Surface overlaying method of foot roll of continuous casting machine

A surface surfacing and continuous casting machine technology, which is applied in the field of surfacing welding, can solve the problem of low pass rate of surfacing welding on the surface of continuous casting machine foot rolls, short service life of continuous casting machine foot rolls, thermal cracks in surfacing layers and welds, etc. problems, to achieve good toughness and wear resistance, reduce maintenance costs, and reduce thermal cracks in the surfacing layer and welds

Active Publication Date: 2015-08-12
MAANSHAN BAIYUAN MACHINERY CO LTD
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem is that when the submerged arc welding machine is working, the flux and the welding wire react with each other to generate a lot of heat, and the overlay layer will generate thermal stress at high temperature, resulting in thermal cracks in the overlay layer and weld seam, especially when the ventilation is not good. In a good factory building, the heat dissipation effect is even worse, and there are relatively more thermal cracks. Not only the pass rate of surfacing welding on the surface of the foot roll of the continuous casting machine is low, the rework rate of the product is high, the production cost increases, and the service life of the foot roll of the continuous casting machine is short

Method used

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  • Surface overlaying method of foot roll of continuous casting machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1 A continuous casting machine foot roll with a diameter of 20cm / inner diameter of 10cm was selected, and the surfacing was carried out according to the following steps:

[0026] 1) Pretreatment of continuous casting machine foot roll

[0027] Preheat and keep warm at 180°C for 3 h before welding.

[0028] 2) Soil preparation

[0029] a. Choose clean clay. The particle size ratio of the clay is: 0.05mm 20%, 0.005mm 30%, 1um 50%. After clay with different particle sizes is mixed with water, the mud mass formed has less gaps, which is conducive to the heat absorption of the soil and timely delivery;

[0030] b. According to the weight ratio of clay: water = 5:1, ensure that the clay is fully wet, which is convenient for filling in the foot roll of the continuous casting machine, and will not cause the soil to leave the inner surface of the roll during the surfacing rotation process due to too thin soil. Take the corresponding amount of clay and wate...

Embodiment 2

[0043] Example 2 The process was carried out in the same manner as in Example 1. The specific parameters are shown in Table 1. The performance test was performed on the foot roll of the continuous casting machine after surfacing, and the specific data were shown in Table 2 below.

Embodiment 3

[0044] Example 3 The process was carried out in the same manner as in Example 1. The specific parameters are shown in Table 1. The performance test of the foot roll of the continuous casting machine after surfacing was carried out. The specific data are shown in Table 2 below.

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Abstract

The invention, which belongs to the technical field of the overlaying, discloses a surface overlaying method of a foot roll of a continuous casting machine. The method comprises the following steps: (1), carrying out pretreatment of a foot roll of a continuous casting machine; (2), carrying out soil preparation; (3), carrying out soil filling; (4), carrying out surface overlaying; (5), removing the filling soil; (6), carrying out heat processing in a heating furnace under the temperature of 550 DEG C to 560 DEG C, carrying out heat preservation for 2 to 3 hours, and then drawing the processed member out of the furnace for cooling; and (7), carrying out rough machine at a tool and flaw detection, and then carrying out fine machine to enable the member to have the required dimension. The method has the following advantages: the steps of the method are linked in order and reasonably; and the operation process is simple and convenient. The surface of the foot roll of the continuous casting machine is flat and smooth; the flexibility and abrasive resistance are high; and the Rockwell hardness HRC can reach over 45. Hot cracks of an overlapping layer and a welding joint are reduced; the service life of the foot roll of the continuous casting machine is prolonged; the maintenance cost is lowered; the using effect of the continuous casting machine during billet production can be improved to the maximum extent; and the product quality can be guaranteed to meet the requirement.

Description

technical field [0001] The invention belongs to the technical field of surfacing welding, in particular to a method for surfacing welding on the surface of continuous casting machine foot rolls. Background technique [0002] The continuous casting machine foot roll with a composition of 42Cr has very harsh working conditions. It needs to bear the cyclic load caused by the bulging force and static pressure of the high-temperature steel billet at thousands of degrees Celsius. Bending deformation, there will be serious crack-like thermal fatigue cracks. When the depth or length of the crack exceeds the allowable limit value, it will suddenly become unstable and fracture during use and affect production. Therefore, submerged arc welding is used to The surfacing welding of the foot roll of the continuous casting machine can effectively improve the anti-fatigue and wear resistance and prolong its service life. At present, the hollow continuous casting machine foot roll is directl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/18B23K9/04B23K9/235
CPCB23K9/046B23K9/18B23K9/235
Inventor 马新欢
Owner MAANSHAN BAIYUAN MACHINERY CO LTD
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