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A method for strengthening cast iron rolls

A cast iron roll and roll surface technology, which is applied in the strengthening field of cast iron rolls, can solve the problems of large heat input, incomplete strengthening, poor appearance, etc.

Active Publication Date: 2020-09-18
合肥九州龙腾科技成果转化有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Cast iron rolls that have only undergone traditional heat treatment have low roll surface hardness, short service life, and low steel passing capacity
Moreover, due to the particularity of the cast iron material, it is difficult to achieve its strengthening by traditional methods, such as traditional spray welding technology, plasma cladding and other technologies, because of their large heat input in the welding process, through them to strengthen the roll surface, often resulting in new rolls Cracks on the surface lead to the scrapping of the roll and failure to complete strengthening; however, the use of laser alloying technology can easily lead to extremely poor alloyed surface quality, a large number of pores and trachoma, and these defects directly affect the quality of steel products in production. Defective rolls make the surface of the rolled steel rough and poor in appearance, which affects the product delivery and product prices of steel companies

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Use absolute ethanol to clean the surface of the angle steel roll to remove impurities such as oil stains; degrease the surface of the angle steel roll; prepare the first alloy powder and the second alloy powder respectively, and the components of the first alloy powder are respectively according to mass percentage: C : 0.30%, Si: 0.95%, Cr: 5.05%, Mo: 1.35%, the balance is Fe, the particle size of the first alloy powder is 135-325 mesh; the components of the second alloy powder are respectively : C: 0.30%, Si: 0.95%, Cr: 5.05%, Mo: 1.35%, V: 0.93%, the balance is Fe, the particle size of the second alloy powder is 135 ~ 325 mesh; adopt coaxial powder feeding to cast iron The angle steel roll is subjected to the first laser cladding, and the first alloy layer is formed on the roll surface. The parameters of the first laser cladding are: the laser spot is a rectangular spot of 2×14mm, the scanning power is 3800W, and the scanning speed is 1000mm / min, the overlapping rat...

Embodiment 2

[0042] Use absolute ethanol to clean the surface of the angle steel roll to remove impurities such as oil stains; degrease the surface of the angle steel roll; prepare the first alloy powder and the second alloy powder respectively, and the components of the first alloy powder are respectively according to mass percentage: C : 0.35%, Si: 1.05%, Cr: 5.20%, Mo: 1.50%, the balance being Fe, the particle size of the first alloy powder is 135-325 mesh; the components of the second alloy powder are respectively : C: 0.35%, Si: 1.05%, Cr: 5.20%, Mo: 1.50%, V: 1.16%, the balance is Fe, the particle size of the second alloy powder is 135 ~ 325 mesh; adopt coaxial powder feeding to cast iron The angle steel roll is subjected to the first laser cladding, and the first alloy layer is formed on the roll surface. The parameters of the first laser cladding are: the laser spot is a rectangular spot of 2×14mm, the scanning power is 4000W, and the scanning speed is 1200mm / min, the overlap rate...

Embodiment 3

[0044] Use absolute ethanol to clean the surface of the angle steel roll to remove impurities such as oil stains; degrease the surface of the angle steel roll; prepare the first alloy powder and the second alloy powder respectively, and the components of the first alloy powder are respectively according to mass percentage: C : 0.30%, Si: 0.95%, Cr: 5.05%, Mo: 1.35%, the balance is Fe, the particle size of the first alloy powder is 135-325 mesh; the components of the second alloy powder are respectively : C: 0.35%, Si: 1.05%, Cr: 5.20%, Mo: 1.50%, V: 1.16%, the balance is Fe, the particle size of the second alloy powder is 135 ~ 325 mesh; adopt coaxial powder feeding to cast iron The angle steel roll is subjected to the first laser cladding, and the first alloy layer is formed on the roll surface. The parameters of the first laser cladding are: the laser spot is a rectangular spot of 2×14mm, the scanning power is 4000W, and the scanning speed is 1200mm / min, the overlap rate is...

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Abstract

The invention provides a reinforcing method of a cast iron milling roller and belongs to the technical field of metal surface treatment. The reinforcing method comprises the following steps that firstalloy powder is adopted for carrying out first laser cladding on the roller face of the cast iron milling roller, and a first alloy layer is formed on the roller face; and second alloy powder is adopted for carrying out second laser cladding on the first alloy layer, a second alloy layer is formed on the surface of the first alloy layer, and the reinforced cast iron milling roller is obtained. Bythe adoption of the method, by controlling the composition of the first alloy powder and the second alloy powder, the surface quality of the cast iron milling roller can be improved remarkably, the steel passing amount of the milling roller is increased, and the service life is prolonged.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to a method for strengthening cast iron rolls. Background technique [0002] In the process of steel rolling production, cast iron rolls often experience early wear and fatigue due to the special shape of the rolled steel, especially cast iron angle steel rolls, cast iron bar rolls, cast iron H-shaped rolls, etc., how to improve the cast iron rolls The amount of steel used and the service life have become the key factors restricting the cost per ton of steel for iron and steel enterprises. [0003] Cast iron rolls that have only undergone traditional heat treatment have low roll surface hardness, short service life, and low steel passing capacity. Moreover, due to the particularity of the cast iron material, it is difficult to achieve its strengthening by traditional methods, such as traditional spray welding technology, plasma cladding and other technologies, becau...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10C22C38/02C22C38/22C22C38/24
CPCC22C38/02C22C38/22C22C38/24C23C24/103
Inventor 付宇明张钰付晨郑丽娟
Owner 合肥九州龙腾科技成果转化有限公司
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