2 results about "Internal quality" patented technology

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.