Improved composite high-chromium iron-cast roller

A technology of high-chromium cast iron and rolls, which is applied in the field of improved composite high-chromium cast iron rolls, which can solve the problems of reduced surface quality of rolled strips, thermal cracks in the working layer of high-chromium cast iron, easy peeling of oxide film, etc., and achieve rolling output The effect of improving, increasing service life and reducing large inclusions

Active Publication Date: 2008-06-04
JIANGSU GONGCHANG ROLL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing composite high-chromium cast iron rolls not only produce thermal cracks in the high-chromium cast iron working layer, but also easily peel off the oxide film produced on the roll surface during the rolling process, so the existing composite high-chromium cast iron rolls have poor wear resistance. In addition, the peeling of the oxide film on the roll surface will also lead to a decrease in the surface quality of the rolled strip

Method used

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  • Improved composite high-chromium iron-cast roller
  • Improved composite high-chromium iron-cast roller

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: According to the composition of the high-chromium cast iron working layer, the proportioned pig iron, scrap steel and high-chromium cast iron are put back into the intermediate frequency furnace for smelting. After melting, the chemical composition of the original molten iron is analyzed, and then the corresponding alloy material is added. The composition obtained by melting is C2.6wt%, Si0.9wt%, Mn0.7wt%, Ni1.2wt%, Cr15wt%, Mo1.5wt%, V0.25wt%, W0.6wt%, N0.05wt%, Al0.1wt% %, P ≤ 0.04wt%, S ≤ 0.04wt%, the rest is molten iron in the working layer of iron and impurities, and the composite roll is centrifugally cast. The hardness of the working layer of the roll obtained by heat treatment is 78HSD, the tensile strength of the working layer is 830Mpa, and the hardness unevenness of the working layer is less than 2HSD. According to the rolling test, the grinding amount of each roll is less than 0.15mm, and the rolling amount of mm is 50% higher than that of the ...

Embodiment 2

[0015] Example 2: As in Example 1, the composition of the roll working layer is C2.8wt%, Si1.0wt%, Mn0.9wt%, Ni1.4wt%, Cr18wt%, Mo3.0wt%, V0.4wt%, W1.0wt% %, N0.07wt%, Al0.2wt%, P≤0.04wt%, S≤0.04wt%, and the rest are iron and impurities. After the heat treatment of the composite roll, the hardness of the working layer is 88HSD, the tensile strength of the working layer is 850Mpa, and the hardness unevenness of the working layer is less than 2.5HSD. According to the rolling test, the grinding amount of each roll is less than 0.15mm, and the rolling amount per millimeter is 60% higher than that of the original working layer made of high-chromium cast iron.

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Abstract

It is a type of complex high-chromium green roll with strong oxidation resistance and wearable property. Components of its working lining are as follows: 2.5-3.0% C,0.5-1.2% Si,0.6-1.2% Mn,1.0-1.5% Ni,12-20% Cr,0.5-3.5 % Mo,0.05-0.5% V,0.2-1.5% W,0.03-0.3% Al, 0.03-0.1% N ,P <=0.04%,S <=0.04%,iron and impurity the rest. Advantages of this kind of green roll are as follows: wear-resisting property was improved by 50% ,mm rolling quantity increased by 30%,its life-span and rolling output were doubled, draw resistent intensity was reinforced and rigidity asymmetry was lowered effectively.

Description

technical field [0001] The invention relates to the improvement of a hot-rolled steel strip composite high-chromium cast iron roll, in particular to a composite high-chromium cast iron roll with strong oxidation resistance and high wear resistance. Background technique [0002] Composite high-chromium cast iron rolls are used in the front section of the hot-rolled strip continuous rolling machine. During the rolling process, an oxide film will be formed on the roll surface. This oxide film has high strength and wear resistance, so it protects the roll surface and can Improve the wear resistance of the roll surface and reduce wear. However, the existing composite high-chromium cast iron rolls not only produce thermal cracks in the high-chromium cast iron working layer, but also easily peel off the oxide film produced on the roll surface during the rolling process. Therefore, the existing composite high-chromium cast iron rolls have poor wear resistance, and In addition, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/56
Inventor 张文君邵顺才步小平
Owner JIANGSU GONGCHANG ROLL
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