Hot rolling acid pickling strip steel with high chambering performance 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, unfavorable strip steel hole expansion performance, difficult to remove, etc., and achieve excellent strip The effect of steel surface quality

Active Publication Date: 2018-12-14
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
[0006] S element is a harmful element, and the inclusion MnS produced by it seriously affects the hole expansion rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 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 0.07%, Si 0.3%, Mn 1.2%, P 0.012%, S 0.012%, Nb 0.03%, Al 0.05%, RE 0.05%, the rest is Fe and unavoidable impurities.

[0044] Its production methods include: molten iron pretreatment, converter smelting, 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-cooled for 7s, and finally water-cooled to 410°C at ...

Embodiment 2

[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 0.09%, Si 0.3%, Mn 1.5%, P 0.015%, S 0.015%, Nb 0.015%, Al 0.04%, RE 0.002%, the rest is Fe and unavoidable impurities.

[0048] Its production methods include: molten iron pretreatment, converter smelting, 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 a...

Embodiment 3

[0051] 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 0.6%, Mn 1.2%, P 0.01%, S 0.015%, Nb 0.04%, Al 0.03%, RE 0.02%, the rest is Fe and unavoidable impurities.

[0052] Its production methods include: molten iron pretreatment, converter smelting, 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°...

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Abstract

The invention discloses hot rolling acid pickling strip steel with high chambering performance and a production method thereof. The hot rolling acid pickling strip steel is made from raw material chemical components including, by mass, 0.05%-0.1% of C, 0.1%-0.7% of Si, 0.9%-1.6% of Mn, not larger than 0.02% of P, not larger than 0.015% of S, 0.01%-0.05% of Nb, 0.01%-0.07% of Al, 0.002%-0.05% of REand the balance Fe and inescapable impurities. The production method of the hot rolling acid pickling strip steel with the high chambering performance comprises the steps of pretreatment of hot metal, converter smelting, refining, continuous casting, hot rolling, smoothening and acid pickling. The microscopic metallographic structure of the strip steel produced through the production method is ferrite+bainite, the volume ratio of the bainite structure occupies 10%-20%, the strength of extension of the strip steel is higher than or equal to 590 MPa, the chambering rate lambda is higher than orequal to 95%, and the excellent strip steel surface quality is achieved.

Description

technical field [0001] The invention relates to a low-cost hot-rolled pickled steel strip with high hole expansion performance and a production method thereof, belonging to the technical field of hot-rolled pickled steel strip production technology. 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/12C22C38/06C21D8/02
CPCC21D8/0205C21D8/0226C21D2211/005C22C38/005C22C38/02C22C38/04C22C38/06C22C38/12
Inventor 郭子峰郭佳张李秋寒王智权冯军陈斌李玉鹏吕宝锋赵青尼兴周娜刘文鑫徐伟王淑志武巧玲张嘉琪王学强宋春华陈波
Owner SHOUGANG CORPORATION
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