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High-temperature wear-resistant alloy material for rolling mill guide and heat treatment method for rolling mill guide

A technology of high-temperature wear-resistant alloys and heat treatment methods, applied in heat treatment furnaces, heat treatment equipment, guide/positioning/alignment devices, etc., can solve the problems of guide material wear, frequent replacement, short life, etc., to eliminate internal stress, Effect of preventing crack initiation and improving service life

Active Publication Date: 2016-03-30
安徽东方新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention is to avoid the deficiencies in the above-mentioned prior art, and provides a high-temperature wear-resistant alloy material for rolling mill guides and a heat treatment method for rolling mill guides, so as to solve the problem of severe wear and short life of traditional guide materials during service. frequent replacement issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Chemical composition: C1.45wt%, Si1.2wt%, Mn0.8wt%, P≤0.03wt%, S≤0.03wt%, Cr11wt%, Ni0.6wt%, Mo0.1wt%, Cu0.2wt%.

[0067] Heat treatment process: heat at 200°C for 4 hours at a heating rate of 80°C / hour, cool in the furnace to room temperature; then heat with the furnace to 500°C for 4 hours; then heat at a heating rate of 110°C / hour to 960°C for 2 hours, air-cool to room temperature; followed by tempering at 440°C for 2 hours at a rate of 80°C / hour, air-cooled to room temperature; and finally at 270°C for 5 hours at a rate of 20°C / hour and then cooled to room temperature with the furnace.

[0068] Normal temperature performance test: microhardness: fine, dispersed, uniformly distributed carbides (Cr, Fe) in the matrix 7 C 3 The microhardness is HV1300~1520; the macrohardness: HRC60~62.5 on the working surface layer of the guide; the impact toughness: 11J / m 2 .

[0069] After testing, the average service life is: 3320 tons of steel.

Embodiment 2

[0071] Chemical composition: C1.5wt%, Si1.0wt%, Mn0.7wt%, P≤0.03wt%, S≤0.03wt%, Cr11.5wt%, Ni0.5wt%, Mo0.08wt%, Cu0.18wt%.

[0072] Heat treatment process: heat at 250°C for 5 hours at a heating rate of 70°C / hour, cool in the furnace to room temperature; then heat with the furnace to 550°C and hold for 4 hours; then heat at a heating rate of 100°C / hour to 1000°C for 2 hours, air-cool to room temperature; followed by tempering at 460°C for 2.5 hours at a rate of 90°C / hour, air-cooled to room temperature; and finally at 280°C for 5 hours at a rate of 18°C / hour and then cooled to room temperature with the furnace.

[0073] Normal temperature performance test: microhardness: carbide (Cr, Fe) in the matrix 7 C 3 The microhardness is HV1450~1600; the macrohardness: HRC62~63.5 on the working surface of the guide; the impact toughness: 10.8J / m 2 .

[0074] After testing, the average service life is: 3530 tons of steel.

Embodiment 3

[0076] Chemical composition: C1.55wt%, Si0.8wt%, Mn0.6wt%, P≤0.03wt%, S≤0.03wt%, Cr12wt%, Ni0.5wt%, Mo0.07wt%, Cu0.17wt%.

[0077] Heat treatment process: keep warm at 300°C for 6 hours at a heating rate of 60°C / hour, cool in the furnace to room temperature; then heat with the furnace to 600°C for 4 hours; Cool to room temperature; then temper at 480°C for 2.5 hours at a rate of 100°C / hour, and cool to room temperature in air; finally, heat at 290°C for 5 hours at a rate of 15°C / hour and cool to room temperature with the furnace.

[0078] Normal temperature performance test: microhardness: carbide (Cr, Fe) in the matrix 7 C 3 The microhardness is HV1500~1650; the macrohardness: HRC63~64 on the working surface of the guide; the impact toughness: 10.7J / m 2 .

[0079] After testing, the average service life is: 3760 tons of steel.

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Abstract

The invention discloses a high-temperature wearing-resistance alloy material for a rolling mill guide and guard unit and a rolling mill guide and guard unit thermal treatment method. The high-temperature wearing-resistance alloy material comprises the following components in percentage by mass: 1.45-1.6% of C, 11-12.5% of Cr and the balance of Fe, wherein the mass percent ratio of Cr to C is 7:8. The rolling mill guide and guard unit thermal treatment method comprises the following steps: firstly, performing low-temperature stress relief annealing on the rolling mill guide and guard unit of 200-300 DEG C, subsequently preheating at 500-600 DEG C, performing solution treatment at 960-1,050 DEG C, and finally performing high-temperature tempering at 440-480 DEG C and low-temperature tempering at 270-290 DEG C. The high-temperature wearing-resistance alloy material for the rolling mill guide and guard unit and the rolling mill guide and guard unit thermal treatment method disclosed by the invention have the advantages that high-temperature wearing resistance, high-temperature thermal strength and thermal stability of a guide and guard material are improved, the service life of the rolling mill guide and guard unit is prolonged by 3-4 times, and the like.

Description

technical field [0001] The invention belongs to the field of preparation and application of new materials, and in particular relates to a high-temperature wear-resistant alloy material for a rolling mill guide and a heat treatment method for the rolling mill guide. Background technique [0002] The guide is a device that enables the rolled steel piece to enter and exit the roll pass accurately and stably according to the predetermined direction and state during the section steel rolling process. It is one of the key equipment on the high-speed bar and wire rolling production line. Since the rolling guide replaced the sliding guide, the service life of the guide device, the surface quality of the product and the operating rate of the rolling mill have all been greatly improved. , so that the service life of the guide is short, the consumption is large, and the replacement is frequent, and it has become one of the bottlenecks restricting the production of steel products. The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/18C22C38/44B21B39/14C21D9/00
Inventor 徐庆云赵家柱吴鹏曹文明赵仕堂季方张有德郁应海王磊李益新
Owner 安徽东方新材料有限公司
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