Heating control method of steel rolling heating furnace applicable to pipeline steel

Abstract

The invention relates to a heating control method of a steel rolling heating furnace applicable to pipeline steel. A four-stage heating mode is adopted. The temperature at the preheating stage is 1100+ / -50 DEG C, and the preheating time is more than or equal to 105 min; the temperature at the first heating stage is 1200+ / -30 DEG C, and the heating time is more than or equal to 30 min and less than or equal to 60 min; the temperature at the second heating stage is 1220+ / -20 DEG C, and the heating time is more than or equal to 35 min and less than or equal to 60 min; the temperature at the uniform heating stage is 1180+ / -20 DEG C, and the heating time is more than or equal to 40 min; the temperature of a flue inlet is 750+ / -50 DEG C; the heating speed before the temperature of a plate blank is lower than or equal to 600 DEG C is controlled not to be higher than 7 DEG C / min, and the difference between the adjacent lowest temperature and the highest temperature in the length direction of the plate blank is controlled to be lower than or equal to 8 DEG C. By means of the heating control method, the continuity of the plate blank heating process is guaranteed, and plate blank cracks caused by improper heating speed are avoided; the performance stability of the whole plate is effectively guaranteed in the pipeline steel rolling process, and steel wasting production accidents and plate blank black print defects caused by squatting and bending of an intermediate billet are avoided.

Description

technical field [0001] The invention relates to a heating control method for a steel rolling heating furnace suitable for pipeline steel, and belongs to the technical field of steel rolling heating furnace process control. Background technique [0002] Pipeline steel is widely used in oil, natural gas, gas energy or coal, building material slurry transportation and other fields. Since pipeline steel is directly related to national economic development and even national energy strategy security, the market demand is very large, so major iron and steel enterprises are paying more and more attention to it. R&D and production of pipeline steel products. The production of pipeline steel mainly adopts hot rolling process at present, and the hot rolling process mainly includes three main processes of heating, rolling and cooling, among which the heating process is the most critical process control link in the production of pipeline steel; Or ultra-low carbon micro-alloyed steel, N...

AI Technical Summary

Problems solved by technology

The production of pipeline steel mainly adopts hot rolling process at present, and the hot rolling process mainly includes three main processes of heating, rolling and cooling, among which the heating process is the most critical process control link in the production of pipeline steel; Or ultra-low carbon micro-alloyed steel, Ni, Mo, Cr, Cu, V, Ti, Al and other alloying elements are usually added to the element composition, so that the heating process control of pipeline steel is obviously different from other carbon steels, so that the heating process It has become a difficult point in the control of pipeline steel production process. The heating quality not only has a direct impact on the mechanical properties, process properties and chemical properties of pipeline steel, but also has a great impact on the stability and continuity of the production process. For example, the intermediate billet in the production process Problems such as rolling instability caused by temperature fluctuations in the length direction of scrap steel and slabs caused by warped heads