Wear-resistant steel and production method thereof

A production method and wear-resistant steel technology, which is applied in the field of steel production, can solve problems such as sudden brittle fracture, high strength, and delayed cracks, and achieve the goals of refining the grain size of the structure, solving stress defects, and avoiding phase transition cracks Effect

Pending Publication Date: 2022-05-24
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the high strength of wear-resistant steel, the produced structure is martensite. Delayed cracks are prone to occur after flame cutting. There is

Method used

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  • Wear-resistant steel and production method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A wear-resistant steel provided in this embodiment has the following chemical composition and mass percentage: C: 0.23%, Si: 0.41%, Mn: 0.86%, P: 0.011%, S: 0.001%, Nb: 0.031%, V: 0.001%, Ti: 0.016%, Cr: 0.51%, Ni: 0.020%, Mo: 0.21%, Al: 0.041%, B: 0.0016%, Mg: 0.0015%, N: 0.0021%, the balance is Fe and unavoidable of impurities.

[0031] Its manufacturing method includes the following steps:

[0032] S1. The molten iron after desulfurization is smelted in a smelting furnace, deoxidized and alloyed by LF, and then sent to RH vacuum treatment. The vacuum degree is not more than 3.0mbar. After meeting the vacuum degree requirements, the vacuum treatment time is 18 minutes. After the vacuum is completed, magnesium-aluminum wire is used for magnesium treatment. Stir statically for 15min after magnesium treatment;

[0033] S2. After the molten steel is transported, it is sent to the continuous casting station for casting. The superheat of the tundish is 23°C, the continuou...

Embodiment 2

[0039] The chemical composition and mass percentage of a wear-resistant steel provided in this embodiment are as follows: C: 0.36%, Si: 0.29%, Mn: 0.76%, P: 0.010%, S: 0.001%, Nb: 0.051%, V : 0.001%, Ti: 0.021%, Cr: 0.65%, Ni: 0.002%, Mo: 0.13%, Al: 0.048%, B: 0.0019%, Mg: 0.0016%, N: 0.0041%, the balance is Fe and not Avoid impurities.

[0040] Its manufacturing method includes the following steps:

[0041] S1. The molten iron after desulfurization is smelted in a smelting furnace, deoxidized and alloyed by LF, and then sent to RH vacuum treatment. The vacuum degree is not more than 3.0mbar. After meeting the vacuum degree requirements, the vacuum treatment time is 21min. After the vacuum is completed, magnesium aluminum wire is used for magnesium treatment. Stir statically for 15min after magnesium treatment;

[0042] S2. After the molten steel is transported, it is sent to the continuous casting table for casting. The superheat of the tundish is 23°C, the continuous casti...

Embodiment 3

[0048] The chemical composition and mass percentage of the wear-resistant steel provided in this embodiment are as follows: C: 0.19%, Si: 0.27%, Mn: 1.2%, P: 0.013%, S: 0.002%, Nb: 0.013%, V : 0.005%, Ti: 0.012%, Cr: 0.51%, Ni: 0.03%, Mo: 0.31%, Al: 0.039%, B: 0.0023%, Mg: 0.0017%, N: 0.0029%, the balance is Fe and not Avoid impurities.

[0049] Its manufacturing method includes the following steps:

[0050] S1. The molten iron after desulfurization is smelted in a smelting furnace, deoxidized and alloyed by LF, and then sent to RH vacuum treatment. The vacuum degree is not more than 3.0mbar. After meeting the vacuum degree requirements, the vacuum treatment time is 17min. After the vacuum is completed, magnesium aluminum wire is used for magnesium treatment. After the magnesium treatment, static stirring was performed for 16 min;

[0051] S2. After the molten steel is transported, it is sent to the continuous casting table for casting. The superheat of the tundish is 19°C, ...

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Abstract

The invention discloses wear-resistant steel and a production method thereof, and relates to the technical field of steel production, and the wear-resistant steel comprises the following chemical components in percentage by mass: 0.10 to 0.45 percent of C, 0.20 to 0.55 percent of Si, 0.50 to 1.50 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.003 percent of S, less than or equal to 0.060 percent of Nb, less than or equal to 0.030 percent of V, 0.008 to 0.025 percent of Ti, 0.20 to 1.00 percent of Cr, less than or equal to 1.80 percent of Ni, less than or equal to 0.50 percent of Mo, 0.025 to 0.055 percent of Al, 0.0010 to 0.0030 percent of B, 0.0010 to 0.0018 percent of Mg, less than or equal to 0.0045 percent of N and the balance of Fe and inevitable impurities. On the premise that the high-strength martensite structure of the wear-resistant steel plate is guaranteed, through quantitative treatment of microalloying elements, the number and the size of carbonitride are reduced, the cooling speed and the austenite temperature of a casting blank are regulated and controlled, a secondary quenching optimization process is adopted, structure grains are refined, structure stress is eliminated, and the wear resistance of the wear-resistant steel plate is improved. The problem of delayed cracks of wear-resistant steel in the cutting and grinding process of casting blanks and steel plates is solved.

Description

technical field [0001] The invention relates to the technical field of iron and steel production, in particular to a wear-resistant steel and a production method thereof. Background technique [0002] Wear-resistant steel is a low-alloy high-strength martensitic steel, which is widely used for its high strength and high toughness due to its low content of alloying elements. In order to achieve high wear resistance, laser cutting, plasma cutting, flame cutting and other cutting methods can be used in the later cutting process of wear-resistant steel plates. Among them, laser cutting and plasma cutting have requirements on the thickness of the steel plate to be cut, so there are certain limitations. . Flame cutting is widely used because of its low cost, easy operation, high cutting efficiency, and a wide range of steel plate thicknesses that can be cut. Due to the high strength of wear-resistant steel, the production structure is martensite. After flame cutting, delayed cra...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/28C22C38/26C22C38/24C22C38/22C22C38/06C22C38/32C22C38/48C22C38/46C22C38/50C22C38/44C22C38/54C21D8/02C21D1/18C21C7/00C21C7/10
CPCC22C38/02C22C38/04C22C38/28C22C38/26C22C38/24C22C38/22C22C38/06C22C38/32C22C38/48C22C38/46C22C38/50C22C38/44C22C38/54C21D8/0226C21D8/0263C21D1/18C21C7/0006C21C7/0056C21C7/10
Inventor 翟冬雨
Owner NANJING IRON & STEEL CO LTD
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