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Classification method of cast iron rolls

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Classification method of cast iron rolls

  • Time of issue:2022-07-04 15:39

Classification method of cast iron rolls

  • Time of issue:2022-07-04 15:39
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Classification method of cast iron rolls

(1) Alloy chilled cast iron rolls Alloy chilled cast iron rolls can form a white layer by using the method of developing the supercooling degree of the molten iron itself and the cold surface, and whether the basic economic structure design of the working layer of the roll body is dissociated Graphite, the structure of metallographic analysis is fine pearlite and carbide, with high hardness and excellent wear resistance. Suitable for small bar, wire rod mills and narrow strip finishing mills.

(2) Alloy infinitely chilled cast iron roll (alloy infinitely chilled cast iron "roller") graphite is graphite evenly distributed in the matrix structure of the roll body. As the depth increases, the graphite content increases from the surface of the roll body inward , and the hardness decreases accordingly , so there is no obvious dividing line between the working layers. When the material of the cast iron roll contains high chromium, nickel, and molybdenum alloy elements, it is a high-nickel-chromium infinite chilled cast iron roll, which is produced by full flushing (overflow method). Or centrifugal compositecasting Process high nickel chromium infinite chilled cast iron roll has more carbides in the matrix structure of the working layer, which has high wear resistance. The existence of graphite in the matrix structure makes it have good thermal crack resistance, and is widely used in w ide , Medium and heavy plate mills and strip finishing mills.

(3) Alloy ductile iron passes through the roll. The roll is characterized by a uniform distribution of graphite from the roll body to the core in a spherical structure, so it has high tensile strength, can withstand heavy loads, and has good wear resistance . The matrix structure is carbide, pearlite or acicular bainite. Alloy nodular iron rolls can be roughly divided into pearlitic nodular iron rolls and bainite nodular iron rolls according to the structure of the roll matrix. Alloy ductile cast iron has good thermal shock resistance and wear resistance between rolls, and can be widely used as rolls in some large blooming mills, section steel mills, continuous bar mills and large seamless tube mills.

(4) Pearlitic nodular cast iron passes through the roll: add chromium, nickel, and molybdenum alloy design elements to the nodular cast iron and the roll, and the pearlitic nodular cast iron roll can be obtained by heat treatment of special materials. Pearlitic ductile iron has good strength, high temperature environment performance and accident resistance through rolling, and the hardness of the working layer decreases continuously.

( 5 ) In addition, nickel, manganese, chromium, molybdenum and other alloying elements are added to the acicular bainite Compared with the pearlite ductile iron roll, the acicular matrix (bainite + a small amount of martensite) It has higher strength, better toughness and significantly improved wear resistance. It can be produced by static casting and centrifugal casting enterprises, but the acicular bainitic ductile iron roll has high technical content and high casting stress, and the centrifugal composite material casting Chinese process can obtain an ideal comprehensive system performance.

(6) High-chromium composite cast iron rolls use wear-resistant high-chromium white iron containing 12% to 22% chromium as the outer layer material of the roll, and generally use ductile iron as the core and neck. roll. The material is a high-alloy composite cast iron roll produced by centrifugal composite casting process. Due to the presence of lath-like M7c3-type eutectic carbides, chrysanthemum-like M2c-type eutectic carbides and granular M23C6-type secondary carbides in different matrices, high-chromium composites use cast iron to pass between rolls and have excellent ant i-wear performance in China. It is widely used. It is used as rough rolling and finishing work rolls of hot strip mills, rough rolling and finishing work rolls of wide and medium plate mills, and finishing work rolls of small steel and medium plate mills.

 

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