Hypoeutectic high-chromium white cast iron roller and preparation method thereof

Abstract

The invention provides a hypoeutectic high-chromium white cast iron roller and a preparation method thereof. The roller is characterized by comprising a roller sleeve and a mandrel. The roller sleeve is composed of a roller body made of hypoeutectic high-chromium white cast iron and a seamless steel pipe lining, wherein the roller body comprises the following chemical components by mass: C 2.1 to 2.4%, Si 0.5 to 0.8%, Mn 0.3 to 0.5%, Cr 21 to 23%, Mo 1.2 to 1.5%, Ni 1.5 to 1.8%, B 0.3 to 0.6%, Ti 0.1 to 0.2%, W 0.2 to 0.3%, Nb 0.1 to 0.2%, V 0.2 to 0.3%, yttrium-based rare earth 0.3 to 0.5%, S <= 0.03% and P <= 0.03%, with the balance being Fe. The hypoeutectic high-chromium white cast iron roller provided by the invention has the advantages of good heat crack resistance, small hardness drop, good toughness and good wear resistance, and the rolling capacity of the roller is improved by 3 to 4 times compared with the rolling capacity of a centrifugal bainite composite roller.

Description

technical field [0001] The invention relates to a roll and a preparation method, in particular to a hypoeutectic high-chromium white cast iron roll and a preparation method. Background technique [0002] The roll is an important part used in steel rolling production, and the quality of the roll is directly related to the production efficiency of the rolling mill and the quality of the rolled product. At present, centrifugal bainite rolls are usually used in finished bar products and cutting frames. This type of roll has the following disadvantages in the long-term use process: 1. The hardness drop is large, and the first use of centrifugal bainite rolls and the last time With use, the material structure changes greatly, the hardness and wear resistance decrease rapidly, and the rolling tonnage can decrease by 50-70 tons; 2. The thermal fatigue resistance is poor, and the rolls work at high temperature for a long time, and the low thermal fatigue resistance of the rolls l...

AI Technical Summary

Problems solved by technology

At present, centrifugal bainite rolls are usually used in bar finished products and cutting frames. This kind of rolls has the following shortcomings in the long-term use process: 1. The hardness drop is large, and the first use of centrifugal bainite rolls and the last With use, the material structure changes greatly, the hardness and wear resistance decrease rapidly, and the rolling tonnage can decrease by 50-70 tons; 2. The thermal fatigue resistance is poor, and the rolls work at high temperature for a long time, and the low thermal fatigue resistance of the rolls leads to After being used for a period of time, it is easy to produce cracks and surface blocks, which seriously affect the quality of the rolled piece; 3. The centrifugal bainite roll has low toughness and high brittleness, and roll breakage occurs from time to time

The above problems lead to the short service life of centrifugal bainite rolls, which cannot meet the requirements of high-efficiency rolling mill production

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