Method for controlling heating on edges of steel coil edge and heating device

Abstract

The invention discloses a method for controlling the heating on the edges of a steel coil edge and a heating device. By steel coil edge heating devices arranged on heating working positions on the left and right sides of the steel coil, the PLC is controlled to receive inside and outside diameter data, a circular track of the movement of a heating disc is worked out, and one heating track mode ofa small circle heating mode and a big circle heating mode is adopted; and meanwhile, one heating flame mode of a small flame mode and a big flame mode is automatically selected to heat end faces of both sides of the steel coil, and the PLC is controlled to heat the edges of the strip steel up to the temperature of between 80 and 150 DEG C according to the set process temperature, preferred between 100 and 120 DEG C. The method and the device solve the problem that the crack extends to the depth in the processes of uncoiling and cutting the strip steel; and the investment is only one tenth of that of an electric induction heater.

Description

technical field [0001] The invention relates to a finishing steel coil heating method, in particular to a steel coil edge heating control method which can effectively prevent strip steel edge cracks from extending. Background technique [0002] At present, domestic and foreign iron and steel mills often use edge heating devices during the rolling process of finishing mills, because the reduction of edge temperature will cause various problems: [0003] - In low carbon steels, once the temperature is below the austenite transformation point, very rapid recrystallization at the edges leads to coarse and brittle ferrite. In microalloyed steels, too low a temperature will produce early precipitation, so that the microalloying elements finally precipitated in the ferrite deviate slightly from the composition in the solid solution. Both cases reduce the mechanical properties of the steel. [0004] - In stainless steels, the temperature drop at the edge also leads to lower plasti...

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Problems solved by technology

Both cases reduce the mechanical properties of the steel

[0010] This method is to reheat the surface of the hot-dip galvanized strip steel to produce qualified spangle products, but it does not have direct inspiration for solving the problem that the edge cracks will continue to extend to the depth of the cracks during the trimming process, especially The secondary heating method on the surface of the strip has high requirements for equipment installation space, and it is not targeted at solving the problem that edge cracks will continue to extend to the depth of cracks during the trimming process, and it cannot meet and realize the transformation of existing production lines. Cannot be directly applied to solve the edge crack problem

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