Production process for increasing continuous casting heats of aluminum deoxidized high-carbon chromium bearing steel

An aluminum deoxidized high-carbon chromium bearing and a production process technology, applied in the field of iron and steel metallurgy, can solve the problems of poor castability of bearing steel and unqualified water immersion flaw detection, so as to increase the number of continuous casting furnaces and solve the problem of unqualified water immersion flaw detection , reduce the effect of aggregation

Active Publication Date: 2021-09-28
ZENITH STEEL GROUP CORP +1
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Problems solved by technology

[0008] In view of the problems pointed out in the background technology that bearing steel has poor castability and unqualified water immersion flaw detection, the purpose of this invention is to propose a production process for increasing the number of continuous casting furnaces of aluminum-deoxidized high-carbon chromium bearing steel

Method used

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  • Production process for increasing continuous casting heats of aluminum deoxidized high-carbon chromium bearing steel
  • Production process for increasing continuous casting heats of aluminum deoxidized high-carbon chromium bearing steel
  • Production process for increasing continuous casting heats of aluminum deoxidized high-carbon chromium bearing steel

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Embodiment

[0021] The test steel is high-carbon chromium bearing steel, the grade is GCr15, and the production process is "converter / electric furnace—LF refining—RH vacuum treatment—billet continuous casting":

[0022] (1) During the tapping process, aluminum particles are added for deoxidation at one time, and the aluminum content in the steel is required to be added to 0.03-0.06%. At the same time, low-titanium and low-aluminum ferrosilicon is added, and the Si content in the steel is required to reach 0.10%-0.16%, before LF treatment. slag or slag removal;

[0023] (2) Add lime, quartz sand or CaO-Al to LF refining slag 2 o 3 It is one or several kinds of pre-melted slag, and it is required to ensure the final slag basicity of LF refining slag CaO / SiO 2 Control range 3.0~4.5, final slag CaO / Al 2 o 3 The control range is 1.3~2.5, the amount of refining slag added is 8~10kg / t, and the final slag is required to be 0.3%

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Abstract

The invention belongs to the field of ferrous metallurgy, and relates to a production process for increasing the continuous casting heats of aluminum deoxidized bearing steel. LF refining slag adopts a CaO-Al2O3-SiO2 slag system, the final slag alkalinity CaO/SiO2 control range is 3.0-4.5, the final slag CaO/Al2O3 control range is 1.3-2.5, the refining slag addition amount is 8-10 kg/t, and meanwhile the final slag FeO + MnO is required to be smaller than 0.8%; and a steel ladle molten pool and a ladle bottom are made of aluminum carbon, a middle ladle is made of an alumina dry material, and a stopper rod is made of an integral aluminum carbon material. According to the process, the reaction between molten steel and refractory can be reduced while the slag steel reaction is inhibited, the generation of spinel inclusions is reduced, and the continuous casting heats and the water immersion flaw detection qualification rate are obviously improved.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and relates to a production process for increasing the number of continuous casting furnaces of aluminum deoxidized bearing steel. Background technique [0002] Bearings are the key parts of mechanical parts, and have extremely high requirements on their fatigue life and performance stability. Studies have shown that the purity of bearing steel has an important impact on the fatigue life and performance stability of bearings. Therefore, in the refining process of bearing steel, metal aluminum is usually used for deoxidation, and high-alkalinity refining slag is used to ensure the purity of bearing steel. The current process can usually control the total oxygen in the steel below 6ppm, and realize the control of ultra-high cleanliness of bearing steel. However, the use of aluminum deoxidation high-alkalinity refining slag refining often produces magnesium-aluminum spinel inclusions in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06C21C7/00C04B35/66
CPCC21C7/06C21C7/0006C04B35/66C04B2235/3217C04B2235/3418C04B2235/3244C04B2235/422C04B2235/402C04B2235/9676C04B2235/9607Y02P10/20
Inventor 王昆鹏彭磊王郢徐建飞赵阳谢立陈廷军
Owner ZENITH STEEL GROUP CORP
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