Laser cladding repair method for breast roll

A technology of laser cladding and repairing method, which is applied in the direction of coating, metal material coating process, etc., can solve problems that cannot be used to repair rack rolls, difficult solutions, etc., to reduce impact, reduce accidents, and ensure rolling The effect of line elevation

Inactive Publication Date: 2019-05-07
鞍山大陆激光技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The stand roller is different from the conveying roller table and the steel transfer roller table. Its working position is on the rolling frame and participates in the rolling process. In addition to wear and oxidation corrosion, it also bears high temperature and high pressure water erosion and strong impact of steel billets , the above-mentioned working environment causes the technologies disclosed in patent numbers CN201220494087.9 and CN201410393338.8 to be unable to be used for repairing rack rollers
[0007] At present, it is difficult to have an effective solution, so most of the steel mills adopt the direct scrapping method for the off-line rack rolls

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: The first repair of the finishing stand rolls of Minmetals Ying Steel Heavy Plate Plant, the process flow:

[0031] (1) Carry out turning processing on the rack roller with the shape of wear to remove the fatigue layer;

[0032] (2) Carry out coloring flaw detection on the frame roller, there is no crack on the surface, and carry out ultrasonic flaw detection according to JB / 75000.15-2007 standard, with a sensitivity of Ø3, qualified;

[0033] (3) Flame heating and preheating above 150°C, use 08A welding wire to surfacing to an outer diameter of 602mm, and the hardness after welding is HB260-270;

[0034] (4) Slow cooling and annealing at 570°C for 8 hours to remove welding stress;

[0035] (5) Turning on a lathe to a diameter of 598mm;

[0036] (6) Carry out coloring flaw detection and ultrasonic flaw detection, and the flaw detection is qualified;

[0037] (7) Configure laser cladding powder. The cladding layer should have the characteristics of impact r...

Embodiment 2

[0051] Example 2: Secondary repair of the roughing stand rolls of Minmetals Ying Steel Heavy Plate Plant, the process flow:

[0052] (1) Turning on a lathe to a diameter of 597.8mm;

[0053] (2) Carry out colored flaw detection and ultrasonic flaw detection, and the flaw detection is qualified;

[0054] (3) Configure laser cladding powder. The cladding layer should have the characteristics of impact resistance, wear resistance, corrosion resistance, and high temperature resistance. The chemical composition weight percentage: silicon 1.3%, chromium 29%, nickel 19%, manganese 0.32%, Vanadium 1.9%, molybdenum 5.2%, tungsten 6.2%, yttrium 0.12%, the rest is iron and unavoidable impurities, the powder particle size is 53-150μm;

[0055] (4) Formulate a reasonable laser cladding process, the process parameters are:

[0056] Focus lens f= 400mm,

[0057] Cladding power P=4000W,

[0058] Spot diameter D=3.2mm,

[0059] Cladding line speed V=800mm / min,

[0060] 50% overlap rate, ...

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PUM

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Abstract

The invention discloses a laser cladding repair method for a breast roll. The laser cladding repair method comprises the following steps of removing a fatigue layer, performing overlaying to restore the size, performing annealing, performing outer diameter turning, performing low carbon overlaying, performing preheating, performing laser cladding, performing slow cooling and performing argon arc welding repair. For re-repairing, it is presented that re-repairing is performed when a laser cladding layer is worn away by 0.8-1.2 mm; and according to the laser cladding repair method, the repair ofthe breast roll is realized, meanwhile, the requirements for impact resistance, wear resistance, oxidation corrosion resistance, high temperature resistance and high-pressure water erosion resistanceof the breast roll are met, and the service life reaches 2 years or more.

Description

technical field [0001] The invention relates to the technical field of laser cladding, in particular to a laser cladding repair method for rack rolls. Background technique [0002] A large number of roller tables are used in the metallurgical and steel rolling industry, among which several independently driven working roller tables installed on the rack are called rack rolls. The main function is to reliably convey the rolled piece, and smoothly realize the biting and throwing of the steel. Rack rolls are important components of steel rolling equipment, and are subjected to harsh environments such as high temperature, oxidation corrosion, rapid and strong impact of steel billets, friction and wear of steel billets, and high-pressure water erosion. [0003] For example: the five-meter thick plate rolling mill online stand roll has been used for a long time, and the wear amount is as high as 20mm, or even 30~40mm. Since its material is 34CrNiMo6, its carbon content is relati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C22C38/02C22C38/04C22C38/44C22C38/46
Inventor 崔忠宝尚旭
Owner 鞍山大陆激光技术有限公司
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