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Corrosion-resistant rare earth bearing steel and preparation method thereof

A technology of bearing steel and rare earth, which is applied in the field of metallurgical engineering, can solve problems such as limitations in application fields, influence on RE steel production, and backward equipment, and achieve the effects of improving internal and external quality, improving steel quality, and improving corrosion resistance

Inactive Publication Date: 2020-06-09
SHANDONG IRON & STEEL CO LTD
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Problems solved by technology

[0003] Although the use of RE elements to treat steel can significantly improve the performance and quality of steel products, there are still many problems in the use of RE to treat steel in my country, which directly affects the production of RE steel.
1) The RE addition process and equipment are backward; 2) For the production of different RE new steel types, the relationship between RE addition method, addition amount and performance needs to be further optimized. The application field is also significantly limited; 3) RE treated steel is prone to nozzle nodulation during casting, which affects the continuous mass production of RE steel

Method used

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  • Corrosion-resistant rare earth bearing steel and preparation method thereof
  • Corrosion-resistant rare earth bearing steel and preparation method thereof

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with specific examples.

[0032] The preparation process of the present invention adopts electric furnace smelting→LF furnace refining+VD vacuum degassing treatment→continuous casting (electromagnetic stirring)→slow cooling→rolling into lumber→slow cooling process.

[0033] 1. Electric furnace smelting: electric furnace smelting followed by LF refining, VD vacuum degassing, the chemical composition of the smelted billet by weight percentage is: C 0.90-1.10, Si 0.20-0.40, Mn 0.20-0.50, Cr 1.35-1.70, Cu 0.12-0.26 、Al t 0.015-0.035, P≤0.020, S≤0.010, (La+Ce) 0.003~0.005, the balance is Fe and unavoidable impurities. The actual electric furnace smelting composition is shown in Table 1. Furnace number 1 does not add rare earth and copper, furnace numbers 2 and 3 add rare earth and copper, and the three furnaces are used for performance comparison experiments. Control the basicity of the final slag to 3.2,...

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Abstract

The invention relates to corrosion-resistant rare earth bearing steel and a preparation method of the corrosion-resistant rare earth bearing steel. The corrosion-resistant rare earth bearing steel comprises the following components of, by weight percentage, 0.90-1.10wt% of C, 0.20-0.40wt% of Si, 0.20-0.50wt% of Mn, 1.35-1.70wt% of Cr, 0.12-0.26wt% of Cu, 0.015-0.035wt% of Alt, P<=0.020wt%, S<=0.010wt%, 0.003-0.005wt% of a rare earth alloy, and the balance of Fe and inevitable impurities. By adding trace rare earth, the sizes of inclusions are refined, the number of the inclusions is reduced, and the fatigue life of the bearing steel is remarkably prolonged; and meanwhile by adding the element Cu, the corrosion resistance of the bearing steel is improved, and the surface quality of thebearing steel is remarkably improved.

Description

technical field [0001] The invention belongs to the field of metallurgical engineering, and relates to a corrosion-resistant rare earth bearing steel and a preparation method thereof. Background technique [0002] The purification effect of rare earth in steel is mainly manifested in that it can deeply reduce the content of oxygen and sulfur, and reduce the harmful effects of elements such as phosphorus and low melting point. Today, as the cleanliness of steel continues to improve, the role of rare earth elements in steel will be more focused on metamorphism and strong microalloying. In addition to the metamorphic and denaturing effect on inclusions, rare earths also have a deformation effect on inclusions, which can deform harmful non-metallic inclusions such as chains, sharp corners, and long strips in molten steel into equiaxed shapes, or approach In the spindle-shaped and spherical RE complex state compounds, it significantly improves the toughness, plasticity, high-tem...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/20C22C33/04C21C7/10C21C5/52C21C7/00C21D8/06
CPCC21C5/52C21C7/0006C21C7/0056C21C7/10C21D8/065C22C33/04C22C38/002C22C38/005C22C38/02C22C38/04C22C38/06C22C38/20Y02P10/20
Inventor 刘春伟许荣昌王中学杜显彬刘茂文何毅陈良刘成宝董丙成杨旭李传振
Owner SHANDONG IRON & STEEL CO LTD
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