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Controlled rolling and controlled cooling technique for improving performance of Q235 steel plate

A technology of controlled rolling, controlled cooling, and high performance, applied in the field of metallurgy, can solve the problems of limited cooling speed, long cooling period, and long production cycle of the process, and achieve the effects of reducing rolling energy consumption, reducing production costs, and shortening the production cycle

Inactive Publication Date: 2015-03-11
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The disadvantages of the prior art mainly include: the process production cycle is long
It often takes a period of air cooling or water cooling after rough rolling to finish rolling; in addition, due to laminar cooling, the cooling speed is limited, which also makes the cooling section longer

Method used

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  • Controlled rolling and controlled cooling technique for improving performance of Q235 steel plate
  • Controlled rolling and controlled cooling technique for improving performance of Q235 steel plate
  • Controlled rolling and controlled cooling technique for improving performance of Q235 steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The steel consists of the following components (wt%): C: 0.15%, Si: 0.14%, Mn: 0.38%, P: 0.011%, S: 0.017%, and the rest is Fe and unavoidable impurities.

[0019] (1) smelting and continuous casting into a 115mm thick billet according to the above-mentioned chemical composition weight percentage;

[0020] (2) Billet heating: the heating temperature is 1100°C, and after 1 hour of heat preservation, it is taken out of the furnace to remove the surface oxide scale;

[0021] (3) High temperature rolling: the rolling start temperature is 1050°C; The amount of deformation is 96.5%; and the amount of deformation in a single pass is greater than 10%, and the final rolling temperature is 910°C;

[0022] (4) Ultra-fast cooling immediately after rolling, the cooling rate is 200°C / s; and the final cooling temperature is 530°C, and then air-cooled to room temperature. The optical microstructure of the obtained steel plate is as follows figure 1 As shown, the relevant mechanical ...

Embodiment 2

[0024] The steel consists of the following components (wt%): C: 0.15%, Si: 0.18%, Mn: 0.40%, P: 0.011%, S: 0.017%, and the rest is Fe and unavoidable impurities.

[0025] (1) smelting and continuous casting into a 115mm thick billet according to the above-mentioned chemical composition weight percentage;

[0026] (2) Billet heating: the heating temperature is 1100°C, and after 2 hours of heat preservation, it is taken out of the furnace to remove the surface oxide scale;

[0027] (3) High-temperature rolling: the rolling start temperature is 1000°C; The amount of deformation is 96.5%; and the amount of deformation in a single pass is greater than 10%, and the final rolling temperature is 900°C;

[0028] (4) Ultra-fast cooling immediately after rolling, the cooling rate is 235°C / s; and the final cooling temperature is 500°C, and then air-cooled to room temperature. The scanning electron microscope microstructure of the obtained steel plate is as follows: figure 2 As shown, ...

Embodiment 3

[0030] The steel consists of the following components (wt%): C: 0.16%, Si: 0.30%, Mn: 0.70%, P: 0.011%, S: 0.017%, and the rest is Fe and unavoidable impurities.

[0031] (1) smelting and continuous casting into a 115mm thick billet according to the above-mentioned chemical composition weight percentage;

[0032] (2) Billet heating: the heating temperature is 1100°C, and after 1 hour of heat preservation, it is taken out of the furnace to remove the surface oxide scale;

[0033] (3) High temperature rolling: the rolling start temperature is 1050°C; the reduction schedule is distributed as follows: 115-100-85-70-60-50-40-35-28-22-19, the total deformation is 83.5%; and the single The pass deformation is greater than 10%, and the final rolling temperature is 950°C;

[0034] (4) Ultra-fast cooling immediately after rolling, the cooling rate is 115°C / s; and the final cooling temperature is 580°C, then air-cooled to room temperature. The scanning electron microscope microstructur...

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Abstract

The invention discloses a controlled rolling and controlled cooling technique for improving performance of a Q235 steel plate. The controlled rolling and controlled cooling technique comprises the following steps of: (1) melting the following chemical components by weight percent: 0.10-0.20% of C, less than or equal to 0.30% of Si, 0.30-0.70% of Mn, less than or equal to 0.045% of P, less than or equal to 0.045% of S, and the balance of iron and inevitable impurities, and continuously casting into blanks with 115mm in thickness; (2) heating the blanks at the temperature of 1100 DEG C, and preserving heat for 1-2h; (3) carrying out high-temperature rolling: rolling at the temperature of 1000-1100 DEG C, wherein the total deformation quantity can be guaranteed to be more than 80%, the single deformation quantity is not less than 10%, and the finally rolling temperature is controlled to be 900 DEG C-950 DEG C; and (4) immediately cooling ultra-quickly after being rolled at the cooling speed being more than 100 DEG C / s; controlling the final cooling temperature at 500-600 DEG C, and then carrying out air-cooling to room temperature. According to the controlled rolling and controlled cooling technique, the rolling energy consumption can be greatly reduced, and the production period of the steel can be shortened.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a controlled rolling and controlled cooling process for improving the properties of Q235 steel plates. Background technique [0002] Since the economic crisis, my country's iron and steel industry has become more and more serious about the severe excess capacity of common steel types. Enterprises are also trying their best to achieve reduced production to ensure efficiency. Among them, for traditional steel grades such as Q235, the profit margin itself is very low. Therefore, it is very important to upgrade the product and expand the profit margin of the product through the optimization and improvement of the rolling process and the chemical composition unchanged or fine-tuned. important. In addition, the strength upgrade of the steel type directly brings about the weight reduction effect of the prepared structural parts, which can save the amount of steel used, improve the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/02C22C38/04B21B37/74
Inventor 姚圣杰
Owner HARBIN INST OF TECH AT WEIHAI