Carbide-containing high-strength high-toughness bainite wear-resistant steel and preparation method thereof

A high-strength toughness and wear-resistant steel technology, applied in the field of wear-resistant steel, can solve the problems of difficulty in improving toughness and insufficient toughness reserves.

Active Publication Date: 2021-04-23
JIANGXI NAIPU MINING MASCH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nevertheless, high chromium white cast iron is still a kind of brittle material, and there is still a shortcoming of insufficient toughness reserve in the application process
[0004] The improvement of the toughness of white cast iron requires a good wear-res

Method used

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  • Carbide-containing high-strength high-toughness bainite wear-resistant steel and preparation method thereof
  • Carbide-containing high-strength high-toughness bainite wear-resistant steel and preparation method thereof
  • Carbide-containing high-strength high-toughness bainite wear-resistant steel and preparation method thereof

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Experimental program
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Example Embodiment

[0040]The above-mentioned preparation method of the above-mentioned carbonized high-strength wetten wear-resistant steel is disclosed, including the following steps:

[0041]1) Melting and forging: Mechanized steel water with electric furnace or converter smelting the above-mentioned bainite wear-resistant steel, a bainite wear-resistant steel chemical group has become 0.6 to 1.2% by weight, Si is 1.2 to 2.5% by weight, and the MN is 0.8 ~ 2.0 wt%, Cr is 5 ~ 10% by weight, p ≤ 0.015 wt%, s ≤ 0.3 ~ 0.7 wt%, Ni is 0.3 ~ 0.7 wt%, the margin is Fe and inevitable trace impurities Steel water needs to be refined and conventional vacuum degassing treatment in conventional furnace, and then adding RE after degassing, casting into a ingot, and then rolling or forging ingot, the plate comprising spheroid carbide and spheroidization Pearl tissue; if the ingot is forged, the forging treatment process is: the heating temperature is 1150 ~ 1180 ° C, the starting temperature is 1100 ~ 1150 ° C, the f...

Example Embodiment

[0044]Example 1

[0045]1, smelting: Melting high-quality scrap in the electric furnace, add silicon iron, chromium iron, add electrolyte manganese, molybdenum, and supplement to the desired component, then transfer to refining furnace refining, add rare earth further purification ingredients, Pouring into a ingot. The resulting ingot component was: C was 0.9 wt%, Si was 1.5 wt%, the Mn was 1.5 wt%, and the CR was 9 wt%, the MO was 0.5% by weight, and Ni was 0.016 wt%, and the S was 0.006. WT%, margin is Fe and inevitable trace impurities.

[0046]2, forging: forging temperature of 1150 ~ 1180 ° C, start forging temperature 1120 ° C, final forging temperature 950 ° C, forging ratio of 8, after the thickness of 300 mm is cooled to room temperature, subsequently gathered annealing; microstructure Spherical carbide and pearlite matrix, such asfigure 1 ,figure 2 withimage 3 Indicated. Carbide content such asFigure 6Down, Cr7C3The volume fraction can reach 7%, M23C6The volume fraction can reac...

Example Embodiment

[0049]Example 2

[0050]1, smelting: Melting high-quality scrap in the electric furnace, add silicon iron, chromium iron, add electrolyte manganese, molybdenum, and supplement to the desired component, then transfer to refining furnace refining, add rare earth further purification ingredients, Pouring into a ingot. The resulting ingot component was 0.75 wt%, Si was 1.5 wt%, and the Mn was 1.2% by weight, CR was 6 wt%, MO was 0.5 wt%, Ni 0.6% by weight, P 0.015 wt%, S 0.006 wt%, Quantity is Fe and inevitable trace impurities.

[0051]2. Forging: Forging heating temperature 1150 ~ 1180 ° C, starting temperature 1150 ° C, final forging temperature 950 ° C forging ratio 8, after 300 mm thick forging forging forging forging, cooling to room temperature, then spherical annealing; microstructure is still spherical carbonization Grounds and pearlescent matrices.

[0052]3, final heat treatment: first<100 / h heated to 600 ° C for 2.5 hours, then heated to 880 ° C, holding 450 min, and then used the ...

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Abstract

The invention provides carbide-containing high-strength high-toughness bainite wear-resistant steel and a preparation method thereof, and relates to the technical field of wear-resistant steel. The wear-resistant steel comprises the following chemical components: 0.6 to 1.2 percent by weight of C, 1.2 to 2.5 percent by weight of Si, 0.8 to 2.0 percent by weight of Mn, 5 to 10 percent by weight of Cr, less than or equal to 0.015 percent by weight of P, less than or equal to 0.01 percent by weight of S, 0.3 to 0.7 percent by weight of Mo, 0.3 to 0.7 percent by weight of Ni and the balance of Fe and inevitable trace impurities. The preparation method comprises the following steps of firstly smelting and casting into a cast ingot according to designed components, then forging or rolling into a plate blank, and carrying out spheroidizing annealing treatment; and finally, carrying out heat treatment through an isothermal quenching process, then heating to 850 to 950 DEG C, carrying out heat preservation for 2 to 6 hours to finish austenitizing, then cooling to 310 to 380 DEG C at a cooling speed sufficient to avoid pearlite phase change, carrying out isothermal treatment for 8 to 15 hours, then transferring to an air furnace with the temperature of 200 to 280 DEG C for isothermal treatment, and finally carrying out air cooling to room temperature. A microstructure of the prepared wear-resistant steel is as follows: a matrix is micro/nano-scale bainite ferrite and film-shaped austenite which are distributed alternately, spherical carbide with the diameter of 0.5 to 2 microns is dispersed and distributed on the matrix, the volume percentage of the spherical carbide is 7 to 12 percent, and the performance is excellent.

Description

technical field [0001] The invention relates to the technical field of wear-resistant steel, in particular to a carbide-containing high-strength toughness bainitic wear-resistant steel and a preparation method thereof. Background technique [0002] Wear-resistant liner is a main spare part of crushing equipment widely used in metallurgy, mining and other industries. It is subjected to repeated impacts of steel balls and mineral materials, grinding and stripping, corrosion of ore pulp, and interaction between wear and corrosion. , resulting in the continuous migration of the surface material of the liner, and sometimes even cause the liner to break and fail. The currently used metal liners are made of cast materials, such as high manganese steel, high chromium cast iron, CADI, low alloy steel, etc. High manganese steel is a single-phase austenite structure with low yield strength and is prone to plastic deformation during use, making maintenance and disassembly very difficul...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/58C21D1/20C21D1/32C21D6/00C22C33/04
CPCC22C38/02C22C38/04C22C38/44C22C38/58C22C33/04C21D1/32C21D1/20C21D6/004C21D6/005C21D6/008C21D2211/002C21D2211/005C21D2211/001C21D2211/004
Inventor 潘庆卢现稳郑昊边泊乾金学军刘丙岗
Owner JIANGXI NAIPU MINING MASCH CO LTD
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