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Repair method of backup roll surface of steckel mill and special repair powder used thereon

A technology of a steel coil mill and a repair method, which is applied in the coating process and coating of metal materials, and can solve the problems of inapplicability of large support rolls, difficulty of large support rolls, difficulty in obtaining hardness, etc., and achieves fine grain size and short cycle time , the effect of tissue compaction

Inactive Publication Date: 2009-02-04
NANJING IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although surfacing welding is also a way of repairing, general surfacing welding needs to anneal the entire work roll surface before turning and surfacing welding, so the thermal stress is very large, and it is difficult to obtain the required hardness, and the overall heat treatment is often required , so it is difficult to popularize large support rolls, and it is not suitable for large support rolls with partial peeling of the roll surface

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] This embodiment is a method for repairing the surface of the backup roll of a Steckel mill, which includes the following steps:

[0015] (1) The worn or peeled parts of the support roller to be repaired are manually polished or machined to remove the cracks and fatigue layer, and reach a state suitable for laser repair, and then perform ultrasonic and staining flaw detection to ensure that the cracks and fatigue layer are completely removed;

[0016] (2) Preheat the support roll, the preheating temperature is 150°C, and the preheating heating rate is 3°C / h. ;

[0017] (3) Prepare the repair powder, the weight percentage of the ingredients in the repair powder is: C: 0.2%, Cr: 14%, Ni: 6%, Mo: 1%, W: 0.5%, Si: 1.5%, B: 2.0% , Fe: margin, the particle size of repairing powder is 50μ;

[0018] (4) The repair powder is used to cladding the area to be repaired layer by layer through a laser. Argon is used to protect the molten pool with inert gas during cladding. The output powe...

Embodiment 2

[0022] This embodiment is a method for repairing the surface of the backup roll of a Steckel mill, which includes the following steps:

[0023] (1) The worn or peeled parts of the support roller to be repaired are manually polished or machined to remove the cracks and fatigue layer, and reach a state suitable for laser repair, and then perform ultrasonic and staining flaw detection to ensure that the cracks and fatigue layer are completely removed;

[0024] (2) Preheat the support roll, the preheating temperature is 180℃, and the preheating heating rate is 4℃ / h;

[0025] (3) Prepare the repair powder, the weight percentage of the ingredients in the repair powder is: C: 0.3%, Cr: 16%, Ni: 8%, Mn: 0.5%, Mo: 1.5%, W: 1%, Si: 2% , B: 2.3%, Fe: balance, the particle size of the repairing powder is 80μ;

[0026] (4) The repair powder is used to cladding the area to be repaired layer by layer through a laser. Argon is used to protect the molten pool with inert gas during cladding. The ou...

Embodiment 3

[0030] This embodiment is a method for repairing the surface of the backup roll of a Steckel mill, which includes the following steps:

[0031] (1) The worn or peeled parts of the support roller to be repaired are manually polished or machined to remove the cracks and fatigue layer, and reach a state suitable for laser repair, and then perform ultrasonic and staining flaw detection to ensure that the cracks and fatigue layer are completely removed;

[0032] (2) Preheat the support roll, the preheating temperature is 200℃, and the preheating heating rate is 3.5℃ / h;

[0033] (3) Prepare repairing powder, the weight percentage of the repairing powder is: C: 0.4%, Cr: 18%, Ni: 10%, Mn: 1.2%, Mo: 2%, W: 2%, Si: 2% , B: 2.8%, Fe: balance, the particle size of the repairing powder is 120μ;

[0034] (4) The repair powder is used to cladding the area to be repaired layer by layer through a laser. Argon is used to protect the molten pool with inert gas during cladding. The output power of t...

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Abstract

The invention relates to a machinery part surface repairing method in the metallurgical industry, in particular to a repairing method of steekle mill supporting roller surface and specially used repairing powder; the repairing powder contains the components with the following weight percent: 0.2 percent to 0.5 percent of C, 14 percent to 20 percent of Cr, 6 percent to 12 percent of Ni, 0 percent to 1.5 percent of Mn, 1 percent to 2.5 percent of Mo, 0.5 percent to 2.5 percent of W, 1.5 percent to 2.5 percent of Si, 2.0 percent to 3.0 percent of B, and the rest is Fe. When a supporting roller cannot be used any more because the roller surface is worn or locally falls off, areas to be repaired are molten through a laser process with the repairing powder, so that the missing and damaged parts are repaired and the performance of the repaired parts can meet the use requirements; and then, the shape of the roller surface is recovered through mechanical processing, and a reusable supporting roller can be obtained without heat treatment.

Description

Technical field [0001] The invention relates to a method for repairing the surface of a mechanical device in the metallurgical industry, in particular to a method for repairing the surface of a support roll of a steckel rolling mill and its special repair powder. Background technique [0002] At present, there is no ideal way to repair the large support rolls of rolling mills after the roll surface is worn out, especially for local spalling, and they can only be left unused. Although surfacing welding is also a way to repair, the general surfacing welding needs to anneal the entire work roll surface before turning and surfacing, so the thermal stress is very large, and it is difficult to obtain the required hardness, and the overall heat treatment is often required. Therefore, it is difficult to popularize large supporting rollers, and it is not suitable for large supporting rollers with partial peeling of the roller surface. The metallurgical industry urgently needs a suitable r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10
Inventor 王道远丁定基王微斐党军梁江民张建国李文华蔡德明王兵
Owner NANJING IRON & STEEL CO LTD
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