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Coating powder for submerged arc surfacing of low-carbon steel and application method thereof

A technology of submerged arc surfacing and application method, which is applied in the direction of arc welding equipment, welding medium, welding equipment, etc., and can solve the problem of interface cracks between the surfacing layer and the substrate, uneven distribution of hard phases, uneven surface of the wear-resistant layer, etc. problem, to achieve the effect of easy control of parameters, low labor intensity of workers, and reduction of the possibility of fracture and shedding

Active Publication Date: 2011-08-17
BIRTLEY TIANJIN IND EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of surface unevenness, uneven distribution of hard phase, and interface cracks between the surfacing layer and the substrate in the wear-resistant layer prepared by submerged arc surfacing in the prior art, resulting in the obtained wear-resistant layer being uneven. For the defects of beautiful appearance, low hardness, poor wear resistance, and low bonding strength, a coating powder for powder submerged arc surfacing welding on the surface of low carbon steel and its application method are provided, by spreading a certain thickness of alloy on the surface of low carbon steel Powder mixed with powder, followed by submerged arc surfacing process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A low-carbon steel plate with a thickness of 6mm (size specification: 300×200×6mm) is selected. Mix high-carbon ferrochrome, low-carbon ferrochrome, ferromanganese, and boron carbide powders with a particle size of 75um evenly. The composition is: C: 7%, Cr: 30%, Si: 0.15%, Mn: 1%, P: 0.01%, S: 0.01%, B: 2%, and the balance is Fe. Spread the powder evenly on the surface of the processed workpiece, the thickness is 4mm, the submerged arc surfacing current is 300A, the welding speed is 120mm / min, the diameter of the welding wire is 1.2mm, a small amount of graphite is added to the sintering flux SJ301 to facilitate slag removal, the welding torch swings from side to side, and the middle Stay for 0.1s, swing ±18mm. The surface of the obtained surfacing layer is smooth, evenly distributed filament-like stress release cracks, the macroscopic hardness can reach 56HRC, the microscopic rod-shaped chromium carbide reinforcement phase grows along the surface perpendicular to the...

Embodiment 2

[0033] A low-carbon steel plate with a thickness of 6mm (size specification: 300×200×6mm) is selected. Mix high-carbon ferrochrome, low-carbon ferrochrome, ferromanganese, and boron carbide powder evenly. The composition is: C: 14%, Cr: 65%, Si: 0.3%, Mn: 2%, P: 0.04%, S : 0.04%, B: 5%, and the balance is Fe. The powder particle size is 100um. Spread the powder evenly on the surface of the processed workpiece, the thickness is 6mm, the submerged arc surfacing current is 450A, the welding speed is 80mm / min, the diameter of the welding wire is 1.6mm, a small amount of graphite is added to the sintering flux SJ301 to facilitate slag removal, the welding torch swings from side to side, and the middle Stay for 0.1s, swing ±18mm. The surface of the obtained surfacing layer is smooth, evenly distributed filament-like stress release cracks, the macroscopic hardness can reach 62HRC, the microscopic rod-shaped chromium carbide reinforcement phase grows perpendicular to the surface of ...

Embodiment 3

[0035] A low-carbon steel plate with a thickness of 6mm (size specification: 300×200×6mm) is selected. Mix high-carbon ferrochrome, low-carbon ferrochrome, ferromanganese, and boron carbide powder evenly. The composition is: C: 8%, Cr: 40%, Si: 0.3%, Mn: 2%, P: 0.02%, S : 0.02%, B: 6%, and the balance is Fe. The powder particle size is 100um. Spread the powder evenly on the surface of the processed workpiece, the thickness is 6mm, the submerged arc surfacing welding current is 400A, the welding speed is 100mm / min, the diameter of the welding wire is 1.2mm, a small amount of graphite is added to the sintering flux SJ301 to facilitate slag removal, the welding torch swings from side to side, and the middle Stay for 0.1s, swing ±18mm. The surface of the obtained surfacing layer is smooth, evenly distributed filament-like stress release cracks, the macroscopic hardness can reach 60HRC, the microscopic rod-shaped chromium carbide grows along the surface perpendicular to the surfa...

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Abstract

The invention particularly relates to coating powder for submerged arc surfacing of low-carbon steel and an application method thereof. The coating powder contains C 7 wt% to 14 wt%, Cr 30 wt% to 65 wt%, Si 0.15 wt% to 3 wt%, Mn 1 wt% to 2 wt%, P 0.01 wt% to 0.04 wt%, S 0.01 wt% to 0.04 wt%, B 2 wt% to 6 wt%, and the balance of Fe. During the application, the coating powder is applied on the surface of a workpiece by 4 to 6 mm, and then the workpiece is subjected to submerged arc surfacing. The surfacing layer of the coating powder has high hardness, high resistance to abrasion and impact, and no cracks, impurities and pores, and filament-like stress releasing cracks generated on the surface of the surfacing layer can be prevented from dropping or stripping during the processing or application. Additionally, the process design of the coating powder is reasonable, and the parameters are easily controlled and the labor intensity is lower.

Description

technical field [0001] The invention belongs to the technical field of material surface modification, and in particular relates to a coating powder for powder submerged arc surfacing welding on the surface of low carbon steel and a use method thereof. Background technique [0002] The metal parts in various mechanical equipment and instruments are often damaged and invalidated from the surface firstly during use, and the products operate for a long time under harsh working conditions, which will inevitably put forward higher requirements for the strength and wear resistance of the surface . Low-carbon steel has a simple smelting process and low price, and is widely used in the production and preparation of engineering components. However, low carbon steel has low hardness and poor wear resistance, so it is generally not directly used as a wear-resistant material. The preparation of iron-based composite materials on the surface of low-carbon steel has the characteristics of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/24B23K9/18
Inventor 陈兵唐琳琳王盟
Owner BIRTLEY TIANJIN IND EQUIP
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