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Improved composite high chromium steel roller and preparation process thereof

A high-chromium steel and roll technology, which is applied in the field of composite high-chromium steel rolls and the preparation of excellent metallurgical bonding, can solve the problems of reduced surface quality of rolled strips, reduced overall wear resistance of rolls, poor fatigue strength performance, etc. , to achieve the effect of reducing the amount of single grinding, prolonging the service life and high fatigue resistance

Active Publication Date: 2008-05-07
JIANGSU GONGCHANG ROLL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing high-chromium steel working layer still has the following deficiencies in actual use: 1. The hardness drop is large, thereby reducing the overall wear resistance of the roll; 2, the fatigue resistance performance is poor, causing the roll to easily produce cracks; 3. The corrosion ability is poor, the roll surface is easily corroded by certain media, and the roll surface is prone to roughness, resulting in a decrease in the surface quality of the rolled strip; 4. The thermal crack resistance is relatively poor, and the roll body is prone to cracks and / or peeling
Therefore, the overall service life of the existing high-chromium steel working layer composite roll is relatively short, and there is still room for improvement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: According to the composition of the high chromium steel working layer, the proportioned scrap steel and high chromium steel are returned to be smelted in an intermediate frequency furnace. After the melting, the chemical composition of the raw molten steel is analyzed, and then the corresponding alloy material is mixed to obtain the composition (Wt%): C1.63%, Si0.65%, Mn0.60%, Ni0.75%, Cr11%, Mo2.5%, V0.35%, N0.12%, B0.002%, Al0 .15%, P0.02%, S0.013%, the rest is molten steel in the working layer of iron and impurities. Vertical centrifugal casting composite roll, the working layer is poured when the molten steel of the working layer is 1455℃, when the interface temperature is 1270℃, when the temperature of the ductile iron is 1285℃, the 50mm ductile iron middle layer is poured. After the middle layer is partially solidified, The ductile iron core layer is poured at a temperature of 1304°C to obtain a composite roll. The hardness of the working layer of the roll ...

Embodiment 2

[0015] Embodiment 2: As in embodiment 1, the composition of the working layer of the roll is (Wt%): C1.68%, Si0.7%, Mn0.65%, Ni0.83%, Cr11.5%, Mo2.6%, V0 .4%, N0.14%, B0.0028%, Al0.17%, P0.0025%, S0.013%, the rest is molten steel in the working layer of iron and impurities. Vertical centrifugal casting composite roll, the working layer is poured when the molten steel of the working layer is 1450℃, when the interface temperature is 1268℃, when the temperature of the ductile iron is 1290℃, the 50mm ductile iron middle layer is poured. After the middle layer is partially solidified, When the temperature is 1310°C, the nodular iron core layer is poured to obtain a composite roll. The hardness of the working layer of the roll obtained by the heat treatment is 82HSD, and the hardness drop is less than 3HSD. After the rolling test, the overall service life of the roll is more than doubled.

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Abstract

This invention relates to the improvement of high chrome steel working lining of compound roller and its preparation method, the compound roller is used to casting hot band steel. The characteristic is the ingredient of the high chrome steel working lining, it is as follows: C0.8-2.0%, Si 0.5-1.2%, Mn0.4-1.5%, Ni0.4-1.5%, Cr8-16%, Mo 0.2-3.0%, V0.1-1.0%, N0.01-0.25%, B0.001-0.003%, Al0.01-0.3%, P<=0.03% and S<=0.03%, the other is Fe and some residual impurity, it adopts vertical centrifugal laminar casting. As to the existing high chrome roller, the compound high chrome roller has the superiorities, such as the fall of the working lining is less than 3HSD, the abradability of the roller can improve above 30%, and the yield of millimeter steel can improve around 33%. At the same time, the ability of corrosion resistant improves distinctly, the number of copping roller can decrease 20% at one time, and the working lining combines fine with the metallurgy of core, the lifetime of the roller can increase one time than existing one.

Description

Technical field [0001] The invention relates to an improvement of a composite roll with a high chromium steel working layer for hot-rolled strip steel and a preparation method thereof, and particularly relates to a working layer with good thermal crack resistance, small hardness drop, good wear resistance, and high fatigue strength , Composite high chromium steel roll with strong corrosion resistance and preparation method with excellent metallurgical bonding. Background technique [0002] At present, the composite high-chromium steel roll used in the front end of the hot-rolled strip continuous rolling machine, such as the high-chromium steel in the working layer of the roll as described in Chinese Patent 85102865, has a total composition range of C0.9-2.1% and Si0.2-0.6%. Mn0.3~0.8%, Ni0.5~1.5%, Cr6.0~19.0%, Mo0.5~2.0%, W≤2.0%, Co≤2.0%, and one or two of the following elements: Nb0.1 ~1.0%, V0.1~1.0%, Ti0.1~0.5%, Mg≤0.05%, the rest is iron. However, the existing high chromium s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/46B22D13/02
Inventor 张文君邵顺才步小平
Owner JIANGSU GONGCHANG ROLL
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