High-toughness wear-resistant steel with excellent cold bending performance and manufacturing method thereof

Abstract

The invention provides high-toughness wear-resistant steel with excellent cold bending performance and a manufacturing method thereof. The steel comprises the following components in percentage by weight: 0.30%-0.38% of C, 0.10%-0.25% of Si, 0.80%-1.60% of Mn, less than or equal to 0.010% of P, less than or equal to 0.003% of S, 0.2%-0.4% of Mo, 4.5%-5.5% of Ni, 0.7%-1.5% of Cr, 0.45%-0.55% of Ti, 0.015%-0.045% of Als, less than or equal to 0.0060% of N, less than or equal to 0.0020% of H and the balance of iron and inevitable impurities. The manufacturing method comprises the steps of molten iron pretreatment, converter smelting, external refining, die casting or continuous casting, heating, rolling and heat treatment. According to the steel plate produced through the method, the yield strength reaches 967-1048 MPa, the tensile strength reaches 1248-1359 MPa, the surface hardness reaches 420-468 HBW, the core hardness reaches 417-467 HBW, the ballistic work at the temperature of-40 DEG C is larger than or equal to 44 J, and 90-degree cold bending d = 5a is qualified.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a high-toughness wear-resistant steel with excellent cold bending performance and a manufacturing method thereof. Background technique [0002] With the overall upgrading of my country's industrial system, the performance requirements for basic materials continue to increase. Manufacturers of construction machinery and equipment have put forward higher requirements for the performance of wear-resistant steel, and high-wear-resistant steel plates have been developed rapidly. Particle strengthening is one of the technical means to improve the wear resistance of steel. [0003] The idea of ​​particle strengthening wear-resistant steel is to introduce dispersed and distributed stable compound particles into the steel matrix to improve the wear resistance of steel with high particle hardness. Studies have shown that micron-sized particles of TiC can significantly enhance the...

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Problems solved by technology

This patent proposes a method for producing TiC-strengthened wear-resistant steel. The wear resistance is better than that of HB450. The disadvantage is that the room temperature impact energy of this wear-resistant steel is greater than 20J. As the temperature decreases, the impact energy will decrease, and the low-temperature impact performance is not good. , and the cold bending properties of the undisclosed steel plate

This method successfully improves the plastic toughness of TiC particle-reinforced wear-resistant steel, but the room temperature impact energy of 20J is difficult to meet the conditions of use in cold environments below -20°C

[0008] Related literature 1: Liang Xiaokai et al. Research on the performance of TiC particle reinforced martensitic wear-resistant steel [J]. Iron and Steel Vanadium Titanium, 2017,38(1):49-53. This paper compares Hardox450 with TiC wear-resistant steel produced by different processes Grinding steel, under the same wear conditions, the weight loss of TiC wear-resistant steel is 70% of that of Hardox450, but the impact toughness at room temperature is poor, only 11-14J

[0009] Related literature 2: Lu Dianlei. Research on the precipitation mechanism of TiC in high-titanium wear-resistant steel [D]. Beijing: China University of Petroleum, 2017. This literature deeply studies the mechanism of TiC affecting the plastic toughness of steel, but does not give an improved process and method

[0010] To sum up, there are still insufficient researches on the low-temperature impact toughness and cold-bending performance of TiC high-wear-resistant steel in the existing technology. User needs

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