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High chromium alloy cast iron generally refers to the alloy white cast iron with the chromium content of 12% 30% and carbon content of 2.4% 3.6%. It is characterized by the microhardness hv1300 1800 of M7C3 eutectic carbide, which is dispersed on the matrix of martensite (the hardest structure in the metal matrix) in the form of a broken network and isolated shape, which reduces the splitting effect on the matrix. Therefore, the high chromium alloy liner has high strength, toughness, and high wear resistance, and its performance represents the highest level of metal wear-resistant materials. It has been widely used in large-scale cement ball mills abroad. The service life of the first bin is 6-8 years, and that of the second and third bin is more than 12 years.
In practical application, low carbon high chromium cast iron (steel) lining plate is generally used for the working condition with large impact load, and high carbon and high chromium cast iron lining plate is used for working condition with small impact load, so as to give full play to the wear resistance of the material. For example, Cr15 liner with 2.4% 2.65% C can be used for mills below 4.2m (one bin); Cr20 and Cr26 liners with 2.65% 2.85% C can be used for mills above 4.2m; when there is pre pulverizing system before grinding, such as roller press + cement mill, the average ball diameter is less than 60mm, and the C content can be higher, which can guarantee the service life (one bin) of 8-10 years, and the service life of bin 2 and 3 is longer. The grinding head plate can be made of medium (low) carbon high chromium cast iron; the discharge grate plate can be made of medium and high carbon high chromium cast iron; the partition board composed of blocks can be made of low carbon high chromium cast iron.
The chromium alloy steel mill liners produced by Qiming Machinery includes Cr13, Cr15, Cr20, and Cr26, which are used for more than 200 sets of ball mills with different specifications and models of 1.83M, 2.2M, 3M, 3.5m, 3.8m, 4.2m, 5M, and 5.4m. For example, The Cr15 mill liner has been used in the first bin of 2.2m 6.5m mill in Yanshi cement for 13 years; The Cr15 mill liner has been used in the first bin of 3m9m mill in Shunbao Cement for 7 years; In May 2020, the Cr26 mill liners and grinding head plate used on the 5.4m 15.5m super large mill of Dayu cement (Shandong) Co., Ltd. have been running continuously for more than 6 years. According to the customers report, the service life of the grinding head plate has exceeded 2 times of the original imported grinding head plate, and it is expected to be used for about 2 years.
When choosing high chromium cast iron material to prepare the mill liners, the production enterprise should give priority to its wear resistance, at the same time, it should also pay special attention to the combination of strength and toughness. Only when the organic matching of high strength, strong toughness, and high wear resistance can the excellent performance of high chromium cast iron to be brought into full play.
In order to improve the properties of high chromium cast iron, the fracture toughness KIC value of high chromium cast iron should be increased first. When CR > 13%, M7C3 eutectic carbides of high chromium cast iron can be broken and isolated. When the eutectic carbides remain unchanged and the CR / C ratio is between 6.6 and 7.1, the fracture toughness KIC value of high chromium cast iron is the highest, that is to say, the crack propagation resistance is the strongest. The results show that the morphology, distribution, and size of M7C3 eutectic carbides can be improved by high-temperature quenching or prolonging the holding time,
Increase toughness. The simplest and economical way to change the morphology, quantity, size and distribution of eutectic carbides in high chromium cast iron and improve its strength and toughness is to modify the molten iron, control its solidification, and more importantly, refine the eutectic carbide, reduce its splitting effect on the matrix, refine the matrix and improve the toughness.
Qiming Machinery is the leading manganese steel, chromium steel, alloy steel, and heat-resisting steel manufacturer in China. We manufacture crusher wear parts, shredder wear parts, mill liners, apron feeder pans, and other wear parts for customers.
Leading supplier of high alloy castings and forgings. There are 4 companies with sales of more than 100 million yuan, across the 4 major areas of wear resistance, heat resistance, corrosion resistance, and machinery
Cement Mill Liner for Shot Blast Machines, Chutes, Clinker Silo,Port Machinery and Ball Mills. This specification covers a group of white cast irons that have been alloyed to secure high resistance to abrasive wear in the applications of the mining, milling, earth-handling, and manufacturing industries. These alloys are made by melting process and shall have microstructures that consist of carbides, martensite, bainite, austenite, and in exceptional cases, minor amounts of graphite or pearlite. The following conditions for casting will be supplied: as-cast, as-cast and stress relieved, hardened, hardened and stress relieved, or softened for machining. Heat treatment shall be done. The chemical composition of a class and type (that is, Class I, Type A) shall conform to the range of values specified for carbon, manganese, silicon, nickel, chromium, molybdenum, copper, phosphorus, and sulfur. Hardness test shall also be made.