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Roll ring for reducing unit and sizing unit of bar rolling mill and preparation method of roll ring

A bar rolling mill, reduction and sizing technology, applied in the direction of rolls, metal rolling, metal rolling, etc., can solve the problems of high cost, complex production process of roll rings, etc., achieve low cost, ensure uniform structure, and reduce thermal stress evenly distributed effect

Active Publication Date: 2020-05-12
SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, tungsten carbide roll rings are mostly used in reducing and sizing units. The production process of this kind of roll rings is complicated and the cost is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0028] A method for preparing a roll ring for a bar mill reducing and sizing unit comprises the following steps:

[0029] In step a, the high-alloy molten steel for the outer layer of the roll ring and the low-alloy molten steel for the inner layer of the roll ring are respectively melted in an intermediate frequency furnace.

[0030] Step b, after the smelting is completed, both the high-alloy molten steel in the outer layer of the roll ring and the low-alloy molten steel in the inner layer of the roll ring are raised to above 1600°C, and are ready to be released from the furnace; After 10 minutes, the low-alloy molten steel in the inner layer of the roll ring is discharged.

[0031] Step c, calculate the amount of molten steel poured into the outer layer and inner layer of the roller ring according to the thickness of the working layer used by the roller ring, and use the centrifugal pouring method to sequentially pour the melted outer layer molten steel and inner layer molt...

Embodiment 1

[0042]A roll ring for a reduction and sizing unit of a bar mill, characterized in that it includes an outer layer of the roll ring and an inner layer of the roll ring prepared by a centrifugal casting method, the chemical composition of the outer layer of the roll ring and the weight percent of each component The content is: C 1.50~2.20%, Si 0.20~1.00%, Mn 0.20~1.00%, P≤0.03%, S≤0.03%, Cr 3.00~8.00%, Ni 0.30~1.50%, Mo 3.00~8.00%, V 2.00~8.00%, W 2.00~8.00%, the rest is Fe and unavoidable impurities, the chemical composition of the inner layer of the roller ring and the weight percentage of each component are: C 1.50~2.00%, Si 0.60~1.80%, Mn 0.20~1.00%, P≤0.03%, S≤0.03%, the rest is Fe and unavoidable impurities.

[0043] A method for preparing a roll ring for a bar mill reducing and sizing unit comprises the following steps:

[0044] In step a, the high-alloy molten steel for the outer layer of the roll ring and the low-alloy molten steel for the inner layer of the roll ring ...

Embodiment 2

[0059] A roll ring for a reduction and sizing unit of a bar mill, characterized in that it includes an outer layer of the roll ring and an inner layer of the roll ring prepared by a centrifugal casting method, the chemical composition of the outer layer of the roll ring and the weight percent of each component The content is: C 1.50~2.20%, Si 0.20~1.00%, Mn 0.20~1.00%, P≤0.03%, S≤0.03%, Cr 3.00~8.00%, Ni 0.30~1.50%, Mo 3.00~8.00%, V 2.00~8.00%, W 2.00~8.00%, the rest is Fe and unavoidable impurities, the chemical composition of the inner layer of the roller ring and the weight percentage of each component are: C 1.50~2.00%, Si 0.60~1.80%, Mn 0.20~1.00%, P≤0.03%, S≤0.03%, the rest is Fe and unavoidable impurities.

[0060] A method for preparing a roll ring for a bar mill reducing and sizing unit comprises the following steps:

[0061] In step a, the high-alloy molten steel for the outer layer of the roll ring and the low-alloy molten steel for the inner layer of the roll ring...

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Abstract

The invention discloses a roll ring for a reducing unit and a sizing unit of a bar rolling mill and a preparation method of the roll ring, and belongs to the field of casting. The roll ring comprisesa roll ring outer-layer and a roll ring inner-layer. The preparation method comprises the steps that a horizontal centrifuge is used for production, a two-layer composite method is used, that is, theouter layer is high hardness and high abrasion resistance alloy material, the inner layer is low hardness and high toughness cast steel material, and through the design and adjustment of reasonable casting parameters, the outer layer and the inner layer are fused. After unpacking, the rough roll ring is subjected to annealing and de-stressing. Rough machining is carried out, after the test is passed, a special heat treatment process is adopted to control the hardness of the roll ring to meet the requirements, and the rough roll ring is subjected to finish machining to form the finished product.

Description

technical field [0001] The invention relates to the field of casting, in particular to a method for preparing a roll ring. Background technique [0002] The reducing and sizing unit of the bar mill has a reducing pass with a reduction of more than 20% and a sizing pass with a lower reduction of 6%-16%, and all passes have pass patterns. As the finishing rolling unit of the bar rolling mill, it is mainly for the precise control rolling of special (alloy) steel, and to improve the surface quality and dimensional accuracy of the finished product. The reducing and sizing units are generally used when rolling special steel bars, so the roll rings used in this equipment are required to have high wear resistance and accident resistance. At present, tungsten carbide roller rings are mostly used in reducing and sizing units. The production process of this kind of roller rings is complicated and the cost is high. Contents of the invention [0003] The technical problem to be solve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D19/16B21B27/00B22D13/02C22C38/02C22C38/04C22C38/44C22C38/46C21D9/38C21D1/30
CPCB22D13/02B22D19/16B21B27/00C22C38/02C22C38/04C22C38/44C22C38/46C21D9/38C21D1/30
Inventor 马大江李晓刚史梦健董亮贺振轩
Owner SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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