Concrete pump concrete and asphalt concrete mixer. There are some parts that are resistant to abrasive wear in road construction machines such as stable soil mixers. These parts are generally subjected to light impact loads, have strong wear, have a short service life, and are frequently replaced. Road construction machinery manufacturers use nickel hard cast iron or high chromium cast iron to make such parts. We analyzed some domestic accessories and found that the hardness of the parts is low, for example; 1.20, 3 cubits. High chromium iron hardness only 1! Only the 0555 metallographic structure has a lot of retained austenite. The anti-wear potential of the material has not been fully exploited. In order to improve this situation, we conducted a cryogenic treatment experiment on the alloy white cast iron and achieved good results. The wear-resistant alloy cast iron contains chromium, nickel and molybdenum. Copper and other alloying elements, the carbon content of the matrix in the matrix, the final temperature of the transformation of the martensitic body (4) is much lower than the room temperature at which the martensitic transformation cannot be completed at room temperature, and a considerable amount of austenite remains in the quenched structure. Retained austenite not only reduces the hardness of the quenched workpiece, but also undergoes phase transitions at room temperature. The phase change stress will deform or even crack the workpiece. Therefore, in order to improve the wear resistance of the material, it is necessary to adopt technological measures to reduce the residual austenite as much as possible. After normal quenching, the matrix structure contains martensite and secondary carbides. The amount of austenite can reach 3 volumes and 4 grades, and the silver hard 4 cast irons are after subcritical treatment. In the base of the rest of the 5 to Yu. ! Seven Zhonghuo's Gongzhongzhuang cool down from the temperature range, and the amount of retained austenite to martensite will continue to decrease with temperature, and the hardness will increase. At the time of financial achievement, the martensitic transformation is basically completed. Therefore, the cryogenic treatment will have a significant effect in improving the hardness of the quenched alloy and improving the wear resistance of the material. First, the temperature measurement of high chromium cast iron and nickel hard cast iron specimens is performed in a laboratory cryogenic chamber. The test block size is 120,12,20, made of two materials high chromium cast iron test block chemical composition 1 milk 17. 0.7 0.70 along 0.92 01.8 commingled 8.12,1 test block after cryogenic treatment quenched high chromium cast iron or sub Critical treatment of nickel hard cast iron followed by cooling in a cryogenic chamber to 40, 81201 incubating at cryogenic temperature 20 1 The average cooling rate of the cooling curve test block was 1.7, and the cryogenic treatment significantly increased the hardness. The effect of nickel hard cast iron is even more pronounced. This is 7.2 Rockwell hardness units higher; the residual austenite rest in the nickel hard cast iron prior to cold treatment is more relevant; the test shows that the two materials have reached the highest hardness in the test when they are cryogenic to 80:00. The hardness of the specimens that are cryogenic to 12 and the hardness is not increased. The martensite is probably between 8512 and 1, but from the viewpoint of production cost, the refrigerant in industrial production needs to use a mixture of dry ice and alcohol. The cold temperature is about 80, or so. Therefore, no further cryogenic treatment between 8, 12, and 1 can be seen from scanning electron micrographs of 8 cryogenic specimens. The matrix is ​​mainly based on martensite microstructure. The average hardness of the specimen is similar to the macro hardness range. HRC Matrix Hardness Quenching The figures in the samples that have not been deep-frozen are hard cast iron determination data. The 16-person concrete mixer lining and the plant-stabilized soil mixing tablets are industrial test objects. These two types of components can basically reflect the materials under dry and wet grinding conditions. The test results show that cryogenic treatment significantly improves the wear resistance of high-chromium cast iron and nickel hard cast iron liners. 9 The service life of cryogenic treated mixes and liners is improved compared to the life of corresponding components without cryogenic treatment. 8 and 9 poles. The trial unit reflects that the life of the mixing tablet has reached the best level of domestically produced accessories, and the service life of the liner has surpassed the life of imported parts. The test samples installed on different parts of the same machine have different wear conditions and form a strong contrast. Cryogenic processing increases the production process. The total production cost is increased by about one, but due to a significant increase in service life, the use of The economic benefits brought by the unit are still considerable. 1 Hao Shijian. High-chromium wear-resistant cast iron 1 Beijing Coal Industry Press, 1993. 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