High-toughness bainite wear-resistant steel suitable for liner plate of large semi-autogenous mill and preparation method of high-toughness bainite wear-resistant steel

A semi-autogenous mill, high-strength and toughness technology, applied in the field of wear-resistant steel, can solve the problems of increasing the difficulty of smelting, prone to segregation, high Mn content, etc., and achieve the effect of uniform hardness, uniform structure and composition, and uniform performance

Active Publication Date: 2019-06-21
JIANGXI NAIPU MINING MASCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the hardness reaches HRC60~65 and the toughness reaches 40~80J/cm2 after adopting this technology, it is suitable for use under high stress and low stress wear conditions, but it contains high Al, which increases the difficulty of smelting, and contains a large amount of W increased cost
[0012] The nano-bainite structure obtained in the above patents, in order to shor

Method used

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  • High-toughness bainite wear-resistant steel suitable for liner plate of large semi-autogenous mill and preparation method of high-toughness bainite wear-resistant steel
  • High-toughness bainite wear-resistant steel suitable for liner plate of large semi-autogenous mill and preparation method of high-toughness bainite wear-resistant steel
  • High-toughness bainite wear-resistant steel suitable for liner plate of large semi-autogenous mill and preparation method of high-toughness bainite wear-resistant steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 1. Melting: Melt high-quality steel scrap in an electric furnace, add ferrosilicon, ferrochrome, add electrolytic manganese, molybdenum, niobium, and recarburizer to adjust to the required composition, then transfer to a refining furnace for refining, use aluminum deoxidation during smelting, and Add rare earths to the vacuum degassing bag. Then it is cast into electrode rods, and electroslag remelting is carried out (diameter of electroslag ingot is 450mm). During electroslag remelting, ternary high-alkaline slag system is used for desulfurization and deoxidation, and then annealing process is used for electroslag ingots to eliminate casting stress.

[0043] The composition of the obtained electroslag ingot is 0.62% for C, 1.4% for Si, 1.4% for Mn, 1.7% for Cr, 0.3% for Mo, 0.03% for Nb, 0.1% for Cu, 0.2% for Ni, and 0.02% for Al , P is 0.013%, S is 0.008%, RE is 0.1%, and N is 0.01%;

[0044] 2. Forging: heating temperature 1150-1200°C, initial forging temperature 11...

Embodiment 2

[0048] 1. Melting: Melt high-quality steel scrap in an electric furnace, add ferrosilicon, ferrochrome, add electrolytic manganese, molybdenum, niobium, and recarburizer to adjust to the required composition, then transfer to a refining furnace for refining, use aluminum deoxidation during smelting, and Add rare earths to the vacuum degassing bag. Then it is cast into electrode rods, and electroslag remelting is carried out (diameter of electroslag ingot is 450mm). During electroslag remelting, ternary high-alkaline slag system is used for desulfurization and deoxidation, and then annealing process is used for electroslag ingots to eliminate casting stress.

[0049] The composition of the obtained electroslag ingot is 0.58% of C, 1.5% of Si, 1.3% of Mn, 1.7% of Cr, 0.7% of Mo, 0.03% of Nb, 0.2% of Cu, 0.2% of Ni, 0.015% of Al, P 0.015% for S, 0.01% for S, 0.05% for RE, and 0.008% for N;

[0050] 2. Forging: Heating temperature 1150-1200°C, initial forging temperature 1150°C, ...

Embodiment 3

[0054] 1. Melting: Melt high-quality steel scrap in an electric furnace, add ferrosilicon, ferrochrome, add electrolytic manganese, molybdenum, niobium, and recarburizer to adjust to the required composition, then transfer to a refining furnace for refining, use aluminum deoxidation during smelting, and Add rare earths to the vacuum degassing bag. Then it is cast into electrode rods, and electroslag remelting is carried out (diameter of electroslag ingot is 450mm). During electroslag remelting, ternary high-alkaline slag system is used for desulfurization and deoxidation, and then annealing process is used for electroslag ingots to eliminate casting stress.

[0055] The composition of the obtained electroslag ingot is 0.7% for C, 1.4% for Si, 1.1% for Mn, 2.5% for Cr, 0.5% for Mo, 0.03% for Nb, 0.3% for Cu, 0.3% for Ni, and 0.03% for Al , P is 0.01%, S is 0.004%, RE is 0.02%, and N is 0.015%;

[0056] 2. Forging: Heating temperature 1150-1200°C, initial forging temperature 11...

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Abstract

The invention provides high-toughness bainite wear-resistant steel suitable for a liner plate of a large semi-autogenous mill. The high-toughness bainite wear-resistant steel is prepared from, by masspercent, 0.4% to 0.8% of C, 1.4% to 2.5% of Si, 0.7% to 1.6% of Mn, 1.5% to 2.5% of Cr, 0.2% to 0.7% of Mo, 0.01% to 0.05% of Nb, 0.1% to 0.5% of Cu, 0.1% to 0.5% of Ni, 0 to 0.03% of Al, 0.01% to 0.2% of RE, 0.008% to 0.015% of N, not larger than 0.015% of P, not larger than 0.01% of S, not larger than 0.004% of O and the balance Fe and inevitable impurities. A preparation method is further provided, and comprises the steps that a thick plate formed through smelt forging or rolling is subjected to spheroidizing annealing and heat treatment; and the obtained wear-resistant steel contains nanoscale or submicron-scale carbide-free bainite, thin-film-shaped bainite and a small amount of blocky bainite.

Description

technical field [0001] The invention belongs to the technical field of wear-resistant steel, and in particular relates to a high-strength toughness bainitic wear-resistant steel suitable for lining plates of large semi-autogenous mills and a preparation method thereof. Background technique [0002] In the actual use of semi-autogenous mills, in order to improve work efficiency, the diameter of the cylinder gradually increases, and the diameter of large semi-autogenous mills has exceeded 12m. The liner of the large semi-autogenous mill is subjected to strong repeated impacts of steel balls and mineral materials, grinding and stripping, corrosion of the slurry, and the interaction of wear and corrosion during work, resulting in the continuous migration of the surface material of the liner and accelerating the wear of the liner. Wear and tear, and sometimes even cause the liner to break and fail, especially the damage to the cylinder liner is more serious. According to current...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/48C22C38/58C21D1/20C21D6/00C22C33/04
Inventor 郑昊潘庆卢现稳金学军
Owner JIANGXI NAIPU MINING MASCH CO LTD
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