Method for manufacturing cold rolling non oriented electrical steel through continuous casting and tandem rolling sheet bar

Abstract

The method for producing cold-rolled non-oriented electrical steel by using sheet bar and adopting continuous casting and continuous rolling process includes the following steps: a). utilizing the following components: C is less than or equal to 0.005%, Si is less than or equal to 3.5%, Mn is less than or equal to 1.5%, Al is less than or equal to 1.5%, P is less than or equal to 0.2%, S is less than or equal to 0.010%, N is less than or equal to 0.005%, O is less than or equal to 0.02% and the rest is iron and smelting; b). continuous casting, continuously casting molten steel to obtain sheet bar; c). heating, the temperature of sheet bar before which is fed into the furnace is 700-900deg.C, retaining said temperature for 30s-5min; heating sheet bar in ferrite phase area and heating temperature is less than or equal to 1120deg.C; d). hot-rolling, rolling in ferrite phase area, final rolling temperature is 800deg.C-950deg.C; e). coiling, coiling temperature is 500deg.C-900deg.C; and f). normalizing treatment or non-annealing treatment, acid-pickling, first cold-rolling or secondary cold-rolling with intermediate annealing to target thickness, then making final annealing so as to obtain the invented product.

Description

technical field

[0001] The invention relates to a method for manufacturing non-oriented electrical steel, in particular to a method for producing cold-rolled non-oriented electrical steel products with good magnetic properties and low cost by continuous casting and rolling of thin slabs. Background technique

[0002] The traditional continuous casting-hot rolling production line is a kind of steel product used by most steel plants, including the production method of cold-rolled non-oriented electrical steel products, which is characterized by good tolerance of production varieties and large output (a modernized The annual output of traditional hot rolling production lines can reach 3 million tons to 4 million tons).

[0003] The traditional continuous casting to produce non-oriented silicon steel is carried out under the conditions of continuous casting casting speed of 0.8-1.5m / min and casting slab thickness of 210mm-250mm. According to the design of this process, the foll...