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Repairing method for thin belt continuous casting crystallining roller

A technology of continuous casting crystallization and repair method, which is applied in the direction of non-electric welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of increasing the difficulty of repair work, achieve high repair efficiency, improve bonding force, and eliminate the adsorption oxygen layer Effect

Inactive Publication Date: 2006-06-07
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Increased difficulty of restoration work

Method used

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  • Repairing method for thin belt continuous casting crystallining roller
  • Repairing method for thin belt continuous casting crystallining roller
  • Repairing method for thin belt continuous casting crystallining roller

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) According to the surface wear of the crystallization roller and the design shape of the surface of the crystallization roller, determine the spraying thickness of each part on the surface, determine the amount of powder feeding during spraying and the spraying time of each area.

[0039] (2) Repair spraying: adopt the method of cold air power spraying, use compressed nitrogen to carry copper powder and spray on the surface of molten steel crystallization roller at supersonic speed, and repair the wear groove of crystallization roller. The particle diameter is 60-80μm.

[0040] Spraying pure Cu repair process: spraying distance 20mm, gas pressure 3.8-4MPa, gas temperature 200°C, gas flow rate 20g / s, metal powder impact speed 500m / s;

[0041](3) Repair inspection: check the size of the repaired surface after spraying, and the size is the same as the original design;

[0042] The structure of the cold air power spraying system is as follows: figure 1 As shown, the co...

Embodiment 2

[0047] The experimental procedure is the same as that of Example 1, except that the base material is steel. The selected material is BeZrNiCu, the particle diameter is 30-40μm, repair process: spraying distance 15mm, gas pressure 3.8MPa, gas temperature 600℃, gas flow rate 20-30g / s, metal powder impact speed 1100m / s.

[0048] Figure 5 The SEM topography of the BeZrNiCu coating is shown, and the interface between the substrate and the coating is marked by an arrow. It can be seen that the coating is uniform and dense, and the interface is not obvious in high-magnification microscopic observation, indicating that the BeZrNiCu coating is in close contact with the steel substrate, forming a good thermal conductivity surface repair layer. It plays the role of repairing and forming a new repairing surface.

Embodiment 3

[0050] The experimental procedure is the same as in Example 1. The selected material is CrZrCu alloy, the diameter of the particles is: 20-30μm, the repair process: spraying distance 20mm, metal powder impact speed 500m / s, gas pressure 2.5MPa, gas temperature room temperature, gas flow rate 30g / s;

[0051] Image 6 The SEM topography of the CrZrCu coating is shown, and the interface between the substrate and the coating is marked by an arrow. It can be seen that the coating is uniform and dense, and the interface is not obvious in high-magnification microscopic observation, indicating that the CrZrCu coating is in close contact with the Cu substrate, forming a good thermal conductivity surface repair layer. It plays the role of repairing and forming a new repairing surface.

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Abstract

The present invention relates to repair of thin belt continuous casting crystallizing roller, and is especially crystallizing roller surface repairing and regenerating technology. Cold aerodynamic spraying method is adopted, in which compressed gas carrying metal particle is made to bump the surface of the crystallizing roller in enough high speed so as to make the miniature metal particle produce sufficient deformation for adhering onto the surface of the crystallizing roller and to regenerate the outer surface of the crystallizing roller. The repairing coating and the crystallizing roller body contact closely and the homogeneous and compact coating constitutes the excellent surface heat conducting layer. The technological process of the present invention realizes the metal deposition at low temperature state without heat influence on the powder metal structure, re-crystallization of the base body and coating material, no adsorbed oxygen and no oxidation of metal powder.

Description

technical field [0001] The invention relates to the field of steelmaking and continuous casting, in particular to the technology for repairing crystal rolls in continuous casting of thin metal strips, and in particular to the technology for metal cold spraying and adhesion. Background technique [0002] The crystallization roll is one of the key components in the metal continuous casting and rolling machinery, especially the continuous casting of thin metal strips and thin plates. Its main function is to rapidly cool and solidify the molten metal into a strip blank with a certain solidification thickness. Rolled to form a cast strip billet. The basic principle is that the molten steel enters the molten pool composed of two counter-rotating crystallization rollers and side sealing plates through the flow distributor, and the liquid metal is rapidly cooled and solidified on the surface of the crystallization rollers to form a billet shell with a certain thickness. A thin stri...

Claims

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Application Information

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IPC IPC(8): B23K20/00
Inventor 张俊宝崔健方园宋洪伟
Owner BAOSHAN IRON & STEEL CO LTD
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