Clean heat treatment Waste water, waste gas, waste salt, dust, noise and electromagnetic radiation formed by heat treatment will pollute the environment. Solving the problem of environmental pollution in heat treatment and implementing clean heat treatment (or green heat treatment) is one of the development directions of heat treatment technology in developed countries. In order to reduce the emission of SO2, CO, CO2, dust and cinder, the use of coal as fuel has been basically eliminated, and the use of heavy oil has become less and less. The waste heat utilization of the combustion furnace has reached a high level. The optimization of the structure of the burner and the strict control of the air-fuel ratio ensure that the NOX and CO are reduced to a minimum under the premise of reasonable combustion; And vacuum heat treatment technology to replace salt bath treatment to reduce the pollution of waste salt and CN-containing poisons to water sources; use water-soluble synthetic quenching oil to replace part of quenching oil, and use biodegradable vegetable oil to replace part of mineral oil to reduce oil pollution. Precision heat treatment Precision heat treatment has two meanings: on the one hand, according to the use requirements, materials, and structural dimensions of the parts, using physical knowledge and advanced computer simulation and testing technology to optimize process parameters to achieve the required performance or maximum On the other hand, it is to fully ensure the stability of the optimized process, to achieve a small (or zero) product quality dispersion and zero heat treatment distortion. Energy-saving heat treatment Scientific production and energy management are the most potential factors for the effective use of energy. It is the choice of scientific management to establish a professional heat treatment plant to ensure full-load production and give full play to equipment capabilities. In terms of energy structure of heat treatment, primary energy is given priority; waste heat and waste heat are fully utilized; processes with low energy consumption and short cycle are adopted instead of processes with long cycle and high energy consumption. Less and no oxidation heat treatment is from the use of protective atmosphere heating instead of oxidizing atmosphere heating to controlled atmosphere heating with precise control of carbon potential and nitrogen potential. After heat treatment, the performance of parts is improved, and heat treatment defects such as decarburization and cracks are greatly reduced. The machining allowance is reduced, and the utilization rate of materials and machining efficiency are improved. Vacuum heating gas quenching, vacuum or low pressure carburizing, nitriding, nitrocarburizing and boronizing can significantly improve quality, reduce distortion and increase life.