The rebuilding of tube rolling mills

Utin, I. A.; Shandrenko, G. I.

doi:10.1007/bf00734598

Cited by 2 publications

(4 citation statements)

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“…As evidenced by literary sources [1][2][3][4][5][6][7][8][9]11] and practice, long-term operation of automotive parts in conditions of mechanochemical wear (mechanical friction) is accompanied by local damage (in the form of ulcers), which lead, as a rule, to loss of performance of the unit or device as a whole.…”

Section: Introductionmentioning

confidence: 99%

Technologies and materials for the renovation of erosion-worn parts of automobile equipment

Makarenko,

Maksimov,

Mieshkov

et al. 2023

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The article presents the results of the development of a technological method and equipment for the renovation of erosion-worn parts of automotive equipment. In the parts of machines and mechanisms subjected to mechanochemical wear, thin-sheet steel, the specific weight of which in car structures is on average 80%, is especially destroyed, as well as the working organs of machines: threaded joints, welding seams, internal friction surfaces (hubs, bearings, rollers and etc.). The solution to this problem is simplified when surface surfacing is used and it is possible to obtain a relatively flat surface with good separation of the slag crust without sharp height differences in the overlapping area.For welding wear-resistant and corrosion-resistant layers, it is necessary to use wires with a diameter of up to 2 mm, which allow applying thin layers of steel alloyed mainly with Cr, Ni, Mn, Mo during arc welding. The welding of such steels to ensure high quality of the deposited layers from the point of view of achieving high corrosion resistance is quite difficult. This is due to the fact that during the operation of welded parts and even when they are kept for a long time before operation, stripes with low corrosion resistance appear on the welded surface (dark colors on the polished surface of the working layer). In the process of developing the technology of surfacing the surface of worn parts, powders of ultra-fine particles were developed, which were used to fill the core of powder-coated wires with diameters of 1,6 and 2,2 mm. The composition of the charge included exotic additives, in particular chromium, molybdenum and complex liquid and alkaline earth ligatures, in particular yttrium and cerium, which made it possible to significantly increase the wear resistance of the deposited layer.

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Section: Introductionmentioning

confidence: 99%

Technologies and materials for the renovation of erosion-worn parts of automobile equipment

Makarenko,

Maksimov,

Mieshkov

et al. 2023

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“…A detailed analysis of scientific and practical information literature sources [1][2][3][4][5][6][7][8][9][10][11][12] shows that in most cases, mining and metallurgical equipment for a long period of operation is exposed to impact particles of the technological (working) environment, which usually causes erosion of the surface layers of the metal parts with the subsequent formation of microcracks, which as a result of growth lead to the destruction or depressurization of equipment, Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

“…Ukhtin and G.I. Shandrenko [2][3][4][5][6][7][8], the empty rollers of the center bodies of the piercing and running-in mills of pipe-rolling units and the running wheels of a special bridge crane are subjected to intensive wear. To extend the service life, the E.O.…”

Section: Introductionmentioning

confidence: 99%

“…It is known [1][2][3][4][5][6][7][8] that during operation, the rollers of roller conveyors and furnaces wear out, cracks and dents appear on the surfaces of the barrels of the rolls; there is their bending and breakage of necks and pins. Every year, for these reasons, more than 15% of rollers in rolling mills and more than 60% in pipe rolling shops fail out of the total number of rollers included in the equipment of these shops.…”

Section: Introductionmentioning

confidence: 99%

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Study of Durable Strength of Steel Mining and Metallurgical Equipment

Макаренко

Maksimov

Makarenko

et al. 2022

SSP

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Erosion of the metal of mining and metallurgical equipment due to the impact of solid particles is one of the forms of wear that can significantly limit the service life of a working machine or technological equipment, for example, a pipeline conveyor, loading and unloading bodies of mine workings and metallurgical machines. At present, this problem has been little studied and there is not enough information in the literature to form a systematic picture of impact erosion of equipment elements of mining and processing plants. The purpose of the research was to study the fatigue strength and corrosion-mechanical crack resistance of some structural elements of mining and metallurgical equipment with a long service life in chemically aggressive environments. Experimental tests for corrosion fatigue (long-term strength) were performed under bending load. The tests were performed on a bend with zero average voltage and a cycle frequency of 30 Hz. The tests were performed in salt solutions with a concentration of NaCl 5%. To compare the results, tests were sometimes performed in the air. The given data analysis shows that the long-term fatigue of the metal of mining and metallurgical equipment is significantly reduced when reaching 20 years of operation, especially in an aggressive environment containing chlorine ions, which causes severe corrosion damage to steel equipment. In addition, samples cut from metal with a long service life in mining and metallurgical conditions (more than 20 years) are characterized by low long-term strength. It has been found that fatigue resistance decreases with an increase in the number of cycles. Steel samples tested based on N = 106 and especially on the basis of N = 107 cycles have low resistance, which inevitably leads to breakdown with the subsequent destruction of equipment. It has been established that with an increase in the service life of the experimental mining and metallurgical equipment, the fracture toughness of the metal decreases significantly, which causes further failure and destruction of technological equipment.

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The rebuilding of tube rolling mills

Cited by 2 publications

References 0 publications

Technologies and materials for the renovation of erosion-worn parts of automobile equipment

Technologies and materials for the renovation of erosion-worn parts of automobile equipment

Study of Durable Strength of Steel Mining and Metallurgical Equipment

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