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In order to accurately determine the extent of overheating, to observe the microstructure. If GCr15 steel hardened appear coarse acicular martensite hardening heat tissue. The formation may be due to the quenching temperature is too high or the heating caused by overheating of the whole holding time is too long, carbide original tape can also be caused by serious organization, between the two regions.
Withstand high impact loads rail, rolling mill bearings, etc., used mainly in the form after quenching unqualified M: inner sleeve Assembly cracking, use a block away from the outer wall of the process, internal fragmentation, and austempering Bearing the impact toughness, surface stress, fractures assembly sets, or jacket, inner sleeve fracture orientation greatly reduced, and the edge of the roller block out of the wall can be used to reduce stress concentration. Therefore, in the isothermal quenching, after quenching the average life expectancy than M and higher reliability.
Precise heat treatment has two meanings: one is the basic part of the requirements, materials, structure, size, knowledge and physical metallurgy and advanced computer simulation technology test used in order to optimize the process parameters to achieve the required performance or minimize potential of the material; other hand is fully optimized to ensure that the process is stable, achieve product quality dispersion is small (or zero) and the thermal deformation is zero.
Scientific production and energy management is the most efficient use of energy potential factors, specialized heat treatment plant in order to ensure full capacity, full capacity production equipment is the scientific management options. In the thermal energy structure, preference primary energy, make full use of waste heat, waste heat; using low-energy, short cycle, rather than a long life-cycle energy consumption and process.
Instead of using a protective atmosphere, heated to a precisely controlled heated atmosphere of carbon, nitrogen potential thermal oxidation potential of controlled atmosphere, heat treatment of parts to improve heat as decarburization defects, cracks and other properties, greatly reducing heat treatment to improve the finishing material left utilization and efficiency of the machine in order to reduce the amount. Vacuum heating quenching, vacuum or low pressure carburizing, nitriding, carbonitriding and borides, etc., can significantly improve product quality, reduce distortion, improve their lives.
In the railway, rolling bearings production, due to the large size of the ring, weight, oil quenching medium organizations brittle, in order to obtain high hardness after rolling quenching are usually taken strong measures, resulting in quenching microcracks; and BL quenching, as "Basic "How much better organized than the toughness and the surface tissues up to M-400-500MPa compressive stress level, which greatly reduces the tendency of quenching cracks; surface grinding stress offset some of the decline in the overall stress level, greatly reducing the wear cutting stress grinding cracks.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7202BDF NSK | 15 | 35 | 11 |
| 7202ADF NSK | 15 | 35 | 11 |