging or round steel turning to produce bearing bushing can save metal, simplify bearing manufacturing process and reduce bearing cost
parameters
Gr15 bearing steel pipe cooling. The cooling after hot rolling should make the bearing steel pipe have good microstructure, that is, fine flake pearlite and no mesh carbide precipitation. This kind of structure can create conditions for obtaining fine spherical pearlite after spheroidizing annealing of bearing steel pipe. Because chromium bearing steel pipe after hot rolling cooling to 850 ~ 900℃ began to have a large number of carbide precipitation and network distribution, so the final rolling temperature should be controlled above 850℃, and take fast cooling to prevent carbide precipitation. In order to achieve rapid cooling, a fan or spray device is generally installed on the cold bed or at the input roller table of the cold bed.
introduction
Gr15 bearing steel pipe smelting quality requirements are very high, the need to strictly control the content of sulfur, phosphorus, hydrogen and the number, size and distribution of non-metallic inclusions and carbides, because the number, size and distribution of non-metallic inclusions and carbides have a great impact on the service life of Gr15 bearing steel pipe. Often the failure of bearings is caused by the propagation of micro-cracks around large inclusions or carbides. The content of inclusions is closely related to the oxygen content in steel, and the higher the oxygen content, the more inclusions and the shorter the life
