Technology for repairing roll by high-temperature molten-steel spray deposition based on thermit reaction

Abstract

The invention discloses a technology for repairing a roll by high-temperature molten-steel spray deposition based on thermit reaction. The technology is characterized in that the thermit reaction and the spray deposition technology are combined, alloy liquid produced by the thermit reaction is directly deposited on the surface of the roll to be repaired by adopting a spray-deposition process, the initial deposition layer is remolten on the surface of the roll by adjusting the gas liquid ratio and the deposition height, so that a high-alloy deposition layer metallurgically bonded with the roll is formed. The roll repaired by utilizing the technology has the advantages that the wear resistance of the roll is improved, the service life of the roll is prolonged and the production cost of the steel rolling industry is greatly reduced.

Description

technical field [0001] The invention relates to a roll repair technology, in particular to a roll repair technology based on aluminothermic reaction-based spray deposition of high-temperature molten steel. Background technique [0002] As an important tool in the steel rolling industry, rolls are the most important consumption parts of steel rolling equipment. With the increase of steel production, the consumption of rolls increases rapidly. The roll loss rate of large-scale iron and steel enterprises in my country is about 0.8-1.1 kg / ton, while the roll consumption of a large number of private enterprises in the narrow-band and wide-band single-stand mills is 1-2 kg / ton, such as cold-rolled work rolls at 1.2 kg / ton steel Roll loss is calculated based on output. In 2010, only cold-rolled plates need to consume 64,000 tons of rolls. In order to adapt to the growth of thin strips, the annual demand for forged steel rolls will increase at a rate of more than 20%. With the impr...

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Problems solved by technology

The surfacing repair technology is complicated in process, low in productivity, and not too high in hardness. The roll is prone to cracks, slag inclusions, welding spots and shedding during surfacing; the disadvantage of thermal spraying repair technology is that the bonding strength between the coating and the base material is low (25MPa ~80MPa), because the bonding mechanism is mainly mechanical bonding, so the coating has problems such as pores and residual stress, poor toughness, and poor machinability; the disadvantage of thermal spray welding repair technology is that the thermal spray welding material must be consistent with the base material Matching, the range of spray welding material and base material is much narrower than that of thermal spraying, and the deformation of the base material in the thermal spray welding process is much larger than that of thermal spraying

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