Thin strip steel for thin-wall oil drum and manufacturing method of thin strip steel

Abstract

The invention discloses a thin strip steel for a thin-wall oil drum and a manufacturing method of the thin strip steel. Double-roll thin strip continuous production is adopted; a dry ice spray mode is adopted after a cast strip is discharged from a crystallization roll; uniform enhanced cooling is performed on the cast strip; the cast strip is quickly cooled to be below 1,280 DEG C; the cooling rate is 200-300 DEG C / s; in such a cooling mode, separation of coarse BN (Boron Nitride) can be promoted and low-melting-point phase B2O3 and fine AlN (Aluminum Nitride) separation are prevented to fulfill the aims of uniformizing austenite crystal grains and reducing the yield ratio; and then austenite is recrystallized and rolled on line, and the strip steel which is subjected to hot rolling is cooled through anti-oxidation quick cooling, wherein the cooling rate is 80-200 DEG C / s and the coiling temperature is 500-600 DEG C. Through the invention, the thin strip steel for the thin-wall oil drum with low yield ratio and superior impact performance can be obtained. According to the thin strip steel for the thin-wall oil drum produced by the method, the hot thin strip steel can be directly used in place of a cold one, a cold rolling step is removed, and the production cost is greatly reduced.

Description

technical field [0001] The invention relates to a continuous casting process, in particular to a thin steel strip for thin-walled oil barrels and a manufacturing method thereof. Background technique [0002] In the traditional steel production process, tin (Sn) is a typical residual element or harmful element in steel. It is very difficult and expensive to fully remove Sn in the steelmaking process. Once Sn is contained in steel, it is basically impossible to completely eliminate it. , can only reduce the content of Sn by diluting molten steel, all of which lead to the increase of the cost of steel products. [0003] In recent years, due to the continuous recycling of scrap steel, the content of residual elements such as Sn in steel has gradually increased. Sn in steel is an element that is easy to segregate, and it is easy to be enriched at the grain boundary to cause defects such as cracks. Therefore, in the traditional process The content of Sn element in steel is strict...

AI Technical Summary

Problems solved by technology

When thin strip continuous casting produces this kind of steel, it can solve the problems of uneven structure, low elongation, high yield strength ratio and poor formability in the thin strip continuous casting process, and meets the needs of bending forming and stamping forming. and other use requirements, so as to meet the use requirements of cold-rolled base materials and "replacing cold with heat" products

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