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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: 2010-06-02
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 back-up roll surface of a steckel mill, comprising the following steps:

[0015] (1) Use manual grinding or machining to remove the crack and fatigue layer on the worn or peeled part of the support roll to be repaired, and reach a state suitable for laser repair, and then conduct ultrasonic and coloring flaw detection to ensure that the crack and fatigue layer are completely removed;

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

[0017] (3) Modulate the repair powder, the weight percentage of the repair powder is: C: 0.2%, Cr: 14%, Ni: 6%, Mo: 1%, W: 0.5%, Si: 1.5%, B: 2.0% , Fe: balance, the particle size of the restoration powder is 50 μm;

[0018] (4) Use the repair powder to clad the parts to be repaired layer by layer through the laser. During cladding, use argon to protect the molten pool with inert gas. The output power of the laser is...

Embodiment 2

[0022] This embodiment is a method for repairing the back-up roll surface of a steckel mill, comprising the following steps:

[0023] (1) Use manual grinding or machining to remove the crack and fatigue layer on the worn or peeled part of the support roll to be repaired, and reach a state suitable for laser repair, and then conduct ultrasonic and coloring flaw detection to ensure that the crack and fatigue layer are completely removed;

[0024] (2) Preheating the support roller, the preheating temperature is 180°C, and the preheating heating rate is 4°C / h;

[0025] (3) Modulate the repairing powder, the weight percentage of the repairing 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 restoration powder is 80 μm;

[0026] (4) Use the repair powder to clad layer by layer the parts to be repaired by laser, and use argon gas to protect the molten pool with inert gas during cladding. The output power of the l...

Embodiment 3

[0030] This embodiment is a method for repairing the back-up roll surface of a steckel mill, comprising the following steps:

[0031] (1) Use manual grinding or machining to remove the crack and fatigue layer on the worn or peeled part of the support roll to be repaired, and reach a state suitable for laser repair, and then conduct ultrasonic and coloring flaw detection to ensure that the crack and fatigue layer are completely removed;

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

[0033] (3) Modulate the repair powder, the weight percentage of the composition of the repair 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 restoration powder is 120μm;

[0034] (4) Use the repair powder to clad layer by layer the parts to be repaired by laser, and use argon gas to protect the molten pool with inert gas during cladding. The output pow...

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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 partsare 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 back-up roll of a steckel mill and a special repair powder thereof. Background technique [0002] At present, there is no ideal repair method for the large back-up rolls of rolling mills after the roll surface wears out, especially for partial spalling, which cannot be repaired and can only be left idle. 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 back-up rolls, and it is not suitable for large-scale back-up rolls with partial peeling of the roll surface. The metallurgical industry urgentl...

Claims

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Application Information

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Patent Type & Authority Patents(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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