Method for improving production efficiency of normalizing and rolling Q420NE wind power steel

By using the direct furnace charging process for cast billets and precise control of the quenching process parameters for cast billets, the problems of surface cracks and uneven performance of rolled steel plates in the production of Q420 grade wind power steel have been solved, achieving efficient production of high-quality wind power steel and reducing production costs.

CN122344680APending Publication Date: 2026-07-07INNER MONGOLIA BAOTOU STEEL UNION
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Patent Information

Application Number
CN202610492975.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-15
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

In the production of Q420 grade wind power steel, how to improve production efficiency, especially how to eliminate hot-loading cracks on the surface of rolled steel plates, ensure the uniformity of the performance of finished steel plates, and reduce production costs.

Method used

By adopting the direct loading process of cast billets into the furnace, the slow cooling process is eliminated, the production cycle is shortened, and the quenching time of the cast billets is controlled by specifying the water flow ratio of the upper and lower spray beams of the quenching machine, the water column height, and the continuous casting billet transmission speed. Combined with appropriate heating and controlled rolling processes, the microstructure of the steel plate is ensured to be fine ferrite + pearlite + bainite, and the hot charging cracks on the surface of the rolled steel plate are eliminated.

Benefits of technology

It effectively eliminates hot-charging cracks on the surface of rolled steel plates, ensures the uniformity of the finished steel plates' performance, improves rolling efficiency, reduces the energy consumption of billet heating, and produces Q420 grade wind power steel with excellent comprehensive performance.

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Abstract

The invention discloses a method for improving the production efficiency of normalizing and rolling Q420NE wind power steel. The Q420NE wind power steel comprises the following chemical components in percentage by weight: 0.16-0.18% of C; 0.20% to 0.30% of Si; mn: 1.45 to 1.65%; 0.035% to 0.045% of Nb; 0.035% to 0.045% of V; 0.010% to 0.020% of Ti; less than or equal to 0.015% of P; s < = 0.005%; 0.0008 to 0.0020% of Ca (calcium); the content of Als is 0.015 to 0.030 percent; o: < = 0.0035%; n: < = 0.0052%; and the balance of iron and inevitable impurities. The invention further discloses a specific preparation process and control parameters. The prepared steel plate is good in strength, plasticity and toughness, and the structure of the steel plate is fine ferrite, pearlite and bainite.
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