High-carbon martensitic stainless steel for mill guide roller and heat treatment method of mill guide roller

A heat treatment method and carbon martensite technology, applied in heat treatment furnaces, heat treatment equipment, furnace types, etc., can solve the problems of frequent replacement, short life, wear of guide roller materials, etc.

Inactive Publication Date: 2016-11-09
HEFEI ORIENT METALLURGICAL EQUIP
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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 shortcomings in the above-mentioned prior art, and provides a high-carbon martensitic stainless steel for rolling mill guide rolls a

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Take the rolling mill guide roll with a diameter of 59mm as an example

[0038] Chemical composition: C1.50%, Si1.10%, Mn0.80%, Cr18.5%, Ni0.60%, V0.21%, Fe77.29%.

[0039] Heat treatment process: keep warm at 900°C for 3 hours at a heating rate of 150°C / h, cool in the furnace to 23°C-26°C; then heat with the furnace to 680°C for 1 hour; then heat at a heating rate of 260°C / h to Heat preservation at 1030°C for 4 hours, oil cooling to 23°C-26°C; then temper at 180°C at a speed of 80°C / h for 4 hours, and then cool to 23°C-26°C with the furnace.

[0040] Normal temperature performance test

[0041] Macro hardness: the hardness of the working surface layer of the guide roller is 58.5 ~ 60HRC; impact toughness: 18.7J / cm 2 .

[0042] After testing, the average service life is: 2320 tons of steel.

Embodiment 2

[0044] Take the rolling mill guide roll with a diameter of 59mm as an example

[0045] Chemical composition: C1.38%, Si1.22%, Mn0.46%, Cr19.50%, Ni0.46%, V0.28%, Fe76.7%.

[0046] Heat treatment process: keep warm at 850°C for 4 hours at a heating rate of 140°C / h, cool in the furnace to 23°C-26°C; then heat with the furnace to 700°C for 1 hour; ℃ for 2 hours, oil cooled to 23°C-26°C; then tempered at 180°C at a rate of 80°C / h for 5 hours, then cooled to 23°C-26°C with the furnace.

[0047] Normal temperature performance test:

[0048] Macro hardness: the hardness of the working surface layer of the guide roller is 57~59.5HRC; impact toughness: 18.2J / cm 2 .

[0049] After testing, the average service life is: 2630 tons of steel.

Embodiment 3

[0051] Take the rolling mill guide roll with a diameter of 59mm as an example

[0052] Chemical composition: C1.4%, Cr20%, Ni0.65%, V0.25%, Si1.1%, Mn0.6%, Fe76%.

[0053] Heat treatment process: keep warm at 850°C for 4 hours at a heating rate of 140°C / h, cool in the furnace to 23°C-26°C; then heat with the furnace to 700°C for 1 hour; ℃ for 2 hours, oil cooled to 23°C-26°C; then tempered at 180°C at a rate of 80°C / h for 5 hours, then cooled to 23°C-26°C with the furnace.

[0054] Normal temperature performance test:

[0055] Macro hardness: the hardness of the working surface layer of the guide roller is 57~60.5HRC; impact toughness: 18.3J / cm 2 .

[0056] After testing, the average service life is: 2730 tons of steel.

[0057] Through the above softening annealing, quenching and low-temperature tempering treatments, the high-temperature wear resistance, thermal stability, high-temperature corrosion resistance and impact toughness of the material can be effectively improv...

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Abstract

The invention discloses high-carbon martensitic stainless steel for a mill guide roller and a heat treatment method of the mill guide roller. The high-carbon martensitic stainless steel is prepared from the following components according to mass percent: 1.3% to 1.6% of C, 18% to 22% of Cr, 0.5% to 0.8% of Ni, 0.2% to 0.3% of V, 1.0% to 1.3% of Si, 0.4% to 0.8% of Mn and 71% to 80% of Fe. The invention further discloses the heat treatment method of the mill guide roller. The heat treatment method is characterized in that the mill guide roller is prepared from the high-carbon martensitic stainless steel, and the heat treatment method comprises the following steps of annealing treatment, quenching treatment and low-temperature tempering treatment. According to the high-carbon martensitic stainless steel and the heat treatment method, the toughness, wear resistance and corrosion resistance of the high-carbon martensitic stainless steel can be increased, so that the service life of the prepared mill guide roller is greatly prolonged.

Description

technical field [0001] The invention belongs to the field of preparation and application of novel materials, and in particular relates to a high-carbon martensitic stainless steel for rolling mill guide rolls and a heat treatment method for rolling mill guide rolls. Background technique [0002] The guide roller is a part that causes the plastic deformation of the rolled steel piece during the rolling process of the section steel. It mainly bears the dynamic and static load during rolling, and the wear of the combination of rolling and sliding. [0003] Because the guide roller works in a high temperature environment for a long time and bears the impact of intense heat and chill, the service life of the guide roller is short, the consumption is large, and the replacement is frequent, and it has become one of the bottlenecks restricting steel production. The roller materials are alloy carbon steel and cast iron, which have poor wear resistance and low service life. At present...

Claims

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Application Information

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IPC IPC(8): C22C38/46C22C38/02C22C38/04C21D1/32C21D1/18C21D9/38
CPCC22C38/46C21D1/18C21D1/32C21D9/38C21D2211/008C22C38/02C22C38/04
Inventor 赵家柱吴迪张有德赵仕章周忠航
Owner HEFEI ORIENT METALLURGICAL EQUIP
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