(1) clean heat treatment
Heat treatment salt formation of production waste water, waste gas, waste, dust, noise and electromagnetic radiation will cause pollution to the environment. Solution heat treatment of environmental pollution, introduction of clean heat treatment (or green heat treatment) is one of the heat treatment technology development in developed countries. For the reduction of SO2, CO, CO2, emissions, dust and cinders, has largely put an end to using coal as fuel, and less heavy fuel oil usage, mostly fuelled by light gas oil, natural gas remains the most ideal fuels.
Combustion furnace of waste heat uses has reached is high of degree, combustion Manager structure of optimization and empty-burning than of strictly control guarantee has reasonable combustion of premise Xia, makes NOX and CO reduced to minimum limits; using gas carburizing, and carbon nitrogen total permeability and the vacuum heat treatment technology alternative salt bath processing to reduced waste salt and the containing CN-has poison on water of pollution; used water-soluble synthesis quenching oil instead of part quenching oil, used biological can degradation vegetable oil instead of part mineral oil to reduced oil pollution.
(2) precision heat treatment
Precision heat treatment has two area of meaning: while is according to parts of using requirements, and material, and structure size, uses physical metallurgical knowledge and the advanced of computer simulation and detection technology, optimization technology parameter, reached by needed of performance or maximum to play material of potential; on the is full guarantee optimization technology of stability, achieved products quality dispersed degrees is small (or for zero) and the heat treatment during orthodontic becomes zero.
(3) energy-saving heat treatment
Scientific production and energy management energy efficiency factors with the greatest potential, establishing specialized heat treatment plant to guarantee the equipment capacity are producing at full capacity, full selection of scientific management. In terms of heat treatment energy sources structure, preferred primary energy; full use of waste heat, heat; technology of using low energy consumption, short instead of long cycle, process energy consumption and so on.
(4) with little or no oxidation of heat treatment
Replaced by using protective atmosphere heating in oxidizing atmosphere is heated to precisely control the carbon, nitrogen and potential climate controlled heating, improved parts performance after heat treatment, heat treatment defects such as decarburization, cracks and other significantly reduced, after thermal treatment reduces the amount of finishing, improves the utilization of materials and machine efficiency. Vacuum and hot quenching, vacuum or low pressure carburizing, nitriding, nitrocarburizing and boriding can significantly improve quality, reduce distortion and improve life.
Effect of application of heat treatment technology
(1) broadens the scope steel GCr15, General steel GCr15 m hardened rings of effective thickness is below 12mm, but BL quench cooling ability due to nitrate, the use of measures such as stirring, moving, adding water, effective wall thickness rings can be expanded to about 28 mm.
(2) stable hardness, good uniformity
Due to BL changes is a slow process, General GCr15 steel needed 4h,GCr18Mo steel needed 5h, rings in nitrate in the long time isothermal, surface heart Department Organization changes almost while for, therefore hardness stability, and uniform sexual good, General GCr15 steel BL quenching Hou hardness in 59~61HRC, uniform sexual ≤ 1 HRC, does not as quenching Shi rings wall thick slightly large some on appears hardness low, and soft points, and uniform sexual poor problem.
(3) reduce the hardening, grinding cracks
In railway, and mill bearing production in the, due to rings size large, and weight heavy, oil quenching Shi m organization brittle large, for makes quenching Hou obtained high hardness often take strong cooling measures, results led to quenching micro-crack; and BL quenching Shi, due to BL organization than m organization toughness good was more, while surface formed up to -400~-500MPa of pressure stress, great to reduces has quenching crack tendencies; in mill processing Shi surface pressure stress offset has part grinding stress, makes overall stress level declined, greatly reduced has grinding crack.
(4) bearing service life
For bear large impact load of railway, and mill bearing,, by m quenching Hou using Shi main failure forms for: Assembly Shi within set crack, using process in the by impact outer ring retaining edge off block, and within ring fragmentation, and isothermal quenching bearing due to impact toughness good, and surface pressure stress, regardless of Assembly Shi within set crack, also is using process in the coat retaining edge off block, and within set fragmentation tendency greatly reduces, and can reduced roll child of edge stress set. Therefore, upon isothermal m after hardening, average life expectancy and increased reliability.



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