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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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  • Summary
  • 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-resistant phase and a strong and tough matrix, but it is difficult for white cast iron with carbide as the wear-resistant phase to meet these two requirements at the same time, so it is difficult to make a major breakthrough in the improvement of its toughness

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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preparation example Construction

[0040] The preparation method of the above-mentioned carbide-containing high-strength toughness bainitic wear-resistant steel disclosed by the present invention comprises the following steps:

[0041] 1) Smelting and forging: use an electric furnace or a converter to smelt the molten steel of the above-mentioned bainite wear-resistant steel. The chemical composition of the bainite wear-resistant steel is: C is 0.6-1.2wt%, Si is 1.2-2.5wt%, and Mn is 0.8 ~2.0wt%, Cr is 5~10wt%, P≤0.015wt%, S≤0.01wt%, Mo is 0.3~0.7wt%, Ni is 0.3~0.7wt%, the balance is Fe and unavoidable trace impurities ;Molten steel needs to be subjected to conventional refining outside the furnace and conventional vacuum degassing treatment, and RE is added after degassing, cast into an ingot, and then the ingot is rolled or forged into a plate, which contains spherical carbide and spheroidized Pearlite structure; if the ingot is forged into a plate, the forging process is as follows: the heating temperature i...

Embodiment 1

[0045] 1. Melting: Melt high-quality steel scrap in an electric furnace, add ferrosilicon, ferrochromium, electrolytic manganese, molybdenum, and carburizers to adjust to the required composition, then transfer to a refining furnace for refining, and add rare earth to further purify the composition after degassing. Cast into ingots. The obtained ingot composition is: C is 0.9wt%, Si is 1.5wt%, Mn is 1.5wt%, Cr is 9wt%, Mo is 0.5wt%, Ni is 0.5wt%, P is 0.016wt%, S is 0.006 wt%, the balance is Fe and unavoidable trace impurities.

[0046] 2. Forging: Forging heating temperature is 1150-1180°C, initial forging temperature is 1120°C, final forging temperature is 950°C, forging ratio is 8, after forging a forging with a thickness of 300mm, it is slowly cooled to room temperature, and then spheroidized and annealed; the microstructure is Spheroidal carbides and pearlite matrix, such as figure 1 , figure 2 with image 3 shown. Carbide content such as Image 6 Shown, Cr 7 C 3...

Embodiment 2

[0050] 1. Melting: Melt high-quality steel scrap in an electric furnace, add ferrosilicon, ferrochromium, electrolytic manganese, molybdenum, and carburizers to adjust to the required composition, then transfer to a refining furnace for refining, and add rare earth to further purify the composition after degassing. Cast into ingots. Gained ingot composition is that C is 0.75wt%, Si is 1.5wt%, Mn is 1.2wt%, Cr is 6wt%, Mo is 0.5wt%, Ni 0.6wt%, P 0.015wt%, S 0.006wt%, remaining The amount is Fe and unavoidable trace impurities.

[0051] 2. Forging: forging heating temperature 1150-1180°C, initial forging temperature 1150°C, final forging temperature 950°C forging ratio 8, after forging into a 300mm thick forging, slowly cool to room temperature, and then spheroidizing annealing; the microstructure is still spherical carbonization and pearlite matrix.

[0052] 3. Final heat treatment: first heat up to 600°C at <100 / h and hold for 2.5h, then heat to 880°C, hold for 450min, then ...

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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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