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Method for continuous casting of nickel-base alloy with large-specification round billet

A nickel-based alloy and round billet continuous casting technology is applied in the field of nickel-based alloy continuous casting, and can solve the problems of poor castability, surface cracks, and the influence of subsequent processing of products.

Active Publication Date: 2020-04-03
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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  • Method for continuous casting of nickel-base alloy with large-specification round billet

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 continuous casting of a nickel-base alloy with a large-specification round billet. The method is applicable to nickel-based alloys with NO 8810, NO 8825 and the like, and comprises the following sequential steps of S1, refining, specifically, adding molten steel to a refining position, adjusting components and slag systems, then performing slag pouring operation, performing VD vacuum treatment, performing VD post-calcium treatment, and carrying out soft blowing for more than 15 minutes; S2, continuous casting, specifically, adopting a split submersed nozzlecasting, wherein the inserting depth of the submersed nozzle is 80-110 mm, and the pull speed is 0.16-0.22 meter / minute, adopting three-section type two-cooling, wherein the specific water flow is 0.11-0.15L / kg, adding crystallization protective slag into a crystallizer, and carrying out M+F-EMS combined electromagnetic stirring; S3, putting the material into a pit for slow cooling; and S4, forming a round continuous casting blank with a diameter of 500 mm. According to the method, the round billet is produced through continuous casting, the surface does not need to be subjected to grinding treatment, and the subsequent electroslag remelting and forging requirements can be met.

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 Applications(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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