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Product Description: 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.
Processing Technique
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.
Chemical composition and main mechanical properties of chromium alloy steel mill liners | |||||||||||
Grades | Chemical Composition | Hardness(HRC) | impact strength (J/cm²) | ||||||||
C | Si | Mn | Cr | Mo | Ni | Cu | S | P | |||
Cr15 | 1.5-4.5 | <1.5 | <1.5 | 10.0-18.0 | <3.0 | <1.5 | <1.2 | <0.06 | <0.1 | >56 | >5 |
Cr20 | 1.5-4.5 | <1.5 | <1.5 | 18.0-23.0 | <3.0 | <1.5 | <1.2 | <0.06 | <0.1 | >58 | >7 |
Cr26 | 1.5-4.5 | <1.5 | <1.5 | 23.0-28.0 | <3.0 | <1.5 | <1.2 | <0.06 | <0.1 | >58 | >7 |
Cr30 | 1.5-4.5 | <1.5 | <1.5 | 28.0-32.0 | <3.0 | <1.5 | <1.2 | <0.06 | <0.1 | >48 | >5 |