Control method for improving macroscopic quality and segregation index of high-carbon chromium bearing steel

A technology of high carbon chromium bearing steel and control method, applied in the field of metallurgical production of bearing steel, can solve the problems of low structure quality and high degree of segregation, and achieve the effect of high matching degree

Active Publication Date: 2021-02-26
建龙北满特殊钢有限责任公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of low microstructure quality and high segregation degree of existing high-carbon chromium bearing steel bi

Method used

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  • Control method for improving macroscopic quality and segregation index of high-carbon chromium bearing steel
  • Control method for improving macroscopic quality and segregation index of high-carbon chromium bearing steel
  • Control method for improving macroscopic quality and segregation index of high-carbon chromium bearing steel

Examples

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Embodiment 1

[0029] This embodiment provides a control method for improving the low-magnification quality and segregation index of high-carbon chromium bearing steel, including a smelting process control method and a continuous casting process control method.

[0030] The primary smelting stage adopts high-drawing carbon end point control, and the C content in tapping is not less than 0.35%. During the tapping process, aluminum ingots are added at one time according to the C component at the end point to complete the deep deoxidation of precipitation, creating a favorable time for purifying molten steel in the refining stage; in the refining stage Control the white slag retention time to not less than 30 minutes, the vacuum circulation time to 20 minutes, and the argon soft blowing time to not less than 30 minutes; the continuous casting stage adopts a low superheat and high casting speed method, the superheat is controlled at 25-35 ° C, and the casting speed is 0.57 m / min; the secondary co...

Embodiment 2

[0032] This example provides a specific control method for the smelting process—the initial smelting stage and the refining stage of the converter or electric furnace—in the control method for improving the low-magnification quality and segregation index of high-carbon chromium bearing steel.

[0033] The specific control methods in the initial refining stage are as follows:

[0034] Put 105 tons of pig iron, molten iron or steel material into the converter or electric furnace, use high carbon end point control, when the molten steel temperature is ≥ 1600 ℃ and the C content is ≥ 0.35%, the oxidized slag is released to prevent slag, during the tapping process The amount of slag lowered is not more than 2kg / t, the number of furnaces at the tapping port is less than 120 furnaces, and the slag blocking operation is performed when the furnace body is at 90° to prevent the oxide slag from being carried out during the tapping process. Carbon, slag making, aluminum ingots and alloys ...

Embodiment 3

[0056] This example provides specific control methods for continuous casting process—casting speed and temperature, slab cooling, electromagnetic stirring and light reduction—in the control method for improving the low-magnification quality and segregation index of high-carbon chromium bearing steel.

[0057] The continuous casting of this embodiment adopts 5 machines and 5 strands of 250mm×280mm rectangular billet.

[0058] During the continuous casting pouring process, protect the pouring. The ladle nozzle is protected by double argon collars. The molten steel after soft blowing is poured under the protection of argon gas with a flow rate of 20-40L / h to prevent secondary oxidation of molten steel. Argon is blown to the baked tundish before pouring to reduce the residual oxygen content in the tundish, and the crystallizer liquid level fluctuation is controlled within ±3mm to reduce the risk of slag entrainment caused by liquid level fluctuations.

[0059] During the pouring p...

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Abstract

The invention relates to a control method for improving the macroscopic quality and segregation index of high-carbon chromium bearing steel, and belongs to the technical field of metallurgical production. In order to solve the problems that an existing high-carbon chromium bearing steel casting blank is low in structure quality and high in segregation degree, the invention provides the control method for improving the macroscopic quality and segregation index of the high-carbon chromium bearing steel; by adopting high-carbon-drawing end point control in the smelting primary smelting stage, thetapping C content is not smaller than 0.35%; aluminum ingots are added at a time during tapping to complete precipitation deep deoxidation; in the refining stage, white slag retention time, vacuum circulation time and argon soft blowing time are controlled; in the continuous casting stage, a low-overheating and high-pulling-speed mode is adopted, a weak cooling mode is adopted for secondary cooling, the first stirring parameter M-MES is 150A/2Hz, and the final stirring parameter F-MES is 400A/18Hz; and the soft reduction parameter is 3/4/3, and the total reduction is 10mm. According to the control method for improving the macroscopic quality and segregation index of the high-carbon chromium bearing steel, the purity and the component uniformity of the molten steel are improved, and the macroscopic quality and the center segregation index of a casting blank are improved.

Description

technical field [0001] The invention belongs to the technical field of metallurgical production of bearing steel, and in particular relates to a control method for improving the low-fold quality and segregation index of high-carbon chromium bearing steel. Background technique [0002] High-carbon chromium bearing steel is one of the main products in the field of special steel production, and it is also one of the most famous and typical representative steel types in special steel. The main chemical composition of high carbon chromium bearing steel is C0.95~1.05%, Si0.15~0.35%, Mn0.25~045%, Cr1.40~1.65%. 80% of production. Due to the largest output, the most stringent quality requirements and the most inspection items, high-carbon chromium bearing steel has become one of the most difficult steel types to produce. [0003] In the production process of high-carbon chromium bearing steel, there are not only high requirements for inclusions and residual elements, but also high ...

Claims

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Application Information

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IPC IPC(8): C22C33/04C21C7/076C21C7/06C21C7/10C21C7/072B22D11/16B22D11/115B22D11/12B22D11/22
CPCC22C33/04C21C7/0025C21C7/076C21C7/0006C21C7/06C21C7/10C21C7/072B22D11/16B22D11/115B22D11/1206B22D11/225Y02P10/20
Inventor 王海达李超邢筱麟郭鑫王兴华刘庆强
Owner 建龙北满特殊钢有限责任公司
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