Preparation method of high-alloy centrifugal roller

A roll and alloy technology, applied in manufacturing tools, heat treatment equipment, furnace types, etc., can solve the problems of complex production process, high equipment requirements, low production efficiency, etc., achieve simple production process, low equipment requirements, and improve production efficiency Effect

Active Publication Date: 2018-06-05
SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The work rolls of hot-rolled strip mills are usually made of high-alloy working layers and ductile iron cores, which are manufactured by centrifugal compounding, and are often used in hot continuous rolling roughing stands and work rolls for rough and finish rolling of medium-width and thick plates. The alloy ratio of the working layer material is high. In order to meet the organizational performance requirements, high-temperature quenching treatment is generally required. High-temperature quenching has problems such as high equipment requirements, complex production processes, large energy consumption, and long production cycles. These all lead to high production costs and high production costs. low efficiency

Method used

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[0019] A method for preparing a high-alloy centrifugal roll. The high-alloy centrifugal roll includes a working layer and a core, wherein the material of the working layer is high-alloy hypereutectoid steel, and the chemical components and the mass percentages of each component are C≥ 1.0%, Cr+Ni+Mo+V+W≥12%.

[0020] Pour the molten steel in the working layer of the prepared roll into the centrifugal casting machine, fill in the molten steel in the core after a period of time, and then transfer it to the heat preservation pit, below the solidus temperature of the working layer material and above the temperature of the pearlite transformation zone Carry out temperature control and slow cooling so that the average cooling rate is ≤20°C / h; when the temperature drops to the temperature of the pearlite transformation zone of the working layer material, perform rapid cooling treatment, and the cooling rate in the temperature of the pearlite transformation zone reaches the temperature...

Embodiment 1

[0024] The invention discloses a preparation method of a high-alloy centrifugal roll. The high-alloy centrifugal roll includes a working layer and a core. The diameter of the roll body is 1200mm, the working layer is 50mm (radius), and the hardness requirement is 72-78HSD. The C content of the working layer of the design roll is 1.9-2.1%, and the Cr+Ni+Mo+V+W content is 18.5%.

[0025] Pour the molten steel in the working layer of the prepared roll into the centrifugal casting machine, fill in the molten steel in the core after a period of time, and test it with a thermal dilatometer. It is measured that the solidus line of the working layer material is about 1140 ° C, and the pearlite interval is about 740~620℃, the critical cooling rate is required to be 0.01℃ / s. Transfer the rolls to the heat preservation pit, and add a protective cover outside the rolls, so that the working rolls can be cooled slowly in the temperature range of 1140-740 ° C, so that the average cooling rat...

Embodiment 2

[0028] A preparation method of a high-alloy centrifugal roll. The high-alloy centrifugal roll includes a working layer and a core. The diameter of the roll body is 760mm, the working layer uses 40mm (radius), and the hardness requirement is 78-85HSD. The C content of the working layer of the design roll is 1.4-1.7%, and the Cr+Ni+Mo+V+W content is 13.5%.

[0029]Pour the molten steel in the working layer of the prepared roll into the centrifugal casting machine, fill in the molten steel in the core after a period of time, and test it with a thermal dilatometer. It is measured that the solidus of the working layer material is about 1150°C, and the pearlite interval is about 720~640℃, the critical cooling rate is required to be 0.02℃ / s. Transfer the rolls to the heat preservation pit, and add a protective cover outside the rolls, so that the working rolls can be cooled slowly in the temperature range of 1150-720 ° C, so that the average cooling rate is ≤ 20 ° C / h, after 16 hou...

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Abstract

The invention discloses a preparation method of a high-alloy centrifugal roller, and belongs to the field of preparation of rollers. The high-alloy centrifugal roller comprises a working layer and a core portion. The preparation method includes the steps: slowly cooling the rollers; rapidly reducing temperature; annealing at lower temperature. According to the method, solidification and cooling processes and annealing temperature and time of the rollers are reasonably controlled, high-temperature quenching of a preparation process of the high-alloy centrifugal roller is omitted, so that production processes are simplified, device investment is reduced, a production cycle is shortened, production cost is reduced, and the roller meets requirements and is stable in performance.

Description

technical field [0001] The invention relates to a preparation method of a centrifugal roll, in particular to a preparation method of a high-alloy centrifugal roll, and belongs to the field of roll preparation. Background technique [0002] The work rolls of hot-rolled strip mills are usually made of high-alloy working layers and ductile iron cores, which are manufactured by centrifugal compounding, and are often used in hot continuous rolling roughing stands and work rolls for rough and finish rolling of medium-width and thick plates. The alloy ratio of the working layer material is high. In order to meet the organizational performance requirements, high-temperature quenching treatment is generally required. High-temperature quenching has problems such as high equipment requirements, complex production processes, large energy consumption, and long production cycles. These all lead to high production costs and high production costs. low efficiency. Contents of the invention...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D13/02B22D19/16C21D1/26C21D9/38C22C38/56C22C38/44C22C38/46
CPCB22D13/02B22D19/16C21D1/26C21D9/38C21D2211/001C21D2211/004C21D2211/008C22C38/44C22C38/46C22C38/56
Inventor 肖泽扬
Owner SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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