Production method for hot rolling acid pickling automobile plate

A production method, hot-rolled pickling technology, applied in the field of iron and steel smelting, can solve the problem that the uniformity of the surface quality of the pickled automobile plate is difficult to meet the needs of automatic production, so as to reduce the difficulty of laminar cooling control and the performance of the coil. Stable, low-cost effect

Active Publication Date: 2019-07-26
INST OF RES OF IRON & STEEL JIANGSU PROVINCE +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the surface quality, stamping performance and performance uniformity of the pickled automotive sheet are difficult to meet the needs of future automated production of the automotive industry, and need to be continuously optimized

Method used

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  • Production method for hot rolling acid pickling automobile plate
  • Production method for hot rolling acid pickling automobile plate
  • Production method for hot rolling acid pickling automobile plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] In terms of weight percentage, the chemical composition of the billet is: C: 0.032, Si: 0.03, Mn: 0.24, P: 0.014, S: 0.0011, Nb: 0.015, Als: 0.041, N: 0.006, the balance is Fe and unavoidable of impurities. Its production process is: hot metal pre-desulfurization treatment→converter steelmaking→ladle LF refining→continuous casting.

[0056] The molten iron is desulfurized. After desulfurization, the sulfur content is lower than 0.008%, and the end point C of the converter is controlled at 0.01-0.03%. During the refining process, Al and Mn are adjusted in place and Nb alloying is carried out. Continuous casting, crystallizer liquid level fluctuation is controlled within ± 2mm, slab thickness 220 ± 2mm; slab heating → 6 passes rough rolling → 7 passes finish rolling → laminar cooling → coiling → smoothing → pickling → coating Oil → finished product. After the billet is heated at 1220°C for 170 minutes, dephosphorization is carried out with high-pressure water, and the d...

Embodiment 2

[0062] 1) In terms of weight percentage, the chemical composition of the billet is: C: 0.032, Si: 0.02, Mn: 0.26, P: 0.013, S: 0.011, Nb: 0.014, Als: 0.038, N: 0.004, and the balance is Fe and unavoidable impurities. Its production process is: hot metal pre-desulfurization treatment→converter steelmaking→ladle LF refining→continuous casting.

[0063] The molten iron is desulfurized. After desulfurization, the sulfur content is lower than 0.008%, and the end point C of the converter is controlled at 0.01-0.03%. During the refining process, Al and Mn are adjusted in place and Nb alloying is carried out. Continuous casting, crystallizer liquid level fluctuation is controlled within ± 2mm, slab thickness 220 ± 2mm; slab heating → 6 passes rough rolling → 7 passes finish rolling → laminar cooling → coiling → smoothing → pickling → coating Oil → finished product. After the steel billet is heated at 1220°C for 160 minutes, dephosphorization is carried out with high-pressure water, ...

Embodiment 3

[0069] In terms of weight percentage, the chemical composition of the billet is: C: 0.024, Si: 0.04, Mn: 0.25, P: 0.010, S: 0.008, Nb: 0.017, Als: 0.043, N: 0.005, the balance is Fe and unavoidable of impurities. Its production process is: hot metal pre-desulfurization treatment→converter steelmaking→ladle LF refining→continuous casting.

[0070] The molten iron is desulfurized. After desulfurization, the sulfur content is lower than 0.008%, and the end point C of the converter is controlled at 0.01-0.03%. During the refining process, Al and Mn are adjusted in place and Nb alloying is carried out. Continuous casting, crystallizer liquid level fluctuation is controlled within ± 2mm, slab thickness 220 ± 2mm; slab heating → 6 passes rough rolling → 7 passes finish rolling → laminar cooling → coiling → smoothing → pickling → coating Oil → finished product. After the steel billet is heated at 1220°C for 165 minutes, dephosphorization is carried out with high-pressure water, and ...

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Abstract

The invention discloses a production method for a hot rolling acid pickling automobile plate. The hot rolling acid pickling automobile plate comprises chemical elements including, by weight, 0.02-0.04% of C, smaller than or equal to 0.05% of Si, 0.20%-0.30% of Mn, smaller than or equal to 0.020% of P, smaller than or equal to 0.020% of S, 0.010%-0.020% of Nb, 0.030-0.050% of Als, smaller than or equal to 0.008% of N and the balance Fe and inevitable impurities. The preparing method for the hot rolling acid pickling automobile plate sequentially includes the following steps of molten iron pre-desulfuration treatment, converter steelmaking, steel ladle LF refining, continuous casting, casting blank heating, rough rolling, finish rolling, laminar cooling, high-temperature coiling, flattening,acid pickling, rinsing, oil smearing and coiling. By means of the production method for the low-carbon, low-manganese and low-silicon component design is adopted, the carton equivalent is reduced onone hand, and the steel plate welding performance is improved; on the other hand, ferrous silicate which is hardly subjected to acid pickling is prevented from being formed on the surface of a steel plate in the hot rolling process, and the surface quality of the steel plate is improved; a proper amount of Nb alloys are added, so that the strengthening effect of the Nb alloys is sufficiently achieved, and low-cost component design is achieved; and high-temperature coiling is adopted, the laminar cooling control difficulty is lowered, the steel roll through roll technology is stability, and thesteel roll plate shape quality and the through roll performance stability are improved.

Description

technical field [0001] The invention relates to the field of iron and steel smelting, in particular to a production method of a hot-rolled pickled automobile sheet. Background technique [0002] Hot-rolled pickled coils are hot-rolled pickled coils obtained from high-quality hot-rolled coils after uncoiling, pickling, rinsing, drying, trimming and oiling. Hot-rolled pickled sheet is a product with higher cost performance between cold-rolled sheet and hot-rolled sheet. Its surface quality and use requirements are between hot-rolled and cold-rolled sheets, and it is an ideal substitute for some hot-rolled and cold-rolled sheets. Among them, pickling auto sheets are mainly used in the chassis, seats and various structural parts of automobiles. [0003] In 2018, my country's automobile production was 27.968 million, a decrease of 3.8% compared with the previous year, which was the first negative growth in the past ten years. It is expected that the production and sales of aut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/06C21D8/02C23G1/08C23G1/04
CPCC21D8/0226C21D2211/005C22C38/02C22C38/04C22C38/06C22C38/12C23G1/04C23G1/08
Inventor 岳重祥朱阳林李慧赵刚李化龙
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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