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(1) Clean the heat treatment
Heat production waste water, waste gas, waste salt, dust, noise and electromagnetic radiation are causes environmental pollution. Solve the problem of environmental pollution of the heat treatment, the implementation of clean and heat treatment (or the green heat treatment) is one of the developed countries, the direction of heat treatment technology development. To reduce SO2, CO, CO2, dust and cinder emissions, has been basically put an end to the use of coal as a fuel, heavy fuel oil usage is less and less in favor of the majority of light oil, natural gas is the ideal fuel.
The combustion furnace waste heat utilization has reached a high degree of the burner structure optimization and air - fuel ratio strictly controlled to ensure a reasonable premise combustion, the NOX and CO is reduced to a minimum; gas carburizing, carbonitriding and vacuum heat treatment technology to replace the salt treatment to reduce the waste salt containing CN-toxic water pollution; using water-soluble synthetic quenching oil instead of part of the quenching oil, biodegradable vegetable oil instead of mineral oil to reduce oil pollution.
(2) precision heat treatment
Precision heat treatment has two meanings: the one hand, according to the requirements of parts, materials, structure, size, physical metallurgy knowledge and state-of-the-art computer simulation and testing technology, optimization of process parameters to achieve the required performance or maximize material potential; On the other hand fully guarantee the stability of the optimization process, product quality dispersion is very small (or zero) and zero heat distortion.
(3) energy-saving heat treatment
Scientific production and energy management is the most efficient use of energy potential factors to establish a professional heat treatment plant to ensure full capacity, give full play to the equipment capacity is the choice of the scientific management. Energy structure in the heat treatment, the preferred primary energy; make full use of waste heat, waste heat; using low-energy, short cycle process instead of a long cycle, the energy consumption of the process.
(4) less oxidation heat treatment
An oxidizing atmosphere heated to a precise control of the carbon potential by using a protective gas atmosphere is heated Alternate heating, controlled atmosphere of nitrogen potential to improve the performance of the parts after the heat treatment, heat treatment greatly reduced defects such as decarburization, cracks, etc., the finishing amount after the heat treatment to reduce to improve the efficiency of the utilization of materials and machining. Vacuum heat quenching, vacuum or low pressure carburizing, nitriding, Nitrocarburizing and Boronizing can significantly improve quality, reduce distortion, and increased life expectancy.
Heat treatment technology application effect
(1) expand the range of applications of GCr15 steel, general the GCr15 steel M quenching ferrule effective wall thickness 12mm, BL quenching ability of nitrate cooling, stirring, string action, add water, and other measures, the ferrule effective wall thickness can be extended to about 28 mm.
(2) hardness and stability, good uniformity
Since the BL change is a slow process, generally GCr15 steel need 4h the steel GCr18Mo need 5h rings nitrate in the long isothermal surface the heart organized by the Ministry of transition almost simultaneously, so the hardness and stability, good uniformity, GCr15 steel BL after quenching hardness of 59 to 61HRC, uniformity ≤ 1 HRC, not like quenching ferrule wall thickness slightly larger low hardness, soft spots, poor uniformity problems.
(3) to reduce quenching, grinding cracks
Railway, rolling bearings production, due to the ferrule size, weight, brittleness the oil quenching M organization, obtained after quenching The high hardness often take strong cooling measures, resulting in quenching micro-cracks; BL quenching due to BL organization toughness better than M organization, up to -400 to 500 MPa of the compressive stress is formed on the surface at the same time, greatly reduces the tendency to crack quenching offset some of the grinding stress; grinding surface compressive stress, so that the overall level of stress decreased greatly reduces the grinding cracks.
(4) bearing service life by
Withstand large impact loads railway, rolling mill bearings, and M after quenching from the main failure in the form of: assembling sets of cracks within the course of the the impact outer wall off the block, the inner ring fragmentation, Austempering bearing The impact toughness, surface compressive stress, regardless of the assembly sets of cracks within, or the jacket wall off the block the use of the process, greatly reduce the the inner sleeve fragmentation tendency, and can reduce the stress concentration edge of roller. By austempering after than after quenching M average life and increased reliability.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 32964XUE1 NTN | 320 | 440 | 76 |
| 32060XU NTN | 300 | 460 | 100 |