Process for producing hot-rolled acid-pickled 610 L automobile frame steel strip with thin gauge and high elongation

A technology of automobile beam steel and production process, which is applied in the field of automobile steel production technology, to achieve the effect of reducing the weight of the whole vehicle, reducing the thickness of the steel plate, and reducing fuel consumption

Active Publication Date: 2013-09-25
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The specific measure is to replace the 510MPa-grade beam steel with a thickness of 3.0mm-5.0mm with 610MPa-grade thin-gauge automobile fra

Method used

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  • Process for producing hot-rolled acid-pickled 610 L automobile frame steel strip with thin gauge and high elongation
  • Process for producing hot-rolled acid-pickled 610 L automobile frame steel strip with thin gauge and high elongation
  • Process for producing hot-rolled acid-pickled 610 L automobile frame steel strip with thin gauge and high elongation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] After converter smelting and LF furnace refining, the chemical composition of 610L hot-rolled automobile frame steel strip is controlled as follows: C: 0.08 wt%, Mn: 1.55 wt%, S: 0.007 wt%, P: 0.019 wt%, Si: 0.09 wt% , Als: 0.026 wt%, Nb: 0.047 wt%, Ti: 0.018 wt%, slab thickness 150mm. The casting slab is heated by a walking heating furnace, and the temperature of the slab coming out of the furnace is ≥1280°C. The heating time is 150 minutes. After 5 passes of rough rolling, the thickness of the intermediate billet after rough rolling is 35-40mm. After being coiled by the hot coil box, the head and tail are reversed to reduce the temperature difference between the head and the tail, and then go through 7 passes of finish rolling. To form a steel strip with a thickness of 2.3mm, the temperature of the finishing rolling is controlled within the range of 1030-1070°C, the temperature of the finish rolling is 840±10°C, the strip is cooled in the laminar cooling line, and the...

Embodiment 2

[0027] After converter smelting and LF furnace refining, the chemical composition of 610L hot-rolled automobile frame steel strip is controlled as follows: C: 0.06wt%, Mn: 1.60wt%, S: 0.005wt%, P: 0.015wt%, Si: 0.06wt% , Als: 0.029 wt%, Nb: 0.047 wt%, Ti: 0.018 wt%, slab thickness 150mm. The casting slab is heated by a walking heating furnace, and the temperature of the slab coming out of the furnace is ≥1280°C. The heating time is 150 minutes. After 5 times of rough rolling, the thickness of the intermediate billet after rough rolling is 35-40mm. After being coiled by the hot coil box, the head and tail are reversed to reduce the temperature difference between the head and the tail, and then 7 times of finish rolling. For steel strips with a thickness of 2.6mm, the temperature for finishing rolling is controlled within the range of 1030-1070°C. The final rolling temperature is 840±10°C, the strip is cooled on the laminar flow cooling line, the opening mode of the cooling wat...

Embodiment 3

[0035]After converter smelting and LF furnace refining, the chemical composition of 610L hot-rolled automobile frame steel strip is controlled as follows: C: 0.07wt%, Mn: 1.50wt%, S: 0.009wt%, P: 0.017wt%, Si: 0.06wt% , Als: 0.022 wt%, Nb: 0.050 wt%, Ti: 0.017 wt%, slab thickness 150mm. The casting slab is heated by a walking heating furnace, and the temperature of the slab coming out of the furnace is ≥1280°C. The heating time is 150 minutes. After 5 times of rough rolling, the thickness of the intermediate billet after rough rolling is 35-40mm. After being coiled by the hot coil box, the head and tail are reversed to reduce the temperature difference between the head and the tail, and then 7 times of finish rolling. For steel strips with a thickness of 3.2mm, the temperature for finishing rolling is controlled within the range of 1030-1070°C. The final rolling temperature is 840±10°C, the strip is cooled on the laminar flow cooling line, the opening mode of the cooling wate...

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Abstract

The invention relates to a process for producing a hot-rolled acid-pickled 610 L automobile frame steel strip with thin gauge and high elongation and belongs to the technical field of production processes of steel for automobiles. According to the technical scheme, the process specifically comprises a hot rolling production process and an acid pickling process of an automobile frame steel strip, wherein the hot rolling process comprises the steps of heating, rolling, cooling and the like; and the acid pickling process comprises the following steps of: performing three-section continuous hydrochloric acid pickling and five-section water rinsing on the automobile frame steel strip on a continuous acid pickling production line so that the acid-pickled automobile frame steel strip with gray or offwhite surface and metallic luster on the surface can be obtained; next, drying the surface of the acid-pickled automobile frame steel strip and electrostatically spraying anti-rust oil on both sides of the steel strip, and then coiling and packing the automobile frame steel strip to obtain the finished product. The thin-gauge 610 L automobile frame steel produced by using the process disclosed by the invention is used for substituting 510 L automobile frame steel, so that the thickness of a used steel plate as well as the weight of the whole automobile and fuel consumption of the automobile are reduced while the strengths of the frame and related parts are improved; and therefore, the hot-rolled acid-pickled 610 L automobile frame steel strip provided by the invention plays an important role in reducing the weight of vehicles such as SUV (Sport Utility Vehicle) vehicle and pickup truck. Besides, the acid-pickled surface has metallic luster and thereby has excellent electrophoretic paint coating performance.

Description

technical field [0001] The invention relates to a production process of a thin-gauge high-elongation hot-rolled pickled 610L automobile frame steel strip, belonging to the technical field of automobile steel production technology. Background technique [0002] Automobile frames are generally composed of crossbeams and longitudinal beams. The longitudinal beams are generally stamped with 510MPa steel strips, and the crossbeams and interior supports are generally stamped with 420MPa steel strips. However, with the development of vehicle lightweight, it is necessary to reduce the weight of the vehicle, especially the weight of the frame. The measure is to replace the thick and low-strength beam steel with thin gauge and high-strength 610MPa beam steel. For example, 510L is generally used in SUV models with girders, but with the demand for lightweight, new models in 2013 require the use of thin-gauge 610MPa girder steel instead of 510MPa girder steel. The specific measure is to...

Claims

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Application Information

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IPC IPC(8): C22C38/00C22C33/04C21D8/02C23G3/02C23G1/08
Inventor 乔治明陈礼斌齐长发刘丽萍陈俊东王云阁马光宗孙利顺汪云辉徐杰冯慧霄
Owner HEBEI IRON AND STEEL
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