Process for improving structure performance of wind power steel Q355

Abstract

The invention discloses a process for improving the structure performance of wind power steel Q355. After the design of wind power steel components is determined, the rolling process adopts CR+ACC, wherein a controlled rolling and controlled cooling process mode is used for production, and the main path of the wind power steel production process flow is that a plate blank is heated by a heating furnace, cogged and rolled by a roughing mill, and rolled into a finished product by a finishing mill; the heating temperature of a soaking section in a heating furnace area is optimized and adjusted to 1130 DEG C-1180 DEG C, and compared with a conventional temperature process, the grain size is improved by 0.5 grade, and grains are more uniform; the pass reduction rate in the rough rolling elongation stage is increased to 15% or above, and at the moment, the grain size of the finished product is 9 grades-10 grades and is averagely increased by about 1 grade; and the finish rolling temperature is set to be 810 DEG C and is reduced by 40 DEG C compared with the conventional temperature, grains in the steel plate are further refined, and meanwhile, the uniformity of the structure is improved.

Description

technical field [0001] The invention relates to a process for improving the microstructure and properties of wind power steel Q355. Background technique [0002] Wind power generation is to convert the kinetic energy of the wind into mechanical energy, and then convert the mechanical energy into electrical kinetic energy. A wind turbine consists of three parts: the nose, the tower, and the foundation. The tower is the load-bearing part of the entire wind turbine and is the part that uses the most wind power steel. [0003] The main variety of wind power steel plate is Q355, which must have high strength and toughness, low welding crack sensitivity, and at the same time ensure the stability of wind power steel product performance. The composition system used in the production of wind power steel plates for medium and heavy plates is C-Mn system, and the steel plate structure is mainly ferrite + pearlite. In the actual production process, the performance qualification rate o...

AI Technical Summary

Problems solved by technology

In the actual production process, the performance qualification rate of wind power steel products is about 95%, but there are still some products whose performance does not meet the requirements of the national standard. , due to the uneven internal structure, resulting in performance differences. The performance of the sampling part of the steel plate is qualified, but there will be unqualified conditions in other areas. Such products are made into wind power towers during the user's use, and the weak performance areas will be It will become a hidden danger to the entire tower, and the wind power tower is at risk of collapse

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