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Method for restoring roll body of steel casting roll of twin-roll strip casting

A repair method and casting roll technology, which is applied in the steel rolling field of the metallurgical industry, can solve problems such as roll body cracks, pits, increase production costs, and affect the service life of casting rolls, so as to prolong the service life, facilitate operation, and reduce production. cost effect

Inactive Publication Date: 2010-09-15
张子益 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the role of impurities and hard spots in the molten steel, defects such as cracks and pits will occur on the surface of the roll body during the use of the casting roll, which will affect the service life of the casting roll and increase the production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: The roll body size of a pair of casting rolls is ∮1200×600, The material is 35CrMo; repair according to the following steps:

[0015] 1. Clean and derust the roller body first and turn it to ∮1186-∮1188;

[0016] 2. Preheat the treated casting roll in the furnace at a temperature of 450°C;

[0017] 3. The preheated casting roll rotates slowly on the submerged arc surfacing machine, and at least three layers of welding wire are surfacing on the surface of the casting roll, and the rotational speed is 20m / h; the weight percentage of the chemical composition of the welding wire is as follows: C 0.8%, Cr 11.0%, Si 3.5%, B 4.0%, Mo 0.7%, Ni 80.0%; the flux for submerged arc surfacing is HJ431;

[0018] 4. After surfacing, annealing heat treatment is carried out, and the furnace is cooled to 180°C for release, the annealing temperature is 450°C, and the holding time is 10 hours;

[0019] 5. After annealing and heat treatment, the cast roll is cut to meet t...

Embodiment 2

[0020] Embodiment 2: the roll body size of a pair of casting rolls is ∮1200×6, The material is 35CrMo; repair according to the following steps:

[0021] 1. Clean and derust the roller body first and turn it to ∮1186-∮1188;

[0022] 2. Preheat the treated casting roll in the furnace at a temperature of 500°C

[0023] 3. The preheated casting roll rotates slowly on the submerged arc surfacing machine, and at least three layers of welding wire are surfacing on the surface of the casting roll, and the rotational speed is 21m / h; the weight percentage of the chemical composition of the welding wire is as follows: C 0.9%, Cr 12.0%, Si 4.0%, B 4.5%, Mo 1.1%, Ni 77.5%; the flux for submerged arc surfacing is HJ431;

[0024] 4. After surfacing, annealing heat treatment is carried out, and the furnace is cooled to 180°C for release, the annealing temperature is 500°C, and the holding time is 10 hours;

[0025] 5. After annealing and heat treatment, the cast roll is cut to meet the ...

Embodiment 3

[0026] Embodiment 3: the roll body size of a pair of casting rolls is ∮1200×600, The material is 35CrMo; repair according to the following steps:

[0027] 1. Clean and derust the roller body first and turn it to ∮1186-∮1188;

[0028] 2. Preheat the treated casting roll in the furnace at a temperature of 550°C;

[0029] 3. The preheated casting roll rotates slowly on the submerged arc surfacing machine, and at least three layers of welding wire are surfacing on the surface of the casting roll, and the rotation speed is 22m / h; the weight percentage of the chemical composition of the welding wire is as follows: C 1.0%, Cr 13.0%, Si 4.5%, B 5.0%, Mo 1.5%, Ni 75.0%; the flux for submerged arc surfacing is HJ266;

[0030] 4. Perform annealing heat treatment after surfacing, cool to 180°C with the furnace, annealing temperature is 550°C, and holding time is 10 hours;

[0031] 5. After annealing and heat treatment, the cast roll is cut to meet the required size and precision of ...

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Abstract

The invention discloses a method for restoring a roll body of a steel casting roll of twin-toll strip casting. The method comprises the following steps of: (1) clearing and turning the incomplete surface of the roll body of a casting roll to remove crackles and pits from the surface of the roll body of the casting roll; (2) preheating the treated casting roll in a furnace at the temperature of between 450 and 550 DEG C; (3) slowly rotating the preheated casting roll on a submerged arc welding machine at the rotating linear speed of between 15 and 40 m / h, and overlaying at least three layers of welding wires on the surface of the casting roll; (4) performing annealing thermal treatment on the casting roll after overlaying, cooling the casting roll to the temperature of 180 DEG C along with the furnace, wherein the annealing temperature is between 450 and 550 DEG C and the heat preservation time is 10 hours; and (5) cutting the roll body of the cast roll after the annealing thermal treatment to meet the requirements of a new roll on size and accuracy. The method of the invention has the characteristics of simplicity, convenient operation, prolonged service life of the casting roll, and reduction in production cost.

Description

technical field [0001] The invention relates to steel rolling technology in the metallurgical industry, in particular to a method for repairing the roll body of a steel casting roll for twin-roll casting and rolling thin strip steel. Background technique [0002] As we all know, twin-roll casting thin strip steel is an industrial new technology for producing thin strip steel. It flows high-temperature molten steel directly between a pair of relatively rotating casting rolls. The casting rolls are also called crystallization rolls. The molten steel flows from the two rolls The flow from top to bottom gradually crystallizes between them; at the same time, under the action of the rolling force of the twin rolls, the cast-rolled thin strip is produced from the gap of the twin rolls. However, due to the effect of impurities and hard spots in molten steel, defects such as cracks and pits will occur on the surface of the casting roll during use, which will affect the service life o...

Claims

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Application Information

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IPC IPC(8): B23P6/00
Inventor 张玉良
Owner 张子益
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