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Roll for hot-rolling apparatus and process for producing same

A manufacturing method and equipment technology, applied in the direction of rolls, metal rolling, manufacturing tools, etc., can solve the problems of low friction coefficient and difficulty on the surface of the spray coating, and achieve excellent corrosion resistance, great effect, and prolong the life of the roll.

Inactive Publication Date: 2013-04-03
TOCALO CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these rolls have a limit to the improvement of wear resistance in terms of roll performance. In addition, the friction coefficient of the surface of the sprayed layer related to the conveyance of the sheet material is low, and it is difficult to carry out smooth sheet passing.

Method used

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  • Roll for hot-rolling apparatus and process for producing same
  • Roll for hot-rolling apparatus and process for producing same
  • Roll for hot-rolling apparatus and process for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Using various steel materials with the composition shown in Table 1 with different Cr content and C equivalent Ceq the inside diameter of A ring-shaped test piece with a length of 100mm. Next, on the outer peripheral surface of the test piece, a Ni self-fluxing alloy mixed with 30% by mass of WC particles (WC-12Co sintered pulverized powder) with a particle size of 45 to 125 μm was sprayed using a powder flame spraying method to form a thickness of 3 mm. Self-fluxing alloy spray coating. However, for some test pieces, a hardfacing layer with a thickness of 10 mm was provided on the substrate before the self-fluxing alloy was sprayed, or a coating of only Ni self-fluxing alloy without WC particles was formed as a comparative example. Table 2 shows the self-fluxing alloys and hardfacing components used in the above coating formation.

[0067] Next, the test piece after the thermal spray coating was formed was subjected to a fusion treatment at 1000°C for 60 minutes i...

Embodiment 2

[0087] Collect 20 mmt * 100 mm * 100 mm flat plates from various steel materials shown in Table 1, and in the thermal spraying conditions shown in Table 3 of Example 1, after cooling or heat treatment, the thermal sprayed coating was not confirmed under the condition of cracks. One surface of the flat plate is coated with a thermal spray coating, and after fusion treatment, cooling or heat treatment is performed. Next, use a #400 diamond grinding wheel to grind the surface of the sprayed coating, then cut and grind the side and non-sprayed surface to prepare a plate-shaped abrasion test piece of 5mmt×50mm×50mm, which is specified in JIS H8503 Suga abrasion test.

[0088] The above-mentioned abrasion test was performed under the condition of pressing SiC#320 abrasive paper with a load of 32N and reciprocating 2000 times, and the abrasion resistance was evaluated from the mass change (weight loss) of the test piece before and after the test. As a result, the abrasion resistance...

Embodiment 3

[0091] Under the same treatment conditions as No. 11, which showed good results in the falling ball test of Example 1 and the wear test of Example 2, for the steel using C shown in Table 1 (Cr: 1.3% by mass, Ceq: 1.25 mass%) as the outer diameter of the roll raw material The outer peripheral surface of the roller is sprayed with Ni self-fluxing alloy containing WC. After forming a 3mm thick sprayed coating, it is fused and then cooled, so that the Shore hardness HS of the roller substrate is 45. The roller substrate and the self-fluxing The thickness of the diffusion layer of the molten alloy is 30 μm for a roll for hot rolling equipment. As a result of applying this roll to the outer coiling roll of the hot rolling coiling facility in the ironworks, the sinking of the roll surface due to the entry of the front end of the steel plate and the accompanying peeling off of the sprayed coating were greatly reduced, which determine the life of the roll. The main limitation is th...

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Abstract

A roll suitable for use in hot-rolling apparatuses is provided at low cost, the roll comprising a roll base which has a high hardness and is less apt to suffer deformation damages such as dents and a coating film formed on the surface of the roll base by thermal spraying, the coating film having excellent adhesion, wear resistance, and steel-sheet-conveying properties. Also provided is a process for advantageously producing the roll. The surface of a roll base comprising a steel which contains 0.9-3.2 mass% Cr and has a carbon equivalent Ceq, defined by equation (1), of 0.45-1.65 mass% is coated by thermal spraying with a coating film constituted of a self-fluxing alloy containing hard ceramic particles. Thereafter, the coated roll base is subjected to fusing treatment in a non-oxidizing atmosphere to form a diffusion layer having a thickness of 30-200 [mu]m between the coating film formed by thermal spraying and the roll base, and is then cooled or heat-treated. Thus, the roll base is made to have a hardness of 35-60 in terms of Shore hardness HS.

Description

technical field [0001] The present invention relates to a roll for a hot rolling facility and a method for producing the same, and more specifically, to use in a pinch roll, an outer coiling roll, and the like of a coiling facility for hot rolling (hereinafter, they are also collectively referred to as "rolls for a coiling facility") Roller excellent in impact damage resistance, thermal shock resistance, abrasion resistance, and steel plate passability, and manufacturing method thereof. Background technique [0002] Rolls for coiling equipment such as pinch rolls and outer coiling rolls (sometimes also called coiling rolls) used in hot-rolled coiling equipment enter the coiling equipment at high temperatures of 900 ° C to 500 ° C. Impact load caused by steel plate collision, sliding or temperature rise due to contact with the above-mentioned steel plate, or cooling or corrosion caused by cooling water, etc., are used in very harsh environments, so impact damage resistance, t...

Claims

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Application Information

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IPC IPC(8): C23C4/06B21C47/00B21C47/06C22C38/00C22C38/22C22C38/24C23C4/10C23C4/12C23C4/18C23C10/28C23C26/00
CPCC22C38/02B22F3/115C23C4/10C22C38/04B21C47/06C23C4/18C22C38/22C23C10/28B22F7/08C23C10/02C22C38/00B21B27/00B21C47/00C23C4/06C23C4/12
Inventor 安尾典之宫岛生欣洪明洙
Owner TOCALO CO LTD
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