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Process for Electroslag Remelting Composite (Re)manufacturing Gradient Composite Layer Metal Roll

An electroslag remelting and composite layer technology is applied in the field of composite manufacturing and composite remanufacturing of metal rolls. and fusion metallurgical interface quality, reducing thermal damage, low production costs

Active Publication Date: 2022-07-29
朱龙华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the operation of electroslag remelting, due to the uneven current passing through the slag pool, the slag temperature fluctuates significantly: on the one hand, the surface of the roll is melted unevenly, resulting in uneven performance of the composite layer; on the other hand, the mandrel melts too much, not only As a result, a large amount of electrode rod alloy is diluted by the base metal, and a large amount of carbon in the mandrel base material (such as 92CrMo) will enter the molten pool, increasing the tendency of weld cracks; again, the mandrel is too much melted, resulting in overheating of the mandrel and reducing the mandrel. Mechanical properties, many aspects lead to quality problems of composite rolls

Method used

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  • Process for Electroslag Remelting Composite (Re)manufacturing Gradient Composite Layer Metal Roll

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The 92CrMo off-line cold-rolled backup roll with a diameter of Φ650mm×530mm was remanufactured by electroslag remelting and surfacing. The diameter of the off-line cold-rolled backup roller was Φ600mm.

[0040] 1.1 First, turn the fatigue layer and defects of the roll body. After turning to Φ580mm, through magnetic particle and ultrasonic nondestructive testing, no surface and internal defects were found, and the base material of the roll, namely the mandrel, was obtained.

[0041] 1.2 Select the appropriate alloy material, and its alloy composition is weighed according to the alloy content requirements designed in Table 1, and then the electric arc furnace EBT primary smelting, LF refining, and VD vacuum degassing are used for joint smelting.

[0042] 1.3 Select a tube mold with a diameter of Φ640mm, and cast the melted molten steel into a ring-shaped steel ingot (consumable electrode) with an outer diameter of Φ640mm and a thickness of 12mm. After the molten iron in ...

Embodiment 2

[0060] To make a 60CrMoV cold-rolled backup roll with a diameter of Φ450mm×460mm, the thickness of the hard surface layer on one side is required to be 80mm.

[0061] 2.1 A new roll blank with a roll surface length of Φ320mm × 540mm was produced, and the surface was turned at the same time to make a roll surface length of Φ290mm × 540mm.

[0062] 2.2 Select the appropriate alloy material, and the alloy composition is weighed according to the alloy content requirements designed in Table 2, and then the electric arc furnace EBT primary smelting, LF refining, and VD vacuum degassing are used for joint smelting.

[0063] 2.3 Select a tube mold with a diameter of Φ420mm, and cast the melted molten steel into a ring-shaped steel ingot (consumable electrode) with an outer diameter of Φ420mm and a thickness of 35mm. After the molten iron in the core is completely solidified, open the box, and directly put the ingot into a high-temperature annealing furnace preheated to 850°C for 6 hou...

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Abstract

The invention discloses a process for electroslag remelting composite (re)manufacturing a graded composite layer metal roll, which comprises the following steps: (1) preparing the base material of the roll to remove the fatigue layer and defects of the roll body; (2) selecting alloys respectively Making medium and high alloy pipe sleeves and low alloy or stainless steel pipe sleeves; (3) inserting low alloy or stainless steel pipe sleeves into the surface of the base material of the roll to make a roll core; (4) placing the roll core in a water-cooled crystallizer, Pour the molten electroslag remelted slag material into the crystallizer, put the consumable electrode on the outside of the roller core and insert it into the electroslag layer between the crystallizer and the roller core, and start the arc; (5) by pumping The ingot device continuously extracts the composite roll from the crystallizer; (6) removes the flat thin slag layer on the surface of the composite layer, puts it into a resistance furnace for tempering heat treatment, and then carries out machining, flaw detection and packaging. The process of the invention is simple, and the gradient composite layer with low impurity content, dense structure, no component segregation and no crack can be obtained.

Description

technical field [0001] The invention relates to a process for composite manufacturing and composite remanufacturing of gradient composite layer metal rolls using electroslag remelting welding technology, and belongs to the field of composite manufacturing and composite remanufacturing of metal rolls. Background technique [0002] Roller is one of the important components in steel production. Due to the influence of working conditions and environment, phenomena such as peeling, wear, block loss, sticking of steel, and weld bead marks often occur in the application of the machine, resulting in the failure of the roll. The composite (re)manufacturing treatment on the surface of the roll can significantly prolong the life of the roll and reduce the consumption of rolled steel. [0003] At present, there are many methods for composite (re)manufacturing of rolls. The main method is surfacing composite (re)manufacturing, but due to the slow surfacing speed of this method, one laye...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D19/16C21D1/18C21D1/30C21D6/00C21D9/38C21D9/40C22B9/18C22C38/02C22C38/04C22C38/22C22C38/24C22C38/26C22C38/38C22C38/46C22C38/58
CPCB22D19/16C22B9/18C21D1/18C21D9/38C21D6/004C21D6/005C21D6/008C21D6/002C21D1/30C21D9/40C22C38/04C22C38/02C22C38/002C22C38/46C22C38/38C22C38/24C22C38/22C22C38/58C22C38/26
Inventor 朱龙华王清宝吴银龙
Owner 朱龙华