Continuous casting process for controlling shrinkage cavity of 82B steel grade
By controlling the pulling range in the 82B steel continuous casting process, a regular regression curve of the impact of pulling on shrinkage is established, the shrinkage problem is solved, product quality is improved, and customers' high-quality requirements are met.
Patent Information
- Application Number
- CN202310657470.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-06-05
- Publication Date
- 2024-12-13
AI Technical Summary
During the continuous casting of 82B steel grades, the shrinkage problem leads to unstable product quality, prone to pulling and breaking, which cannot meet the high-quality requirements of customers.
By establishing a regular regression curve of the effect of pulling speed on shrinkage, the pulling speed is controlled within the range of 1.6m/min-1.8m/min to ensure the optimization of the casting blank quality.
The shrinkage level of 82B steel is effectively controlled, and the product quality is improved, so that 95% of the casting billet shrinkage holes are lower than 2 levels, meeting the user's use requirements.
Abstract
Description
Technical Field
[0001] The invention relates to a continuous casting process for controlling shrinkage cavities of 82B steel. Background Art
[0002] As the market user side has higher requirements for steel quality, it also prompts our steel enterprises to continuously optimize the process flow to obtain high-quality steel products. As a high-quality wire rod, 82B requires fewer inclusions in the ingot, smaller inclusion particle size, smaller central carbon segregation, and better surface quality. The shrinkage of the continuous casting billet has a great influence on the quality of 82B products. Drawing fractures will occur during the drawing process, and the product quality cannot meet the customer's use requirements. Since the development of 82B steel, controlling the shrinkage of 82B steel continuous casting billets has become a key task for Bayi Steel.
[0003] Retrieval of literature: The search found "82B Ingot Filling Deficiency Analysis and Quality Improvement". By comparison, the present invention is very different from such papers and inventions. The above inventions are mainly from a theoretical perspective, while the present invention focuses on verifying the actual production of ingots. Summary of the invention
[0004] The purpose of the present invention is to provide a continuous casting process for controlling shrinkage holes of 82B steel. By establishing a regression curve of the influence of different drawing speeds on shrinkage holes, the shrinkage holes of 82B steel can be effectively controlled within the range of level 2, so that the production of 82B can meet the user's usage requirements.
[0005] The technical solution adopted by the present invention is a continuous casting process for controlling shrinkage holes of 82B steel, wherein the drawing speed is controlled within the range of 1.6m / min-1.8m / min under the secondary cooling system, and the quality of the ingot is good.
[0006] From the regression curve of the influence of drawing speed on shrinkage, y=2.3337x-3.5155, it can be seen that the shrinkage level increases with the increase of drawing speed. When the drawing speed is 1.5m / min-1.6m / min, the shrinkage level is very small and is within 0.5. When the drawing speed is 1.7m / min-1.85m / min, the shrinkage level is within 1.5, accounting for 80%, and each level is evenly distributed. Level 2 also accounts for a certain proportion. When the drawing speed is in the range of 1.8m / min-1.9m / min, the shrinkage level increases. From the distribution of shrinkage levels, it can be seen that when the drawing speed is controlled at 1.5m / min-1.6m / min, the quality of the ingot is the highest, but the drawing speed is too slow; when the drawing speed is controlled at 1.7m / min-1.8m / min, each level is evenly distributed, which has little effect on the shrinkage level, but the shrinkage level is higher. When the drawing speed is in the range of 1.8 m / min-1.9 m / min, the shrinkage level increases and the speed is also faster. Taking all the above factors into consideration, the quality of the casting billet is better when the drawing speed is controlled in the range of 1.6 m / min-1.8 m / min under the secondary cooling system.
[0007] This process has a significant improvement on the shrinkage holes of 82B. When the pulling speed is 1.6m / min-1.8m / min, the proportion of shrinkage holes below level 2 in the ingot can reach 95%. Implementation
[0008] A continuous casting process for controlling shrinkage holes in 82B steel, wherein the casting speed is controlled within the range of 1.6m / min-1.8m / min under secondary cooling, and the quality of the ingot is good.
Claims
1. A continuous casting process for controlling shrinkage holes in 82B steel, characterized in that: Under the secondary cooling system, the drawing speed is controlled in the range of 1.6m / min-1.8m / min, and the quality of the ingot is good.