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High-reaming-property hot-rolled acid-washed steel strip and production method thereof

A hot-rolled pickling and production method technology, which is applied in the field of hot-rolled pickled steel strip and its production, can solve the problems of difficult hot-rolled pickled steel strip, difficult to remove, unfavorable strip steel hole expansion performance, etc., and achieve excellent strip The effect of steel surface quality

Active Publication Date: 2015-05-20
SHOUGANG CORPORATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the existing production technology of hot-rolled pickling high-hole expansion steel, it is difficult to obtain a higher hole expansion rate and excellent strip surface quality
For example, when the composition system contains a relatively high content of C and P elements, due to the segregation of more carbides and grain boundaries P, it is not conducive to the hole expansion performance of the strip, and the higher Si content leads to fayalite (2FeO-SiO 2 ) The formation of iron oxide scale is difficult to remove, and it is difficult to obtain hot-rolled pickled strip steel with higher surface quality

Method used

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  • High-reaming-property hot-rolled acid-washed steel strip and production method thereof

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Embodiment 1

[0040] The embodiment of the present invention provides a hot-rolled pickled steel strip with a tensile strength of 540 MPa in a specification of 1.6mm and high hole expansion performance. Its chemical composition is calculated by weight percentage: C: 0.07%, Si: 0.03%, Mn : 0.9%, P: 0.012%, S: 0.004%, Nb: 0.03%, and the rest are Fe and unavoidable impurities.

[0041]Its production methods include: molten iron pretreatment, converter smelting, LF refining, continuous casting, hot rolling, tempering and pickling. Among them, the rough rolling end temperature is controlled at 1040°C, and the finish rolling end temperature is controlled at 860°C; constant-speed rolling is adopted during rough rolling and finish rolling, the rough rolling speed is controlled at 5m / s, and the finish rolling speed is controlled at 10m / s; After rolling, a staged cooling process is adopted. After finishing rolling, the hot-rolled plate is rapidly cooled to 620°C at a cooling rate of 80°C / S, then air...

Embodiment 2

[0044] A hot-rolled pickled steel strip with high hole expansion performance provided by the embodiment of the present invention, its chemical composition is calculated by weight percentage: C: 0.09%, Si: 0.04%, Mn: 1.0%, P: 0.015%, S: 0.001%, Nb: 0.015%, and the balance is Fe and unavoidable impurities.

[0045] Its production methods include: molten iron pretreatment, converter smelting, LF refining, continuous casting, hot rolling, tempering and pickling. Among them, the rough rolling end temperature is controlled at 1000°C, and the finish rolling end temperature is controlled at 840°C; constant-speed rolling is adopted during rough rolling and finish rolling, the rough rolling speed is controlled at 8m / s, and the finish rolling speed is controlled at 11m / s; After rolling, a staged cooling process is adopted. After finishing rolling, the hot-rolled plate is rapidly cooled to 610°C at a cooling rate of 90°C / S, then air-cooled for 6s, and finally water-cooled to 430°C at 80°...

Embodiment 3

[0047] The embodiment of the present invention provides a hot-rolled pickled steel strip with high hole expansion performance, and its chemical composition is calculated by weight percentage: C: 0.06%, Si: 0.01%, Mn: 0.85%, P: 0.01%, S: 0.0008%, Nb: 0.04%, and the balance is Fe and unavoidable impurities.

[0048] Its production methods include: molten iron pretreatment, converter smelting, LF refining, continuous casting, hot rolling, tempering and pickling. Among them, the rough rolling end temperature is controlled at 1020°C, and the finish rolling end temperature is controlled at 850°C; constant-speed rolling is adopted during rough rolling and finish rolling, the rough rolling speed is controlled at 6m / s, and the finish rolling speed is controlled at 9m / s; After rolling, a staged cooling process is adopted. The hot-rolled plate after finishing rolling is rapidly cooled to 670°C at a cooling rate of 68°C / S, then air-cooled for 8s, and finally water-cooled to 480°C at 70°C...

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Abstract

The invention discloses a high-reaming-property hot-rolled acid-washed steel strip which comprises the following components in percentage by chemical mass: 0.05-0.1% of C, at most 0.05% of Si, 0.8-1.2% of Mn, at most 0.02% of P, at most 0.006% of S, 0.01-0.05% of Nb, and the balance of Fe and inevitable impurities. The invention also discloses a method for producing the high-reaming-property hot-rolled acid-washed steel strip. By controlling the chemical components and the technological parameters for rolling and acid washing, the microscopic metallurgical structure of the produced steel strip is ferrite+bainite, wherein the bainite structure accounts for 10-20 vol%. The tensile strength of the steel strip is greater than or equal to 540 MPa, and the reaming rate lambda is greater than or equal to 100%. The steel strip has excellent surface quality.

Description

technical field [0001] The invention relates to the technical field of hot-rolled pickled steel strip production technology, in particular to a hot-rolled pickled steel strip with high hole expansion performance and a production method thereof. Background technique [0002] Hot-rolled pickled product is an intermediate product between cold-rolled and hot-rolled. It has a surface quality close to that of cold-rolled plate while maintaining the mechanical properties of hot-rolled product. It has a wide range of applications and has a good market prospect. Compared with ordinary hot-rolled sheets, hot-rolled pickled sheets remove surface oxide scale and improve the surface quality of steel products. Replacing cold-rolled sheets with pickled sheets can significantly reduce costs for enterprises. It has been widely used in the manufacture of automobile bodies Structural parts, chassis systems, etc. With the development of the automobile industry, the automobile industry has high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12C21D8/02
Inventor 郭子峰郭佳冯军章军周娜孟宪堂白永立李飞陈斌包春林李瑞恒吴科敏李玉鹏关建东王伦王学强宋春华李景庆陈波
Owner SHOUGANG CORPORATION
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