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A high-strength hot-rolled steel strip with reduced manganese and improved band structure and its manufacturing method

A technology with banded structure and high strength, which is applied in the fields of metal material manufacturing, iron and steel smelting, and controlled rolling and controlled cooling. It can solve the problems of limited improvement of banded structure, achieve easy production process control, improve cold forming performance, and reduce production costs. low effect

Active Publication Date: 2014-10-22
新余钢铁股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the degree of improvement of the banded structure in the steel is limited; the ideal method is to reduce or eliminate the banded structure in the steel by properly adjusting the chemical composition and reducing the Mn content in the steel

Method used

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  • A high-strength hot-rolled steel strip with reduced manganese and improved band structure and its manufacturing method
  • A high-strength hot-rolled steel strip with reduced manganese and improved band structure and its manufacturing method
  • A high-strength hot-rolled steel strip with reduced manganese and improved band structure and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The specific composition of the slab in this embodiment is by weight percentage: C: 0.14%, Si: 0.15%, Mn: 0.60%, P: 0.015%, S: 0.010%, Ti: 0.06%, Alt: 0.027%, and the rest are Fe and unavoidable impurities, continuous casting slab thickness 230mm.

[0026] The specific production process is carried out according to the following steps:

[0027] 1) Billet heating: heat the billet to 1240-1280°C (the specific temperature is controlled by the computer according to the thickness of the billet and the production rhythm), keep warm for 190 minutes, fully austenitize, and ensure the re-dissolution of micro-alloy elements;

[0028] 2) Rolling in the recrystallization zone: the rolling start temperature in the recrystallization zone is 1180°C, and the final rolling temperature in the recrystallization zone is controlled at 1040°C to obtain an intermediate billet. The reduction rate of each pass in the recrystallization zone is controlled at 25%~40%;

[0029] 3) Rolling in the ...

Embodiment 2

[0036] The specific composition of the cast slab in this embodiment is: C: 0.17%, Si: 0.35%, Mn: 0.55%, P: 0.020%, S: 0.003%, Ti: 0.05%, Alt: 0.020%, and the rest are Fe and unavoidable impurities, continuous casting slab thickness 230mm.

[0037] The specific production process is carried out according to the following steps:

[0038] 1) Billet heating: heat the billet to 1240-1280°C, keep it warm for 180min, and austenitize the components;

[0039] 2) Rolling in the recrystallization zone: the rolling start temperature in the recrystallization zone is 1160°C, and the final rolling temperature in the recrystallization zone is controlled at 1020°C to obtain an intermediate billet. The reduction rate of each pass in the recrystallization zone is controlled at 25%~40%;

[0040] 3) Rolling in the non-recrystallized area: when the intermediate billet is cooled to 930°C, the rolling in the non-recrystallized area is carried out, the final rolling temperature is 850°C, and the cum...

Embodiment 3

[0047] The specific composition of the cast slab in this embodiment is: C: 0.15%, Si: 0.25%, Mn: 0.40%, P: 0.014%, S: 0.004%, Ti: 0.040%, Alt: 0.040%, and the rest are Fe and unavoidable impurities, continuous casting slab thickness 230mm.

[0048] The specific production process is carried out according to the following steps:

[0049] 1) Billet heating: heat the billet to 1240-1280°C, keep it warm for 200min, and austenitize the components;

[0050] 2) Rolling in the recrystallization zone: the rolling start temperature in the recrystallization zone is 1190°C, and the final rolling temperature in the recrystallization zone is controlled at 1050°C to obtain an intermediate billet. The reduction rate of each pass in the recrystallization zone is controlled at 25%~40%;

[0051] 3) Rolling in the non-recrystallized area: when the intermediate billet is cooled to 940°C, the rolling in the non-recrystallized area is carried out, the final rolling temperature is 830°C, and the cu...

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Abstract

The invention discloses a high-strength hot rolled steel strip with improved zonal structure by manganese reduction and a manufacturing method thereof. The high-strength hot rolled steel strip comprises the following chemical components in percentage by weight: 0.14-0.17% of C, 0.15-0.35% of Si, 0.40-0.60% of Mn, at most 0.020% of P, at most 0.010% of S, 0.040-0.060% of Ti and 0.020-0.040% of Alt. The manufacturing method comprises the following steps: 1) smelting and continuous casting: smelting molten steel according to preset components, and casting into a continuous casting blank; 2) rolling: the heating temperature is controlled at 1240-1280 DEG C, the holding time is greater than or equal to 180 minutes, the finishing temperature of the recrystallization zone is greater than or equal to 1020 DEG C, and the finishing temperature of the non-recrystallization zone is controlled at 830-870 DEG C; and 3) cooling after rolling: after carrying out hot rolling on the steel strip, cooling to 560-640 DEG C at the cooling rate of 15-30 DEG C / s, coiling, and cooling to room temperature. The invention has the advantage of simple component design; the reduction of Mn content in steel is combined with technical control to improve the zonal structure of the hot rolled steel strip and ensure the zonal structure grade to be at most Grade 2.0, thereby enhancing the cold forming property; and no noble alloy elements are added, so the production cost is lower.

Description

technical field [0001] The invention relates to the technical field of metal material manufacturing, in particular to the technical field of iron and steel smelting and controlled rolling and controlled cooling, and specifically relates to a high-strength hot-rolled steel strip with reduced manganese and improved band structure and a manufacturing method thereof. Background technique [0002] Hot-rolled steel strip is one of the steel materials with the widest application and the largest amount of consumption in plate and strip products. It is an important steel product and has an important impact on the technological progress and economic benefits of the entire steel industry. The output of hot-rolled steel strips in developed countries accounts for more than 50% of hot-rolled steel products, and they are in a leading position in the international market competition. The output of my country's iron and steel industry has grown rapidly in recent years, but the quantity and q...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C21D8/02
Inventor 吕瑞国赵征志赵和明唐小勇邹锦忠吴洪杨红来刘志芳张延和杨帆惠亚军余小琴陈兴福
Owner 新余钢铁股份有限公司
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