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A method for continuous casting of nickel-based alloys with large-size round billets

A nickel-based alloy, round billet continuous casting technology, applied in the field of nickel-based alloy continuous casting production, can solve the problems of surface cracks, nozzle nodules and dead, high alloy content

Active Publication Date: 2021-11-02
江阴华润制钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] This type of steel has high alloy content, the liquidus temperature is only about 1370°C ~ 1400°C, and contains a lot of Ti and Al elements. surface cracks in
Great influence on subsequent processing of products

Method used

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  • A method for continuous casting of nickel-based alloys with large-size round billets

Examples

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example 1

[0021] I. This embodiment is in section diameter It is carried out on a three-machine three-stream continuous casting machine, continuously casting nickel-based alloy N08810, and the liquidus temperature is 1373°C.

[0022] II. Take 65 tons of molten steel to the LF furnace for sampling, and measure the temperature at 1556°C; turn on the electricity to raise the temperature, add 300kg of active lime, 150 meters of aluminum wire for deoxidation and slagging, and use electrolytic manganese to adjust the composition according to the sample. When the temperature and composition basically meet the process requirements. The temperature was measured at 1625°C, and the slag dumping operation was carried out.

[0023] III. Hang the bag to the VD furnace seat bag, measure the temperature at 1605°C, and perform vacuum degassing treatment. After 8 minutes, the vacuum degree reaches 0.35Pa, and the high vacuum is maintained for 14 minutes. After breaking the air, measure temperature, ta...

example 2

[0030] I. This embodiment is in section diameter It is carried out on a three-machine three-strand continuous casting machine, continuously casting nickel-based alloy N08825, and the liquidus temperature is 1375°C.

[0031] II. Take 68 tons of molten steel to the LF furnace for sampling, and measure the temperature at 1546°C; turn on the electricity to raise the temperature, add 300kg of active lime, 150 meters of aluminum wire for deoxidation and slagging, and use electrolytic manganese to adjust the composition according to the sample. When the temperature and composition basically meet the process requirements. The temperature was measured at 1633°C, and the slag dumping operation was carried out.

[0032] III. Hang the bag to the VD furnace seat bag, measure the temperature at 1618°C, and perform vacuum degassing treatment. After 7 minutes, the vacuum degree reaches 0.45Pa, and the high vacuum is maintained for 16 minutes. After breaking the air, measure temperature, ta...

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Abstract

The invention discloses a method for continuously casting nickel-based alloys with large size round billets. The applicable nickel-based alloys include NO8810, NO8825, etc., which includes the following steps in sequence: Step 1: Refining: molten steel reaches the refining position, and the composition is adjusted And slag system, then carry out slag dumping operation, after VD vacuum treatment, calcium treatment after VD and soft blowing for more than 15 minutes; Step 2: Continuous casting: casting with split immersion nozzle, the insertion depth of immersion nozzle is 80-110mm; The speed is 0.16-0.22m / min; three-stage secondary cooling is adopted, and the specific water volume is 0.11-0.15L / kg; crystallization powder is added to the crystallizer, and M+F-EMS is used for electromagnetic stirring. Step 3: slow cooling in the pit; Step 4: forming a circular continuous casting slab with a diameter of 500 mm. The round billet continuously cast by the method does not need grinding treatment on the surface, and can meet the requirements of subsequent electroslag remelting and forging.

Description

technical field [0001] The invention relates to the field of continuous casting of nickel-based alloys, and relates to a method for continuously casting nickel-based alloys with large-size round billets using an arc-shaped continuous casting machine. Background technique [0002] Nickel-based alloys refer to a class of alloys that have comprehensive properties such as high strength and certain oxidation and corrosion resistance at high temperatures of 650-1000 °C. Generally, the Ni content exceeds 30%, and the Ni content of common products exceeds 50%. It has superior high-temperature mechanical strength and corrosion resistance. It is generally used in high-temperature environments above 540 ° C. According to its use, different alloy designs are selected. It is mostly used in special corrosion-resistant environments, high-temperature corrosion environments, and high-temperature mechanical strength. equipment. Often used in aerospace, energy, petrochemical industry or speci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/10C21C7/06C21C7/00B22D11/111B22D11/115
CPCB22D11/002B22D11/111B22D11/115C21C7/0056C21C7/06C21C7/10
Inventor 张亚彬凌元祥吕世建郭长华庞于思廖斌赵江
Owner 江阴华润制钢有限公司
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