Characteristics of rare earth carburizing. We use 20CrMnTi steel as experimental material to conduct systematic experimental research on the application of rare earth carburizing process in well furnace. It is found that rare earth carburizing has the following characteristics: 20CrMnTi steel in well furnace, with the extension of strong osmosis time The depth of the infiltration layer is thickened and the surface microhardness is increased. When the effect of stable permeation is reached, it can reach 960HV. The soil element improves the microstructure of the layer, carbide, retained austenite and martensite structure are better than the original process. There is a large reduction. Low temperature rare earth carburizing has a positive effect on improving microstructure and controlling deformation, and is an ideal process. The thickening of the rare earth carburized layer and the time of strong osmosis are approximately linear. Rare earth carburizing has an outstanding contribution to energy saving, productivity and productivity, and has certain application value.
The practical application value of rare earth carburizing Through experimental research, we found that the rare earth carburizing process is put into production, and the following technical and economic effects can be obtained: the productivity can be increased by 21-33%, and the corresponding power consumption is saved. The economic benefits that can be brought about by electricity saving are approximated as follows: a. Comparison calculation method of single consumption: check the record of the previous carburizing furnace, the unit consumption of the heat-treated workpiece, that is, the heat consumption per ton of heat treatment, to the 4# well furnace The calculation is as follows: The unit consumption of 4# furnace in April is 1076.95kwh/t, and the electricity consumption of rare earth carburizing trial production starts at 15:30 on May 31 (the workpiece is put into the furnace) until 3 o'clock on May 6 (Working out of the furnace), a total of 114.5h, processing 6640kg of workpiece, the total power consumption is 4460kwh, unit consumption Q=4460/6640=671.69kwh/t. Power saving rate n=(1076.95-671.69)/1076.95=37.6%b Calculation method: No matter the original process or the new process of rare earth carburizing, the process is divided into three stages: heating exhaust, strong sand and diffusion. The fixtures used are exactly the same in production and loading. The new process energy saving is mainly manifested in the strong seepage time. However, the cooling and diffusion basically consumes no electricity, so the new process power saving rate n=(△hl_△h2)/△hl×100%△h1=the average process occupies the furnace time-2h△h2=the rare earth carburizing The process averages 2 hours of furnace time for the group of δ=1.0-1.4mm, △h1=8.33-2 =6.33△h2=6.83-2=4.83nl=(6.33-4.83)/6.33=23.5% for the group of δ=1.2-1.6mm, △h1=9.93-2=7.93△h2=7.73-2=5.73n2 = (7.93-5.73) / 7.93 = 27.7% Comparison of the two methods, the second is the ideal value, that is, does not include additional power consumption such as furnace temperature rise, air furnace insulation, and return process; the first one reflects the actual production . It can be seen from the above calculation that the rare earth carburizing process can not only improve the productivity, but also save electricity by 23.5 to 27.7%.
Economic benefits from electricity saving: In April, the power consumption of 4# furnace was 28360kwh/t, which was half of the products in the deep and shallow layers, and the power saving rate was 25%. The power consumption of the furnace was W=28360×0.25=7090kwh. The furnace works for 10 months every year, and the electricity price per kwh is 0.5 yuan. The annual electricity saving fee for each furnace is F=7090×10×0.5=35450 yuan. The workshop is calculated according to the routine 6 furnaces, which can save about 217,500 yuan per year. For shallow products with δ=0.6-1.2mm, the rare earth carburizing at 860 °C not only simplifies the operation, shortens the furnace time, but also reduces the deformation, avoids repair and further improves the product quality. Practice has proved that the addition of rare earth in the infiltrant can not only improve the carburizing speed, but also change the morphology and distribution of the carbide, and play a role in the infiltration and microalloying of the carburizing process.
General Purpose Masking Tape,White Masking Tape,Yellow Masking Tape,Wall Painting Tape
Shenzhen An Bi Chang Packaging Material Co.,Ltd. , https://www.szabctape.com