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Cobalt-based composite powder used for restoring rack of rolling mill and method for restoring rack of rolling mill

A technology of composite powder and repair method, applied in the direction of coating, metal material coating process, etc., can solve the problems of poor bonding ability of powder and repair frame, low powder utilization rate, long repair cycle, etc., to improve repair effect, The effect of high powder utilization and short repair cycle

Inactive Publication Date: 2014-05-28
马海鹏
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of this, the object of the present invention is to provide a cobalt-based composite powder for the repair of a steel rolling mill frame and its repair method, so as to at least solve the problem of poor bonding between the powder and the repair frame and the long repair period in the past frame repair. , low powder utilization rate, large energy consumption and other issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] It is prepared by mixing 25% chromium carbide and 75% cobalt-based powder by ball milling, wherein the particle diameter of chromium carbide is 100nm, and the cobalt-based powder is 0.8% by weight, Cr 25%, Si 0.3% , Mn 0.3%, W 8%, Fe 1.1%, Ni 10%, Co balance.

Embodiment 2~6

[0036] Embodiment 2~6, comparative example 1

[0037] The weight percentage of the raw materials used is shown in Table 1, and the preparation method also adopts ball milling and mixing.

[0038] Table 1

[0039] serial number Chromium carbide cobalt based powder Example 2 5% 95% Example 3 40% 60% Example 4 15% 85% Example 5 30% 70% Example 6 20% 80% Comparative example 1 0% 100%

[0040] See Table 2 for the weight percentage of each element in the cobalt-based powder.

[0041] Table 2

[0042] serial number C Cr Si mn W Fe Ni co Example 2 0.6% 30% 0.1% 0.1% 5% 3% 5% margin Example 3 0.8% 25% 0.4% 0.3% 8% 1.2% 8% margin Example 4 1% 20% 0.6% 0.5% 10% 0.5% 12% margin Example 5 0.8% 25% 0.3% 0.3% 8% 1.1% 10% margin Example 6 0.7% 22% 0.5% 0.4% 9% 0.7% 6% margin Comparative example 1 0.8% 25% 0.3% 0.3% 8% 1.1% 10% ...

Embodiment 7

[0044] The following uses the cobalt-based composite powder in Examples 1 to 6 to repair the rolling mill frame. The specific repair method is as follows: firstly, mechanically process the repaired surface of the rolling mill frame to remove surface oil stains and expose a fresh metal matrix; then Carry out non-destructive testing on the repaired surface to ensure zero defects; then, on the liftable working platform, the robot clamps the laser cladding head that can feed powder synchronously, and irradiates the high-power semiconductor laser beam coupled by the fiber to the repaired surface. The reciprocating laser cladding process is carried out through robot programming, and the composite powder in claim 1 is fused onto the base of the rolling mill frame to obtain a cladding layer with a grinding allowance of 0.2~1mm; finally, the surface of the cladding layer is machined Processing, to meet the requirements of dimensional accuracy and surface finish, the repair work is compl...

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Abstract

The invention provides cobalt-based composite powder used for restoring a rack of a rolling mill and a method for restoring the rack of the rolling mill. The composite powder is composed of, by weight, 5 percent to 40 percent of chromium carbide and the balance of the cobalt-based powder, and the cobalt-based powder is composed of, by weight, 0.6 percent to 1 percent of C, 20 percent to 30 percent of Cr, 0.1 percent to 0.6 percent of Si, 0.1 percent to 0.5 percent of Mn, 5 percent to 10 percent of W, 0.5 percent to 3 percent of Fe, 5 percent to 12 percent of Ni and the balance of Co. According to the preparing process, the restored surface of the rack of the rolling mill is machined; nondestructive testing is performed on the restored surface; high-power semiconductor laser beams output by an optical fiber coupling are irradiated to the restored surface, reciprocating laser cladding machining is performed through programming of a robot, the composite powder is sintered to the base body of the rack of the rolling mill, and a cladding layer is obtained; the surface of the cladding layer is machined to meet the requirements for size accuracy and cleanliness of the surface; the method has the advantages of being short in restoring cycle, high in powder utilization rate, low in energy consumption and the like.

Description

technical field [0001] The invention relates to material repairing, and in particular provides a cobalt-based composite powder for repairing a steel rolling mill frame and a repairing method thereof. Background technique [0002] The frame, commonly known as the archway, is the skeleton of the working stand of the rolling mill. It bears all the rolling force transmitted through the bearing seat and is subject to greater impact. Moreover, during the working process of the rolling mill, the rolling cooling water encounters the red-burning steel billet and rapidly atomizes, entraining the iron oxide powder falling off the surface of the billet and spraying it to the surroundings, so that the inner window surface of the rolling mill frame archway, the bottom surface of the rack archway, etc. There are different degrees of corrosion and wear, and the gap between the rolling mill stand and the roll bearing seat often exceeds the management limit. The working environment of the ro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00C23C24/10C22C19/07C22C30/00C22C32/00
Inventor 马海鹏
Owner 马海鹏
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