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Production method of high-quality thick steel plate

A production method and thick-gauge technology, applied in the field of iron and steel materials, can solve the problems of low rolling rhythm and low efficiency of high-strength toughness steel plate

Active Publication Date: 2019-02-01
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a production method of high-quality thick-gauge steel plates, which solves the technical problem of low rolling rhythm and low efficiency in the production of thick-gauge, high-strength toughness steel plates in the prior art.

Method used

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  • Production method of high-quality thick steel plate
  • Production method of high-quality thick steel plate
  • Production method of high-quality thick steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Described production method specifically comprises:

[0069] Smelting: Converter smelting, top blowing or top-bottom composite blowing, LF furnace and RH furnace vacuum treatment to reduce the content of O, H and other harmful gases and S;

[0070] Continuous casting: the thickness of the continuous casting slab is 400mm, the compression ratio is 5.7, the width of the continuous casting slab is 2000mm, the width ratio is 1.2, and the cumulative reduction of the longitudinal rolling passes is 263mm;

[0071] Heating system: heat the billet to 1180°C, the total time in the furnace is 390min, and the tapping temperature is 1176°C;

[0072] Rough rolling stage: Low-speed and high-reduction process is adopted, the rolling start temperature is 1120°C, the cumulative reduction rate is 57.5%, the maximum single-pass reduction rate is 15.7%, and the thickness of one-time waiting temperature is 170mm;

[0073] The first stage of finishing rolling: low-speed and high-reduction pr...

Embodiment 2

[0089] Described production method specifically comprises:

[0090] Smelting: Converter smelting, top blowing or top-bottom composite blowing, LF furnace and RH furnace vacuum treatment to reduce the content of O, H and other harmful gases and S;

[0091] Continuous casting: the thickness is 400mm, the compression ratio is 4.44, the width is 2400mm, the expansion ratio is 1.17; the cumulative reduction of longitudinal rolling passes is 253mm;

[0092] Heating system: heat the billet to 1180°C, the total time in the furnace is 390min, and the tapping temperature is 1178°C;

[0093] Rough rolling stage: low-speed and high-reduction process is adopted, the rolling start temperature is 1120°C, the cumulative reduction rate is 50%, the maximum single-pass reduction rate is 17.0%, and the thickness of one-time waiting temperature is 200mm;

[0094] The first stage of finishing rolling: low-speed and high-reduction process is adopted, the rolling start temperature is 890°C, the cumu...

Embodiment 3

[0102] Described production method specifically comprises:

[0103] Smelting: Converter smelting, top blowing or top-bottom composite blowing, LF furnace and RH furnace vacuum treatment to reduce the content of O, H and other harmful gases and S;

[0104] Continuous casting: the thickness is 400mm, the compression ratio is 3.33; the width is 2400mm, without widening; the cumulative reduction of longitudinal rolling passes is 280mm;

[0105] Heating system: heat the billet to 1180°C, the total time in the furnace is 398min, and the tapping temperature is 1176°C;

[0106] Rough rolling stage: Low-speed and large-reduction process is adopted, the rolling start temperature is 1120°C, the cumulative reduction rate is 45%, the maximum single-pass reduction rate is 16.9%, and the thickness of one-time waiting temperature is 220mm;

[0107] The first stage of finishing rolling: low-speed and high-reduction process is adopted, the rolling start temperature is 890°C, the cumulative red...

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Abstract

The invention belongs to the technical field of steel materials, and discloses a production method of a high-quality thick steel plate. The production method comprises the steps that the procedure ofhigh-temperature rolling and the procedure of low-temperature rolling are conducted in a non-recrystallization area in the rolling process, wherein the procedure of high-temperature rolling comprise afirst finish rolling stage, and in the first finish rolling state, a low-speed high-pressure rolling process is adopted, the initial rolling temperature is 900-930 DEG C, a required cumulative rolling rate is equal to or greater than 15%, and the maximum single-pass rolling rate is equal to or greater than 12%; the procedure of low-temperature rolling comprises a second finish rolling stage, andin the second finish rolling stage, a low-temperature high-pressure rolling process is adopted, the initial rolling temperature of a steel plate is 780-820 DEG C, and the finish rolling temperature is760-780 DEG C; and steel is discharged after being rolled and then rapidly enters water to be cooled. By adoption of the production method of the high-quality thick steel plate, the performance of the high-strength and high-tenacity thick steel plate produced through a continuously cast plate is improved, and meanwhile, the technical problems of slow rolling rhythm and low efficiency are solved.

Description

technical field [0001] The invention relates to the technical field of iron and steel materials, in particular to a production method of high-quality thick-gauge steel plates. Background technique [0002] With the advancement of steel production technology, the steel plate delivered in TMCP state has gradually replaced the steel plate delivered in normalizing state due to its better weldability and comprehensive performance. For large-thickness steel plates, the strength and toughness matching of the core of TMCP and the uniformity of performance in the entire thickness direction have become difficulties in its production process. The traditional process is aimed at emphasizing the refinement of austenite grains by rolling the steel plate in the recrystallization zone, rolling in the non-recrystallization zone with an appropriate temperature control thickness, and supplemented by an appropriate water cooling process to ensure the performance of the steel plate. However, wi...

Claims

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Application Information

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IPC IPC(8): C21D8/02C22C38/02C22C38/04C22C38/42C22C38/44C22C38/48C22C38/50
CPCC21D8/0205C21D8/0226C21D8/0263C22C38/02C22C38/04C22C38/42C22C38/44C22C38/48C22C38/50
Inventor 黄乐庆狄国标李群王彦锋杨永达马长文白学军马龙腾王小勇沈钦义韩承良田鹏
Owner SHOUGANG CORPORATION
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