Low temperature annealing magnetic heat treatment process for low carbon steel magnetic parts
A low-temperature annealing technology for magnetic parts, which is applied in the field of low-carbon steel magnetic parts low-temperature annealing magnetic heat treatment process, to achieve good magnetic properties, optimize morphology, and improve magnetic properties
Active Publication Date: 2022-08-02
JIANGSU LONGCHENG PREC FORGING CO LTD
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At present, there is no spheroidization process for tertiary cementite
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[0026] In this process, the annealing temperature is 700°C, which is far lower than the 920°C annealing temperature of traditional magnetic heat treatment, and does not exceed the phase transition temperature of 727°C. The 11-14h annealing process is not only simple and easy to implement, but also can greatly reduce the heating temperature and process time, which is also beneficial to heat treatment equipment, and has outstanding advantages in energy saving and environmental protection. For the comparison of the process curves of the new process and the original process, see figure 1 shown.
[0027] After testing, when the intensity of the excitation magnetic field is 500A / m, the magnetic induction intensity of the low-temperature annealing process is about 1250mT, which is the same level as the original process. Microstructure of low carbon steel: comparison of flaky tertiary cementite before low temperature annealing and fracture spheroidized tertiary cementite after low te...
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The invention discloses a low-temperature annealing magnetic heat treatment process for low-carbon steel magnetic parts, including microstructure before annealing, annealing process experiment, and process detection. Layered pearlite. The low-temperature annealing of the present invention is aimed at the tertiary cementite, and the purpose is to optimize the morphology of the tertiary cementite, and has little effect on the mechanical properties. Ordinary spheroidizing annealing is aimed at secondary cementite, mainly to change the mechanical properties of carbon steel, soften its structure, reduce hardness, and prepare for subsequent cutting or deformation processes of materials. At present, there is no spheroidizing process for tertiary cementite. Annealing at this temperature will reduce the shielding area of the tertiary cementite to the magnetic circuit, thereby improving the magnetic properties of the low carbon steel. Compared with high temperature annealing, although the degree of perfection of grains after low temperature annealing is slightly worse, the optimized tertiary cementite morphology offsets this deficiency, so that the overall magnetic properties are still better.
Description
technical field [0001] The invention relates to the low-temperature annealing magnetic heat treatment technical field of low-carbon steel, in particular to a low-temperature annealing magnetic heat treatment process for low-carbon steel magnetic parts. Background technique [0002] Low carbon steel has slightly lower ferromagnetic properties than electrical pure iron, but still has good soft magnetic properties, and the cost of low carbon steel is lower than that of electrical pure iron, so it is still widely used as a soft magnetic material. The good magnetic properties of low carbon steel need to be reflected by magnetic heat treatment. A good heat treatment process can give low carbon steel parts enough magnetic properties to play a better role. The current magnetic heat treatment process of low carbon steel is similar to that of electrical pure iron, and it is generally emphasized that heat preservation at a higher temperature for a long time in order to obtain good magn...
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IPC IPC(8): C21D1/32
CPCC21D1/32C21D2211/003
Inventor 章建军汤晓峰庄晓伟杨程
Owner JIANGSU LONGCHENG PREC FORGING CO LTD