Production method for rolling production of thin-gauge low-carbon steel from ferrite on CSP production line

Abstract

The invention relates to a production method for rolling production of thin-gauge low-carbon steel from ferrite on a CSP production line. The production method comprises the five steps of soaking, dephosphorization, finish rolling, coiling and insulation cover slow cooling. In the absence of equipment of a rough rolling rack and an intermediate water cooling device, production of a thin-gauge high-precision hot-rolled product of 1.0-2.0 mm is achieved; product properties are that the yield strength is 180-280 MPa, the tensile strength is 300-380 MPa, the elongation is larger than or equal to 38%, the yield ratio is 0.55-0.75, and the thickness tolerance is controlled to be within the range of + / - 30 [mu]m; and the properties and the thickness precision reach the level of a cold-rolled product of the same gauge, and 'cold-rolling replaced with hot-rolling' can be achieved.

Description

technical field [0001] The invention relates to the technical field of strip steel production, in particular to a production method for producing thin-gauge low-carbon steel by adopting ferrite rolling in a CSP production line. Background technique [0002] CSP is a thin slab continuous casting and rolling technology researched and developed by German SMS, called compact strip steel production technology. The typical process flow of CSP is: (electric furnace or) converter → ladle refining furnace → thin slab continuous caster → soaking furnace → hot continuous rolling mill → laminar cooling → underground coiling. The thickness of the slab drawn from the continuous casting slab is less than 70 mm, and it is rolled into a strip steel of 0.8 to 12.5 mm through 4 to 7 finishing mills. [0003] Ferritic rolling was first developed by the Belgian Iron and Steel Research Center in the late 1980s. It can be used to produce a cheap, soft, non-aging steel that can be used directly or...

AI Technical Summary

Problems solved by technology

For the thin slab continuous casting and rolling production line, when the traditional austenitic rolling is used to produce low carbon steel, due to the high pass reduction rate and the fine grain of the product, the yield strength is high, the yield strength ratio is high, and the formability is relatively low. Difference

Although thin slab continuous casting and rolling has the advantages of producing thin-gauge products, the yield strength and yield strength ratio of thin-gauge low-carbon steel are higher than those of cold-rolled products of the same specification, and the formability is poor, which limits its ability to "replace cold with heat"

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