Steel easy to pickle and production method of steel

Abstract

The invention discloses steel easy to pickle. The steel comprises, by weight, 0.068-0.097% of C, no more than 0.03% of Si, 0.27%-0.60% of Mn, no more than 0.015% of P, no more than 0.010% of S, 0.028-0.050% 0f Als and no more than 0.005% of N. The production method comprises the steps of conducting molten iron desulphurization; smelting and performing continuous casting to obtain a blank; heating the casting blank; conducting rough rolling; conducting finish rolling; performing laminar cooling; and reeling for use. The method is characterized in that scale on the surface of a steel plate is thin, the content of FeO in the scale is high, the scale on the edge is not too thick, the generation of Fe2O3 is avoided, and a scale structure which is easy to pickle is obtained; a low-temperature short-time heating method and a low-temperature rolling method are used, the disadvantages that the energy consumption is high, the oxidization burning loss is serious, the yield is low, the roll wearing is serious, and the oxidation defect rate is high due to the conventional high-temperature long-time heating and rolling are avoided, the convexity degree of a control panel is no more than 40 mu m, and the uniformity of the scale of the panel surface can be improved.

Description

technical field [0001] The invention relates to a hot-rolled steel plate or steel strip and a production method thereof, in particular to an easy pickling steel and a production method thereof. Background technique [0002] Before the hot-rolled strip is cold-rolled or in other applications that do not require surface scale, it is necessary to remove the scale on the surface of the hot-rolled strip, and then proceed to the next step of deep processing. In the removal method of iron oxide scale, it is generally carried out by pickling. The efficiency of pickling is affected by factors such as the thickness and structure of the oxide scale on the steel surface, the type and concentration of the acid solution, the temperature of the acid solution, and the pickling time. The thinner the iron oxide scale and the more FeO content in the iron oxide scale structure, the more conducive to pickling, and the Fe contained in the iron oxide scale 2 o 3 It is not conducive to pickling....

AI Technical Summary

Problems solved by technology

In the whole steel production process, higher heating temperature and rolling and coiling temperature are adopted. In this production method of high temperature heating and rolling, its negative effects mainly lie in the following aspects: 1) high Heating temperature increases energy consumption; 2) High heating temperature increases metal burning loss and reduces product yield; 3) High rolling temperature is likely to cause surface quality defects of the strip, especially for mild steel, often causing surface pressure. 4) High rolling temperature is likely to cause serious wear of the rolls, which on the one hand increases roll consumption, and on the other hand causes quality defects on the plate surface; 5) High final rolling temperature causes scale thickness on the plate surface increase, resulting in difficulties in subsequent pickling or increased acid consumption