A kind of CSP process easily pickling low-carbon steel plate and its manufacturing method

Abstract

The invention discloses a CSP process easy acid pickling low carbon steel plate and a manufacturing method thereof. The CSP process easy acid pickling low carbon steel plate comprises, by weight, 0.020-0.050% of C, no more than 0.030% of Si, no more than 0.30% of Mn, no more than 0.015% of P, no more than 0.010% of S, 0.020-0.060% of Al, and the balance Fe and unavoidable impurities. The manufacturing comprises the following steps of hot metal pretreatment, converter smelting, argon blowing station treatment, LF furnace refining, CSP continuous casting, heating, high pressure water descaling,hot rolling, laminar cooling, and batching. The steel plate is subjected to reasonable smelting, heating, hot rolling, cooling and batching. According to the manufacturing method, iron scale thicknessof the low carbon steel plate can be reduced significantly, and the FeO ratio of the iron scale can be improved. The acid liquor dosage in the sequential acid picking process can be lowered, the acidpicking time can be reduced, and the production efficiency and yield can be improved.

Description

technical field [0001] The invention relates to the technical field of production technology of thin slab continuous casting and rolling steel, in particular to a low-carbon steel plate which is easy to pickle in a CSP process and a manufacturing method thereof. Background technique [0002] As one of the important varieties in the CSP product structure, low-carbon steel is mainly used as a cold-rolled base material, and the surface oxide scale needs to be removed after pickling. The surface oxide scale of hot-rolled strip steel is generally composed of the outermost layer of Fe 2 o 3 , middle layer Fe 3 o 4 and the innermost FeO composition, where Fe 2 o 3 Most dense, Fe 3 o 4 Secondly, FeO is the loosest; FeO is most easily decomposed by acid reduction, Fe 3 o 4 Second, Fe 2 o 3 The hardest to be decomposed by acid reduction. The thinner the iron oxide scale and the higher the FeO ratio in the oxide scale structure, the more conducive to the improvement of pick...

AI Technical Summary

Problems solved by technology

These methods may not be suitable, or may increase the production cost. At present, there is still no method to reduce the scale of low carbon steel in the CSP process and improve the pickling efficiency without increasing the production cost.

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