Steel easy to pickle and production method of steel

A technology that is easy to pickle and desulfurize molten iron is applied to hot-rolled steel sheets or strips and their production fields. It can solve problems such as increased thickness of scale on the plate surface, defects of scale pressed into the surface of the plate, and surface quality defects of the strip. Effects of defect reduction, residual strain reduction, and wear reduction

Inactive Publication Date: 2015-01-07
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] An easy pickling steel, its chemical composition and weight percentage are: C: 0.068%, Si: 0.028%, Mn: 0.36%, P: 0.013%, S: 0.009%, Als: 0.028%, N: 0.005% , the balance is Fe and unavoidable inclusions.

[0032] Its production steps:

[0033] 1) Desulfurization by molten iron;

[0034] 2) Converter smelting and continuous casting into billets;

[0035] 3) Heating the slab, the furnace temperature is 100~200℃, the heating time is 198min, and the heating temperature is 1000~1030℃;

[0036] 4) Carry out rough rolling, the final rolling temperature of rough rolling is 950~970°C, the total reduction rate in the rough rolling stage is 82%, and high pressure water is used to descale twice during the rough rolling process, and the surface of the steel plate is scale-free;

[0037] 5) Carry out finish rolling, the start rolling temperature of finish rolling is 900~920°C, the finish rolling temperature is 800~820°C, the total reduction ratio of finish rolling is 91%; The roll...

Embodiment 2

[0043] An easy pickling steel, its chemical composition and weight percentage are: C: 0.073%, Si: 0.025%, Mn: 0.27%, P: 0.012%, S: 0.0085%, Als: 0.033%, N: 0.004% , the balance is Fe and unavoidable inclusions.

[0044] Its production steps:

[0045] 1) Desulfurization by molten iron;

[0046] 2) Converter smelting and continuous casting into billets;

[0047] 3) Heating the slab, the furnace temperature is 210~220℃, the heating time is 165min, and the heating temperature is 1060~1080℃;

[0048] 4) Carry out rough rolling, the final rolling temperature of rough rolling is 965~985°C, the total reduction rate in the rough rolling stage is 84%, and the scale is descaled by high-pressure water for 3 times during the rough rolling process, and the surface of the steel plate is scale-free;

[0049] 5) Carry out finish rolling, the start rolling temperature of finish rolling is 925~935°C, the finish rolling temperature is 815~835°C, the total reduction ratio of finish rolling is 9...

Embodiment 3

[0055] An easy pickling steel, its chemical composition and weight percentage are: C: 0.097%, Si: 0.021%, Mn: 0.46%, P: 0.013%, S: 0.0095%, Als: 0.041%, N: 0.0035% , the balance is Fe and unavoidable inclusions.

[0056] Its production steps:

[0057] 1) Desulfurization by molten iron;

[0058] 2) Converter smelting and continuous casting into billets;

[0059] 3) Heating the slab, the furnace temperature is 500~510℃, the heating time is 120min, and the heating temperature is 1120~1130℃;

[0060] 4) Carry out rough rolling, the finishing temperature of rough rolling is 1030~1040°C, the total reduction rate in the rough rolling stage is 83%, and high pressure water is used to descale twice during the rough rolling process, and the surface of the steel plate has no scale;

[0061] 5) Carry out finish rolling, the start rolling temperature of finish rolling is 955~975°C, the finish rolling temperature is 855~860°C, the total reduction ratio of finish rolling is 95%; The rolli...

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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....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C33/04C21D8/02
Inventor 谭文韩斌蒋扬虎杨奕汪水泽刘洋魏兵汪荣
Owner 武汉钢铁有限公司
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