Method for producing continuous casting round billet of wind power tower cylinder flange steel
A technology for wind power towers and continuous casting round billets, which is applied in the field of metallurgy and can solve the problems of increased difficulty in production process and quality control, and low pass rate of product flaw detection.
Active Publication Date: 2014-07-23
LAIWU IRON & STEEL GRP
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Problems solved by technology
[0004] At present, although there are many patent documents and professional documents on the production of S355NL steel continuous casting round billets, internal quality defects such as intermediate cracks, central cracks, central shrinkage cavities, and central segregation still commonly exist in S355NL steel large-section round billets, and the With the continuous increase of the cross-section of the continuous casting round billet of this steel type, the difficulty of production process and quality control also increases, which eventually leads to a serious low pass rate of flaw detection of the finished product
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Embodiment 1
[0041] The steel used for the flange of the wind power tower is made of a continuous casting machine with a full arc radius of 16.5m. During the continuous casting process, the superheat of the continuous casting molten steel is controlled at 23°C, the secondary cooling zone of the continuous casting slab is cooled by air mist, and the specific water volume is controlled at 0.16L / kg 钢 , the casting speed is controlled to 0.32m / min, the current of the electromagnetic stirring of the mold is controlled at 300A, the frequency is controlled at 3.0Hz, the current of the electromagnetic stirring at the end of solidification is controlled at 400A, and the frequency is controlled at 10Hz. Add mold flux into the crystallizer, and the alkalinity of the mold flux is 0.7, the melting temperature is 1175°C, and the viscosity is 1.5Pa·S. The round billet is straightened by continuous straightening. Obtain a steel round billet with a diameter of 650 mm for the flange of the wind power tower...
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Abstract
The invention discloses a method for producing a continuous casting round billet of wind power tower cylinder flange steel. The method comprises the steps that the degree of superheat of continuous casting liquid steel is controlled within the range from 21 DEG C to 25 DEG C in the continuous casting process; air water atomizing cooling serves as the cooling mode in a secondary cooling area, the specific water flow is controlled within the range from 0.15 L / kg to 0.18 L / kg, the casting speed is controlled within the range from 0.30 m / min to 0.34 m / min, the current of electromagnetic stirring of a crystallizer is controlled within the range from 200 A to 300 A, the frequency of electromagnetic stirring of the crystallizer is controlled within the range from 2.0 Hz to 3.0 Hz, the current of electromagnetic stirring of the tail end of solidification is controlled within the range from 350 A to 400 A, and the frequency electromagnetic stirring of the tail end of solidification is controlled within the range from 8 Hz to 12 Hz. According to the method, the surface quality and interior quality of the continuous casting round billet of wind power tower cylinder flange steel can be effectively improved by setting and optimizing technological parameters. In addition, a finished wind power tower cylinder flange machined through the round billet obtained according to the method can completely meet the quality requirement of the wind power tower cylinder flange steel after ultrasonic flaw detection.
Description
technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for producing a continuous casting round billet of steel used for the flange of a wind power tower tube. Background technique [0002] With the rapid growth of wind power generation, the market demand for wind power towers is also increasing, and the importance of tower flanges, the key connector of wind power towers, is also getting more and more attention. [0003] The steel for the flange of the wind power tower (S355NL steel) is the key connection, support and force-bearing part of the wind power tower, and an important part of the wind power generation equipment. The qualified rate of ultrasonic non-destructive testing for processed products is 100%. This means that the raw material (for example, a continuously cast round billet with a diameter of 650 mm) is required to have a very high surface and internal quality. [0004] At present, although ther...
Claims
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Login to View More IPC IPC(8): B22D11/00B22D11/16B22D11/111B22D1/00
Inventor 邵明海马丙涛于学文刘兵吴明洋刘超群闻小德韩永刚吴兵周艳丽倪友来
Owner LAIWU IRON & STEEL GRP